# JSON RPC API

### Pchain JSON RPC API

[JSON](http://json.org/) is a lightweight data-interchange format. It can represent numbers, strings, ordered sequences of values, and collections of name/value pairs. [JSON RPC](http://www.jsonrpc.org/specification) is a stateless, light-weight remote procedure call (RPC) protocol. Primarily this specification defines several data structures and the rules around their processing. It is transport agnostic in that the concepts can be used within the same process, over sockets, over HTTP, or in many various message passing environments. It uses JSON ([RFC 4627](http://www.ietf.org/rfc/rfc4627.txt)) as data format.

### JavaScript API

To talk to a pchain node from inside a JavaScript application, use the [pweb3](https://pliangroup.gitbook.io/plian/master/for-developers/pweb3) library, which gives a convenient interface for the RPC methods. See the [JavaScript API](https://pliangroup.gitbook.io/plian/master/for-developers/pweb3) for more.

### Java API

To talk to a pchain node from inside a Java application use the [pweb3j](https://github.com/pchain-org/pweb3j) library.

### JSON RPC URL

Default JSON RPC URL

| Chain Name | Chain Id        | Default Datadir Directory             |
| ---------- | --------------- | ------------------------------------- |
| Main Chain | pchain          | <http://localhost:6969/pchain>        |
| Subchain 1 | child\_0        | <http://localhost:6969/child_0>       |
| Your Chain | your\_chain\_id | <http://localhost:6969/your_chain_id> |

### How To Open RPC

You can start pchain with flag –rpc

```
pchain --rpc
```

After this, if you want to check the main chain’s current block number, the command will look like this:

```
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' localhost:6969/pchain
```

Or if you want to check the subchain’s current block number, the command will look like this:

```
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' localhost:6969/child_0
```

You can also send requests by [Postman](https://www.getpostman.com/), you will need to start pchain with the flag “–rpc –rpcaddr=0.0.0.0”. Be aware, opening your RPC to remote hosts is very dangerous if you keep your account information on your node.

## Reference

### **Pchain Utility RPC**

* [web3\_clientVersion](#web-3-_clientversion)
* [web3\_sha3](#web-3-_sha3)
* [net\_version](#net_version)
* [net\_peerCount](#net_peercount)
* [net\_listening](#net_listening)
* [eth\_protocolVersion](#eth_protocolversion)
* [eth\_syncing](#eth_syncing)
* [eth\_coinbase](#eth_coinbase)
* [eth\_mining](#eth_mining)
* [eth\_hashrate](#eth_hashrate)
* [eth\_gasPrice](#eth_gasprice)
* [eth\_accounts](#eth_accounts)
* [eth\_blockNumber](#eth_blocknumber)
* [eth\_getBalance](#eth_getbalance)
* [eth\_getStorageAt](#eth_getstorageat)
* [eth\_getTransactionCount](#eth_gettransactioncount)
* [eth\_getBlockTransactionCountByHash](#eth_getblocktransactioncountbyhash)
* [eth\_getBlockTransactionCountByNumber](#eth_getblocktransactioncountbynumber)
* [eth\_getUncleCountByBlockHash](#eth_getunclecountbyblockhash)
* [eth\_getUncleCountByBlockNumber](#eth_getunclecountbyblocknumber)
* [eth\_getCode](#eth_getcode)
* [eth\_sign](#eth_sign)
* [eth\_sendTransaction](#eth_sendtransaction)
* [eth\_sendRawTransaction](#eth_sendrawtransaction)
* [eth\_call](#eth_call)
* [eth\_estimateGas](#eth_estimategas)
* [eth\_getBlockByHash](#eth_getblockbyhash)
* [eth\_getBlockByNumber](#eth_getblockbynumber)
* [eth\_getTransactionByHash](#eth_gettransactionbyhash)
* [eth\_getTransactionByBlockHashAndIndex](#eth_gettransactionbyblockhashandindex)
* [eth\_getTransactionByBlockNumberAndIndex](#eth_gettransactionbyblocknumberandindex)
* [eth\_getTransactionReceipt](#eth_gettransactionreceipt)
* [eth\_getUncleByBlockHashAndIndex](#eth_getunclebyblockhashandindex)
* [eth\_getUncleByBlockNumberAndIndex](#eth_getunclebyblocknumberandindex)
* [eth\_getCompilers](#eth_getcompilers-deprecated)
* [eth\_compileLLL](#eth_compilelll-deprecated)
* [eth\_compileSolidity](#eth_compilesolidity-deprecated)
* [eth\_compileSerpent](#eth_compileserpent-deprecated)
* [eth\_newFilter](#eth_newfilter)
* [eth\_newBlockFilter](#eth_newblockfilter)
* [eth\_newPendingTransactionFilter](#eth_newpendingtransactionfilter)
* [eth\_uninstallFilter](#eth_uninstallfilter)
* [eth\_getFilterChanges](#eth_getfilterchanges)
* [eth\_getFilterLogs](#eth_getfilterlogs)
* [eth\_getLogs](#eth_getlogs)
* [eth\_getWork](#eth_getwork)
* [eth\_submitWork](#eth_submitwork)
* [eth\_submitHashrate](#eth_submithashrate)
* [eth\_getProof](#eth_getproof)
* [db\_putString](#db_putstring)
* [db\_getString](#db_getstring)
* [db\_putHex](#db_puthex)
* [db\_getHex](#db_gethex)
* [eth\_getFullBalance](#eth_getfullbalance)

### **Chain RPC**

* [chain\_createChildChain](#chain_createchildchain)
* [chain\_joinChildChain](#chain_joinchildchain)
* [chain\_depositInMainChain](#chain_depositinmainchain)
* [chain\_depositInChildChain](#chain_depositinchildchain)
* [chain\_withdrawFromChildChain](#chain_withdrawfromchildchain)
* [chain\_withdrawFromMainChain](#chain_withdrawfrommainchain)
* [chain\_signAddress](#chain_signaddress)
* [chain\_setBlockReward](#chain_setblockreward)
* [chain\_getBlockReward](#chain_getblockreward)
* [chain\_getAllChains](#chain_getallchains)

### **Epoch RPC**

* [tdm\_voteNextEpoch](#tdm_votenextepoch)
* [tdm\_revealVote](#tdm_revealvote)
* [tdm\_getCurrentEpochNumber](#tdm_getcurrentepochnumber)
* [tdm\_getEpoch](#tdm_getepoch)
* [tdm\_getNextEpochVote](#tdm_getnextepochvote)
* [tdm\_getNextEpochValidators](#tdm_getnextepochvalidators)
* [tdm\_generatePrivateValidator](#tdm_generateprivatevalidator)

### **Delegation RPC**

* [del\_delegate](#del_delegate)
* [del\_cancelDelegate](#del_canceldelegate)
* [del\_applyCandidate](#del_applycandidate)
* [del\_cancelCandidate](#del_cancelcandidate)
* [del\_checkCandidate](#del_checkcandidate)
* [del\_extractReward](#del_extractreward)

## Library

### **web3\_clientVersion**

Returns the latest software version

**Parameters**

none

**Returns**

`String` - The current client version.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"web3_clientVersion","params":[],"id":67}'

// Result
{
  "id":67,
  "jsonrpc":"2.0",
  "result": "Mist/v0.9.3/darwin/go1.4.1"
}
```

### **web3\_sha3**

Returns Keccak-256 (*not* the standardized SHA3-256) of the given data.

**Parameters**

1. `DATA` - the data to convert into a SHA3 hash.

```
params: [
  "0x68656c6c6f20776f726c64"
]
```

**Returns**

`DATA` - The SHA3 result of the given string.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"web3_sha3","params":["0x68656c6c6f20776f726c64"],"id":64}'

// Result
{
  "id":64,
  "jsonrpc": "2.0",
  "result": "0x47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad"
}
```

### **net\_version**

Returns the current network id.

**Parameters**

none

**Returns**

`String` - The current network id.

* `"1"`: Pchain Mainnet
* `"2"`: Testnet

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"net_version","params":[],"id":67}'

// Result
{
  "id":67,
  "jsonrpc": "2.0",
  "result": "3"
}
```

### **net\_listening**

Returns `true` if client is actively listening for network connections.

**Parameters**

none

**Returns**

`Boolean` - `true` when listening, otherwise `false`.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"net_listening","params":[],"id":67}'

// Result
{
  "id":67,
  "jsonrpc":"2.0",
  "result":true
}
```

### **net\_peerCount**

Returns number of peers currently connected to the client.

**Parameters**

none

**Returns**

`QUANTITY` - integer of the number of connected peers.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"net_peerCount","params":[],"id":74}'

// Result
{
  "id":74,
  "jsonrpc": "2.0",
  "result": "0x2" // 2
}
```

### **eth\_protocolVersion**

Returns the current pchain protocol version.

**Parameters**

none

**Returns**

`String` - The current pchain protocol version.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_protocolVersion","params":[],"id":67}'

// Result
{
  "id":67,
  "jsonrpc": "2.0",
  "result": "54"
}
```

### **eth\_syncing**

Returns an object with data about the sync status or `false`.

**Parameters**

none

**Returns**

`Object|Boolean`, An object with sync status data or `FALSE`, when not syncing:

* `startingBlock`: `QUANTITY` - The block at which the import started (will only be reset, after the sync reached his head)
* `currentBlock`: `QUANTITY` - The current block, same as eth\_blockNumber
* `highestBlock`: `QUANTITY` - The estimated highest block

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": {
    startingBlock: '0x384',
    currentBlock: '0x386',
    highestBlock: '0x454'
  }
}
// Or when not syncing
{
  "id":1,
  "jsonrpc": "2.0",
  "result": false
}
```

### **eth\_coinbase**

Returns the client coinbase address.

**Parameters**

none

**Returns**

`DATA`, 20 bytes - the current coinbase address.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_coinbase","params":[],"id":64}'

// Result
{
  "id":64,
  "jsonrpc": "2.0",
  "result": "0xc94770007dda54cF92009BFF0dE90c06F603a09f"
}
```

### **eth\_mining**

Returns `true` if client is actively mining new blocks.

**Parameters**

none

**Returns**

`Boolean` - returns `true` of the client is mining, otherwise `false`.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_mining","params":[],"id":71}'

// Result
{
  "id":71,
  "jsonrpc": "2.0",
  "result": true
}
```

### **eth\_hashrate**

Returns the number of hashes per second that the node is mining with.

**Parameters**

none

**Returns**

`QUANTITY` - number of hashes per second.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_hashrate","params":[],"id":71}'

// Result
{
  "id":71,
  "jsonrpc": "2.0",
  "result": "0x38a"
}
```

### **eth\_gasPrice**

Returns the current price per gas in wei.

**Parameters**

none

**Returns**

`QUANTITY` - integer of the current gas price in wei.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_gasPrice","params":[],"id":73}'

// Result
{
  "id":73,
  "jsonrpc": "2.0",
  "result": "0x09184e72a000" // 10000000000000
}
```

### **eth\_accounts**

Returns a list of addresses owned by client.

**Parameters**

none

**Returns**

`Array of DATA`, 20 Bytes - addresses owned by the client.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_accounts","params":[],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": ["0xc94770007dda54cF92009BFF0dE90c06F603a09f"]
}
```

### **eth\_blockNumber**

Returns the number of most recent block.

**Parameters**

none

**Returns**

`QUANTITY` - integer of the current block number the client is on.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

// Result
{
  "id":83,
  "jsonrpc": "2.0",
  "result": "0xc94" // 1207
}
```

### **eth\_getBalance**

Returns the balance of the account of given address.

**Parameters**

1. `DATA`, 20 Bytes - address to check for balance.
2. `QUANTITY|TAG` - integer block number, or the string `"latest"`, `"earliest"` or `"pending"`, see the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter)

```
params: [
   '0xc94770007dda54cF92009BFF0dE90c06F603a09f',
   'latest'
]
```

**Returns**

`QUANTITY` - integer of the current balance in wei.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBalance","params":["0xc94770007dda54cF92009BFF0dE90c06F603a09f", "latest"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x0234c8a3397aab58" // 158972490234375000
}
```

### **eth\_getStorageAt**

Returns the value from a storage position at a given address.

**Parameters**

1. `DATA`, 20 Bytes - address of the storage.
2. `QUANTITY` - integer of the position in the storage.
3. `QUANTITY|TAG` - integer block number, or the string `"latest"`, `"earliest"` or `"pending"`, see the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter)

**Returns**

`DATA` - the value at this storage position.

**Example**

Calculating the correct position depends on the storage to retrieve. Consider the following contract deployed at `0x295a70b2de5e3953354a6a8344e616ed314d7251` by address `0x391694e7e0b0cce554cb130d723a9d27458f9298`.

```
contract Storage {
    uint pos0;
    mapping(address => uint) pos1;
    
    function Storage() {
        pos0 = 1234;
        pos1[msg.sender] = 5678;
    }
}
```

Retrieving the value of pos0 is straight forward:

```
curl -X POST --data '{"jsonrpc":"2.0", "method": "eth_getStorageAt", "params": ["0x295a70b2de5e3953354a6a8344e616ed314d7251", "0x0", "latest"], "id": 1}' localhost:8545

{"jsonrpc":"2.0","id":1,"result":"0x00000000000000000000000000000000000000000000000000000000000004d2"}
```

Retrieving an element of the map is harder. The position of an element in the map is calculated with:

```
keccack(LeftPad32(key, 0), LeftPad32(map position, 0))
```

This means to retrieve the storage on pos1\["0x391694e7e0b0cce554cb130d723a9d27458f9298"] we need to calculate the position with:

```
keccak(decodeHex("000000000000000000000000391694e7e0b0cce554cb130d723a9d27458f9298" + "0000000000000000000000000000000000000000000000000000000000000001"))
```

The geth console which comes with the web3 library can be used to make the calculation:

```
> var key = "000000000000000000000000391694e7e0b0cce554cb130d723a9d27458f9298" + "0000000000000000000000000000000000000000000000000000000000000001"
undefined
> web3.sha3(key, {"encoding": "hex"})
"0x6661e9d6d8b923d5bbaab1b96e1dd51ff6ea2a93520fdc9eb75d059238b8c5e9"
```

Now to fetch the storage:

```
curl -X POST --data '{"jsonrpc":"2.0", "method": "eth_getStorageAt", "params": ["0x295a70b2de5e3953354a6a8344e616ed314d7251", "0x6661e9d6d8b923d5bbaab1b96e1dd51ff6ea2a93520fdc9eb75d059238b8c5e9", "latest"], "id": 1}' localhost:8545

{"jsonrpc":"2.0","id":1,"result":"0x000000000000000000000000000000000000000000000000000000000000162e"}
```

### **eth\_getTransactionCount**

Returns the number of transactions *sent* from an address.

**Parameters**

1. `DATA`, 20 Bytes - address.
2. `QUANTITY|TAG` - integer block number, or the string `"latest"`, `"earliest"` or `"pending"`, see the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter)

```
params: [
   '0xc94770007dda54cF92009BFF0dE90c06F603a09f',
   'latest' // state at the latest block
]
```

**Returns**

`QUANTITY` - integer of the number of transactions send from this address.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionCount","params":["0xc94770007dda54cF92009BFF0dE90c06F603a09f","latest"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x1" // 1
}
```

### **eth\_getBlockTransactionCountByHash**

Returns the number of transactions in a block from a block matching the given block hash.

**Parameters**

1. `DATA`, 32 Bytes - hash of a block.

```
params: [
   '0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238'
]
```

**Returns**

`QUANTITY` - integer of the number of transactions in this block.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockTransactionCountByHash","params":["0xc94770007dda54cF92009BFF0dE90c06F603a09f"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xc" // 11
}
```

### **eth\_getBlockTransactionCountByNumber**

Returns the number of transactions in a block matching the given block number.

**Parameters**

1. `QUANTITY|TAG` - integer of a block number, or the string `"earliest"`, `"latest"` or `"pending"`, as in the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter).

```
params: [
   '0xe8', // 232
]
```

**Returns**

`QUANTITY` - integer of the number of transactions in this block.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockTransactionCountByNumber","params":["0xe8"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xa" // 10
}
```

### **eth\_getUncleCountByBlockHash**

Returns the number of uncles in a block from a block matching the given block hash.

**Parameters**

1. `DATA`, 32 Bytes - hash of a block.

```
params: [
   '0xc94770007dda54cF92009BFF0dE90c06F603a09f'
]
```

**Returns**

`QUANTITY` - integer of the number of uncles in this block.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleCountByBlockHash","params":["0xc94770007dda54cF92009BFF0dE90c06F603a09f"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xc" // 1
}
```

### **eth\_getUncleCountByBlockNumber**

Returns the number of uncles in a block from a block matching the given block number.

**Parameters**

1. `QUANTITY|TAG` - integer of a block number, or the string "latest", "earliest" or "pending", see the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter).

```
params: [
   '0xe8', // 232
]
```

**Returns**

`QUANTITY` - integer of the number of uncles in this block.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleCountByBlockNumber","params":["0xe8"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x1" // 1
}
```

### **eth\_getCode**

Returns code at a given address.

**Parameters**

1. `DATA`, 20 Bytes - address.
2. `QUANTITY|TAG` - integer block number, or the string `"latest"`, `"earliest"` or `"pending"`, see the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter).

```
params: [
   '0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b',
   '0x2'  // 2
]
```

**Returns**

`DATA` - the code from the given address.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getCode","params":["0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b", "0x2"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x600160008035811a818181146012578301005b601b6001356025565b8060005260206000f25b600060078202905091905056"
}
```

### **eth\_sign**

The sign method calculates an pchain specific signature with: `sign(keccak256("\x19Ethereum Signed Message:\n" + len(message) + message)))`.

By adding a prefix to the message makes the calculated signature recognisable as an pchain specific signature. This prevents misuse where a malicious DApp can sign arbitrary data (e.g. transaction) and use the signature to impersonate the victim.

**Note** the address to sign with must be unlocked.

**Parameters**

account, message

1. `DATA`, 20 Bytes - address.
2. `DATA`, N Bytes - message to sign.

**Returns**

`DATA`: Signature

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_sign","params":["0x9b2055d370f73ec7d8a03e965129118dc8f5bf83", "0xdeadbeaf"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xa3f20717a250c2b0b729b7e5becbff67fdaef7e0699da4de7ca5895b02a170a12d887fd3b17bfdce3481f10bea41f45ba9f709d39ce8325427b57afcfc994cee1b"
}
```

An example how to use solidity ecrecover to verify the signature calculated with `eth_sign` can be found [here](https://gist.github.com/bas-vk/d46d83da2b2b4721efb0907aecdb7ebd). The contract is deployed on the testnet Ropsten and Rinkeby.

### **eth\_sendTransaction**

Creates new message call transaction or a contract creation, if the data field contains code.

**Parameters**

1. `Object` - The transaction object

* `from`: `DATA`, 20 Bytes - The address the transaction is send from.
* `to`: `DATA`, 20 Bytes - (optional when creating new contract) The address the transaction is directed to.
* `gas`: `QUANTITY` - (optional, default: 90000) Integer of the gas provided for the transaction execution. It will return unused gas.
* `gasPrice`: `QUANTITY` - (optional, default: To-Be-Determined) Integer of the gasPrice used for each paid gas
* `value`: `QUANTITY` - (optional) Integer of the value sent with this transaction
* `data`: `DATA` - The compiled code of a contract OR the hash of the invoked method signature and encoded parameters. For details see [Pchain Contract ABI](https://psolidity.readthedocs.io/en/latest/abi-spec.html)
* `nonce`: `QUANTITY` - (optional) Integer of a nonce. This allows to overwrite your own pending transactions that use the same nonce.

```
params: [{
  "from": "0xb60e8dd61c5d32be8058bb8eb970870f07233155",
  "to": "0xd46e8dd67c5d32be8058bb8eb970870f07244567",
  "gas": "0x76c0", // 30400
  "gasPrice": "0x9184e72a000", // 10000000000000
  "value": "0x9184e72a", // 2441406250
  "data": "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
}]
```

**Returns**

`DATA`, 32 Bytes - the transaction hash, or the zero hash if the transaction is not yet available.

Use [eth\_getTransactionReceipt](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_gettransactionreceipt) to get the contract address, after the transaction was mined, when you created a contract.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_sendTransaction","params":[{see above}],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331"
}
```

### **eth\_sendRawTransaction**

Creates new message call transaction or a contract creation for signed transactions.

**Parameters**

1. `DATA`, The signed transaction data.

```
params: ["0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"]
```

**Returns**

`DATA`, 32 Bytes - the transaction hash, or the zero hash if the transaction is not yet available.

Use [eth\_getTransactionReceipt](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_gettransactionreceipt) to get the contract address, after the transaction was mined, when you created a contract.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_sendRawTransaction","params":[{see above}],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331"
}
```

### **eth\_call**

Executes a new message call immediately without creating a transaction on the block chain.

**Parameters**

1. `Object` - The transaction call object

* `from`: `DATA`, 20 Bytes - (optional) The address the transaction is sent from.
* `to`: `DATA`, 20 Bytes - The address the transaction is directed to.
* `gas`: `QUANTITY` - (optional) Integer of the gas provided for the transaction execution. eth\_call consumes zero gas, but this parameter may be needed by some executions.
* `gasPrice`: `QUANTITY` - (optional) Integer of the gasPrice used for each paid gas
* `value`: `QUANTITY` - (optional) Integer of the value sent with this transaction
* `data`: `DATA` - (optional) Hash of the method signature and encoded parameters. For details see [Pchain Contract ABI](https://psolidity.readthedocs.io/en/latest/abi-spec.html)

1. `QUANTITY|TAG` - integer block number, or the string `"latest"`, `"earliest"` or `"pending"`, see the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter)

**Returns**

`DATA` - the return value of executed contract.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_call","params":[{see above}],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x"
}
```

### **eth\_estimateGas**

Generates and returns an estimate of how much gas is necessary to allow the transaction to complete. The transaction will not be added to the blockchain. Note that the estimate may be significantly more than the amount of gas actually used by the transaction, for a variety of reasons including EVM mechanics and node performance.

**Parameters**

See [eth\_call](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_call) parameters, expect that all properties are optional. If no gas limit is specified geth uses the block gas limit from the pending block as an upper bound. As a result the returned estimate might not be enough to executed the call/transaction when the amount of gas is higher than the pending block gas limit.

**Returns**

`QUANTITY` - the amount of gas used.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_estimateGas","params":[{see above}],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x5208" // 21000
}
```

### **eth\_getBlockByHash**

Returns information about a block by hash.

**Parameters**

1. `DATA`, 32 Bytes - Hash of a block.
2. `Boolean` - If `true` it returns the full transaction objects, if `false` only the hashes of the transactions.

```
params: [
   '0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331',
   true
]
```

**Returns**

`Object` - A block object, or `null` when no block was found:

* `number`: `QUANTITY` - the block number. `null` when its pending block.
* `hash`: `DATA`, 32 Bytes - hash of the block. `null` when its pending block.
* `parentHash`: `DATA`, 32 Bytes - hash of the parent block.
* `nonce`: `DATA`, 8 Bytes - hash of the generated proof-of-work. `null` when its pending block.
* `sha3Uncles`: `DATA`, 32 Bytes - SHA3 of the uncles data in the block.
* `logsBloom`: `DATA`, 256 Bytes - the bloom filter for the logs of the block. `null` when its pending block.
* `transactionsRoot`: `DATA`, 32 Bytes - the root of the transaction trie of the block.
* `stateRoot`: `DATA`, 32 Bytes - the root of the final state trie of the block.
* `receiptsRoot`: `DATA`, 32 Bytes - the root of the receipts trie of the block.
* `miner`: `DATA`, 20 Bytes - the address of the beneficiary to whom the mining rewards were given.
* `difficulty`: `QUANTITY` - integer of the difficulty for this block.
* `totalDifficulty`: `QUANTITY` - integer of the total difficulty of the chain until this block.
* `extraData`: `DATA` - the "extra data" field of this block.
* `size`: `QUANTITY` - integer the size of this block in bytes.
* `gasLimit`: `QUANTITY` - the maximum gas allowed in this block.
* `gasUsed`: `QUANTITY` - the total used gas by all transactions in this block.
* `timestamp`: `QUANTITY` - the unix timestamp for when the block was collated.
* `transactions`: `Array` - Array of transaction objects, or 32 Bytes transaction hashes depending on the last given parameter.
* `uncles`: `Array` - Array of uncle hashes.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByHash","params":["0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331", true],"id":1}'

// Result
{
"id":1,
"jsonrpc":"2.0",
"result": {
    "number": "0x1b4", // 436
    "hash": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331",
    "parentHash": "0x9646252be9520f6e71339a8df9c55e4d7619deeb018d2a3f2d21fc165dde5eb5",
    "nonce": "0xe04d296d2460cfb8472af2c5fd05b5a214109c25688d3704aed5484f9a7792f2",
    "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
    "logsBloom": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331",
    "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "stateRoot": "0xd5855eb08b3387c0af375e9cdb6acfc05eb8f519e419b874b6ff2ffda7ed1dff",
    "miner": "0x4e65fda2159562a496f9f3522f89122a3088497a",
    "difficulty": "0x027f07", // 163591
    "totalDifficulty":  "0x027f07", // 163591
    "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "size":  "0x027f07", // 163591
    "gasLimit": "0x9f759", // 653145
    "gasUsed": "0x9f759", // 653145
    "timestamp": "0x54e34e8e" // 1424182926
    "transactions": [{...},{ ... }] 
    "uncles": ["0x1606e5...", "0xd5145a9..."]
  }
}
```

### **eth\_getBlockByNumber**

Returns information about a block by block number.

**Parameters**

1. `QUANTITY|TAG` - integer of a block number, or the string `"earliest"`, `"latest"` or `"pending"`, as in the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter).
2. `Boolean` - If `true` it returns the full transaction objects, if `false` only the hashes of the transactions.

```
params: [
   '0x1b4', // 436
   true
]
```

**Returns**

See [eth\_getBlockByHash](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getblockbyhash)

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["0x1b4", true],"id":1}'
```

Result see [eth\_getBlockByHash](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getblockbyhash)

### **eth\_getTransactionByHash**

Returns the information about a transaction requested by transaction hash.

**Parameters**

1. `DATA`, 32 Bytes - hash of a transaction

```
params: [
   "0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b"
]
```

**Returns**

`Object` - A transaction object, or `null` when no transaction was found:

* `blockHash`: `DATA`, 32 Bytes - hash of the block where this transaction was in. `null` when its pending.
* `blockNumber`: `QUANTITY` - block number where this transaction was in. `null` when its pending.
* `from`: `DATA`, 20 Bytes - address of the sender.
* `gas`: `QUANTITY` - gas provided by the sender.
* `gasPrice`: `QUANTITY` - gas price provided by the sender in Wei.
* `hash`: `DATA`, 32 Bytes - hash of the transaction.
* `input`: `DATA` - the data send along with the transaction.
* `nonce`: `QUANTITY` - the number of transactions made by the sender prior to this one.
* `to`: `DATA`, 20 Bytes - address of the receiver. `null` when its a contract creation transaction.
* `transactionIndex`: `QUANTITY` - integer of the transaction's index position in the block. `null` when its pending.
* `value`: `QUANTITY` - value transferred in Wei.
* `v`: `QUANTITY` - ECDSA recovery id
* `r`: `DATA`, 32 Bytes - ECDSA signature r
* `s`: `DATA`, 32 Bytes - ECDSA signature s

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByHash","params":["0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b"],"id":1}'

// Result
{
  "jsonrpc":"2.0",
  "id":1,
  "result":{
    "blockHash":"0x1d59ff54b1eb26b013ce3cb5fc9dab3705b415a67127a003c3e61eb445bb8df2",
    "blockNumber":"0x5daf3b", // 6139707
    "from":"0xa7d9ddbe1f17865597fbd27ec712455208b6b76d",
    "gas":"0xc350", // 50000
    "gasPrice":"0x4a817c800", // 20000000000
    "hash":"0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b",
    "input":"0x68656c6c6f21",
    "nonce":"0x15", // 21
    "to":"0xf02c1c8e6114b1dbe8937a39260b5b0a374432bb",
    "transactionIndex":"0x41", // 65
    "value":"0xf3dbb76162000", // 4290000000000000
    "v":"0x25", // 37
    "r":"0x1b5e176d927f8e9ab405058b2d2457392da3e20f328b16ddabcebc33eaac5fea",
    "s":"0x4ba69724e8f69de52f0125ad8b3c5c2cef33019bac3249e2c0a2192766d1721c"
  }
}
```

### **eth\_getTransactionByBlockHashAndIndex**

Returns information about a transaction by block hash and transaction index position.

**Parameters**

1. `DATA`, 32 Bytes - hash of a block.
2. `QUANTITY` - integer of the transaction index position.

```
params: [
   '0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331',
   '0x0' // 0
]
```

**Returns**

See [eth\_getTransactionByHash](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_gettransactionbyhash)

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByBlockHashAndIndex","params":["0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b", "0x0"],"id":1}'
```

Result see [eth\_getTransactionByHash](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_gettransactionbyhash)

### **eth\_getTransactionByBlockNumberAndIndex**

Returns information about a transaction by block number and transaction index position.

**Parameters**

1. `QUANTITY|TAG` - a block number, or the string `"earliest"`, `"latest"` or `"pending"`, as in the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter).
2. `QUANTITY` - the transaction index position.

```
params: [
   '0x29c', // 668
   '0x0' // 0
]
```

**Returns**

See [eth\_getTransactionByHash](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_gettransactionbyhash)

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByBlockNumberAndIndex","params":["0x29c", "0x0"],"id":1}'
```

Result see [eth\_getTransactionByHash](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_gettransactionbyhash)

### **eth\_getTransactionReceipt**

Returns the receipt of a transaction by transaction hash.

**Note** That the receipt is not available for pending transactions.

**Parameters**

1. `DATA`, 32 Bytes - hash of a transaction

```
params: [
   '0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238'
]
```

**Returns**

`Object` - A transaction receipt object, or `null` when no receipt was found:

* `transactionHash` : `DATA`, 32 Bytes - hash of the transaction.
* `transactionIndex`: `QUANTITY` - integer of the transaction's index position in the block.
* `blockHash`: `DATA`, 32 Bytes - hash of the block where this transaction was in.
* `blockNumber`: `QUANTITY` - block number where this transaction was in.
* `from`: `DATA`, 20 Bytes - address of the sender.
* `to`: `DATA`, 20 Bytes - address of the receiver. null when it's a contract creation transaction.
* `cumulativeGasUsed` : `QUANTITY` - The total amount of gas used when this transaction was executed in the block.
* `gasUsed` : `QUANTITY` - The amount of gas used by this specific transaction alone.
* `contractAddress` : `DATA`, 20 Bytes - The contract address created, if the transaction was a contract creation, otherwise `null`.
* `logs`: `Array` - Array of log objects, which this transaction generated.
* `logsBloom`: `DATA`, 256 Bytes - Bloom filter for light clients to quickly retrieve related logs.

It also returns *either* :

* `root` : `DATA` 32 bytes of post-transaction stateroot (pre Byzantium)
* `status`: `QUANTITY` either `1` (success) or `0` (failure)

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"],"id":1}'

// Result
{
"id":1,
"jsonrpc":"2.0",
"result": {
     transactionHash: '0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238',
     transactionIndex:  '0x1', // 1
     blockNumber: '0xb', // 11
     blockHash: '0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b',
     cumulativeGasUsed: '0x33bc', // 13244
     gasUsed: '0x4dc', // 1244
     contractAddress: '0xb60e8dd61c5d32be8058bb8eb970870f07233155', // or null, if none was created
     logs: [{
         // logs as returned by getFilterLogs, etc.
     }, ...],
     logsBloom: "0x00...0", // 256 byte bloom filter
     status: '0x1'
  }
}
```

### **eth\_getUncleByBlockHashAndIndex**

Returns information about a uncle of a block by hash and uncle index position.

**Parameters**

1. `DATA`, 32 Bytes - hash a block.
2. `QUANTITY` - the uncle's index position.

```
params: [
   '0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b',
   '0x0' // 0
]
```

**Returns**

See [eth\_getBlockByHash](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getblockbyhash)

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleByBlockHashAndIndex","params":["0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b", "0x0"],"id":1}'
```

Result see [eth\_getBlockByHash](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getblockbyhash)

**Note**: An uncle doesn't contain individual transactions.

### **eth\_getUncleByBlockNumberAndIndex**

Returns information about a uncle of a block by number and uncle index position.

**Parameters**

1. `QUANTITY|TAG` - a block number, or the string `"earliest"`, `"latest"` or `"pending"`, as in the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter).
2. `QUANTITY` - the uncle's index position.

```
params: [
   '0x29c', // 668
   '0x0' // 0
]
```

**Returns**

See [eth\_getBlockByHash](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getblockbyhash)

**Note**: An uncle doesn't contain individual transactions.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleByBlockNumberAndIndex","params":["0x29c", "0x0"],"id":1}'
```

Result see [eth\_getBlockByHash](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getblockbyhash)

### **eth\_getCompilers (DEPRECATED)**

Returns a list of available compilers in the client.

**Parameters**

none

**Returns**

`Array` - Array of available compilers.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getCompilers","params":[],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": ["solidity", "lll", "serpent"]
}
```

### **eth\_compileSolidity (DEPRECATED)**

Returns compiled solidity code.

**Parameters**

1. `String` - The source code.

```
params: [
   "contract test { function multiply(uint a) returns(uint d) {   return a * 7;   } }",
]
```

**Returns**

`DATA` - The compiled source code.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_compileSolidity","params":["contract test { function multiply(uint a) returns(uint d) {   return a * 7;   } }"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": {
      "code": "0x605880600c6000396000f3006000357c010000000000000000000000000000000000000000000000000000000090048063c6888fa114602e57005b603d6004803590602001506047565b8060005260206000f35b60006007820290506053565b91905056",
      "info": {
        "source": "contract test {\n   function multiply(uint a) constant returns(uint d) {\n       return a * 7;\n   }\n}\n",
        "language": "Solidity",
        "languageVersion": "0",
        "compilerVersion": "0.9.19",
        "abiDefinition": [
          {
            "constant": true,
            "inputs": [
              {
                "name": "a",
                "type": "uint256"
              }
            ],
            "name": "multiply",
            "outputs": [
              {
                "name": "d",
                "type": "uint256"
              }
            ],
            "type": "function"
          }
        ],
        "userDoc": {
          "methods": {}
        },
        "developerDoc": {
          "methods": {}
        }
      }

}
```

### **eth\_compileLLL (DEPRECATED)**

Returns compiled LLL code.

**Parameters**

1. `String` - The source code.

```
params: [
   "(returnlll (suicide (caller)))",
]
```

**Returns**

`DATA` - The compiled source code.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_compileLLL","params":["(returnlll (suicide (caller)))"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x603880600c6000396000f3006001600060e060020a600035048063c6888fa114601857005b6021600435602b565b8060005260206000f35b600081600702905091905056" // the compiled source code
}
```

### **eth\_compileSerpent (DEPRECATED)**

Returns compiled serpent code.

**Parameters**

1. `String` - The source code.

```
params: [
   "/* some serpent */",
]
```

**Returns**

`DATA` - The compiled source code.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_compileSerpent","params":["/* some serpent */"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x603880600c6000396000f3006001600060e060020a600035048063c6888fa114601857005b6021600435602b565b8060005260206000f35b600081600702905091905056" // the compiled source code
}
```

### **eth\_newFilter**

Creates a filter object, based on filter options, to notify when the state changes (logs). To check if the state has changed, call [eth\_getFilterChanges](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getfilterchanges).

**A note on specifying topic filters:**

Topics are order-dependent. A transaction with a log with topics \[A, B] will be matched by the following topic filters:

* `[]` "anything"
* `[A]` "A in first position (and anything after)"
* `[null, B]` "anything in first position AND B in second position (and anything after)"
* `[A, B]` "A in first position AND B in second position (and anything after)"
* `[[A, B], [A, B]]` "(A OR B) in first position AND (A OR B) in second position (and anything after)"

**Parameters**

1. `Object` - The filter options:

* `fromBlock`: `QUANTITY|TAG` - (optional, default: `"latest"`) Integer block number, or `"latest"` for the last mined block or `"pending"`, `"earliest"` for not yet mined transactions.
* `toBlock`: `QUANTITY|TAG` - (optional, default: `"latest"`) Integer block number, or `"latest"` for the last mined block or `"pending"`, `"earliest"` for not yet mined transactions.
* `address`: `DATA|Array`, 20 Bytes - (optional) Contract address or a list of addresses from which logs should originate.
* `topics`: `Array of DATA`, - (optional) Array of 32 Bytes `DATA` topics. Topics are order-dependent. Each topic can also be an array of DATA with "or" options.

```
params: [{
  "fromBlock": "0x1",
  "toBlock": "0x2",
  "address": "0x8888f1f195afa192cfee860698584c030f4c9db1",
  "topics": ["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b", null, ["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b", "0x0000000000000000000000000aff3454fce5edbc8cca8697c15331677e6ebccc"]]
}]
```

**Returns**

`QUANTITY` - A filter id.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_newFilter","params":[{"topics":["0x0000000000000000000000000000000000000000000000000000000012341234"]}],"id":73}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x1" // 1
}
```

### **eth\_newBlockFilter**

Creates a filter in the node, to notify when a new block arrives. To check if the state has changed, call [eth\_getFilterChanges](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getfilterchanges).

**Parameters**

None

**Returns**

`QUANTITY` - A filter id.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_newBlockFilter","params":[],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":  "2.0",
  "result": "0x1" // 1
}
```

### **eth\_newPendingTransactionFilter**

Creates a filter in the node, to notify when new pending transactions arrive. To check if the state has changed, call [eth\_getFilterChanges](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getfilterchanges).

**Parameters**

None

**Returns**

`QUANTITY` - A filter id.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_newPendingTransactionFilter","params":[],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":  "2.0",
  "result": "0x1" // 1
}
```

### **eth\_uninstallFilter**

Uninstalls a filter with given id. Should always be called when watch is no longer needed. Additonally Filters timeout when they aren't requested with [eth\_getFilterChanges](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getfilterchanges) for a period of time.

**Parameters**

1. `QUANTITY` - The filter id.

```
params: [
  "0xb" // 11
]
```

**Returns**

`Boolean` - `true` if the filter was successfully uninstalled, otherwise `false`.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_uninstallFilter","params":["0xb"],"id":73}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": true
}
```

### **eth\_getFilterChanges**

Polling method for a filter, which returns an array of logs which occurred since last poll.

**Parameters**

1. `QUANTITY` - the filter id.

```
params: [
  "0x16" // 22
]
```

**Returns**

`Array` - Array of log objects, or an empty array if nothing has changed since last poll.

* For filters created with `eth_newBlockFilter` the return are block hashes (`DATA`, 32 Bytes), e.g. `["0x3454645634534..."]`.
* For filters created with `eth_newPendingTransactionFilter` the return are transaction hashes (`DATA`, 32 Bytes), e.g. `["0x6345343454645..."]`.
* For filters created with `eth_newFilter` logs are objects with following params:
  * `removed`: `TAG` - `true` when the log was removed, due to a chain reorganization. `false` if its a valid log.
  * `logIndex`: `QUANTITY` - integer of the log index position in the block. `null` when its pending log.
  * `transactionIndex`: `QUANTITY` - integer of the transactions index position log was created from. `null` when its pending log.
  * `transactionHash`: `DATA`, 32 Bytes - hash of the transactions this log was created from. `null` when its pending log.
  * `blockHash`: `DATA`, 32 Bytes - hash of the block where this log was in. `null` when its pending. `null` when its pending log.
  * `blockNumber`: `QUANTITY` - the block number where this log was in. `null` when its pending. `null` when its pending log.
  * `address`: `DATA`, 20 Bytes - address from which this log originated.
  * `data`: `DATA` - contains the non-indexed arguments of the log.
  * `topics`: `Array of DATA` - Array of 0 to 4 32 Bytes `DATA` of indexed log arguments. (In *solidity*: The first topic is the *hash* of the signature of the event (e.g. `Deposit(address,bytes32,uint256)`), except you declared the event with the `anonymous` specifier.)

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getFilterChanges","params":["0x16"],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": [{
    "logIndex": "0x1", // 1
    "blockNumber":"0x1b4", // 436
    "blockHash": "0x8216c5785ac562ff41e2dcfdf5785ac562ff41e2dcfdf829c5a142f1fccd7d",
    "transactionHash":  "0xdf829c5a142f1fccd7d8216c5785ac562ff41e2dcfdf5785ac562ff41e2dcf",
    "transactionIndex": "0x0", // 0
    "address": "0x16c5785ac562ff41e2dcfdf829c5a142f1fccd7d",
    "data":"0x0000000000000000000000000000000000000000000000000000000000000000",
    "topics": ["0x59ebeb90bc63057b6515673c3ecf9438e5058bca0f92585014eced636878c9a5"]
    },{
      ...
    }]
}
```

### **eth\_getFilterLogs**

Returns an array of all logs matching filter with given id.

**Parameters**

1. `QUANTITY` - The filter id.

```
params: [
  "0x16" // 22
]
```

**Returns**

See [eth\_getFilterChanges](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getfilterchanges)

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getFilterLogs","params":["0x16"],"id":74}'
```

Result see [eth\_getFilterChanges](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getfilterchanges)

### **eth\_getLogs**

Returns an array of all logs matching a given filter object.

**Parameters**

1. `Object` - The filter options:

* `fromBlock`: `QUANTITY|TAG` - (optional, default: `"latest"`) Integer block number, or `"latest"` for the last mined block or `"pending"`, `"earliest"` for not yet mined transactions.
* `toBlock`: `QUANTITY|TAG` - (optional, default: `"latest"`) Integer block number, or `"latest"` for the last mined block or `"pending"`, `"earliest"` for not yet mined transactions.
* `address`: `DATA|Array`, 20 Bytes - (optional) Contract address or a list of addresses from which logs should originate.
* `topics`: `Array of DATA`, - (optional) Array of 32 Bytes `DATA` topics. Topics are order-dependent. Each topic can also be an array of DATA with "or" options.
* `blockhash`: `DATA`, 32 Bytes - (optional) With the addition of EIP-234 (Geth >= v1.8.13 or Parity >= v2.1.0), `blockHash` is a new filter option which restricts the logs returned to the single block with the 32-byte hash `blockHash`. Using `blockHash` is equivalent to `fromBlock` = `toBlock` = the block number with hash `blockHash`. If `blockHash` is present in the filter criteria, then neither `fromBlock` nor `toBlock` are allowed.

```
params: [{
  "topics": ["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b"]
}]
```

**Returns**

See [eth\_getFilterChanges](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getfilterchanges)

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getLogs","params":[{"topics":["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b"]}],"id":74}'
```

Result see [eth\_getFilterChanges](https://github.com/pchain-org/pchain/wiki/JSON-RPC#eth_getfilterchanges)

### **eth\_getWork**

Returns the hash of the current block, the seedHash, and the boundary condition to be met ("target").

**Parameters**

none

**Returns**

`Array` - Array with the following properties:

1. `DATA`, 32 Bytes - current block header pow-hash
2. `DATA`, 32 Bytes - the seed hash used for the DAG.
3. `DATA`, 32 Bytes - the boundary condition ("target"), 2^256 / difficulty.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getWork","params":[],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": [
      "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
      "0x5EED00000000000000000000000000005EED0000000000000000000000000000",
      "0xd1ff1c01710000000000000000000000d1ff1c01710000000000000000000000"
    ]
}
```

### **eth\_submitWork**

Used for submitting a proof-of-work solution.

**Parameters**

1. `DATA`, 8 Bytes - The nonce found (64 bits)
2. `DATA`, 32 Bytes - The header's pow-hash (256 bits)
3. `DATA`, 32 Bytes - The mix digest (256 bits)

```
params: [
  "0x0000000000000001",
  "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
  "0xD1FE5700000000000000000000000000D1FE5700000000000000000000000000"
]
```

**Returns**

`Boolean` - returns `true` if the provided solution is valid, otherwise `false`.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0", "method":"eth_submitWork", "params":["0x0000000000000001", "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef", "0xD1GE5700000000000000000000000000D1GE5700000000000000000000000000"],"id":73}'

// Result
{
  "id":73,
  "jsonrpc":"2.0",
  "result": true
}
```

### **eth\_submitHashrate**

Used for submitting mining hashrate.

**Parameters**

1. `Hashrate`, a hexadecimal string representation (32 bytes) of the hash rate
2. `ID`, String - A random hexadecimal(32 bytes) ID identifying the client

```
params: [
  "0x0000000000000000000000000000000000000000000000000000000000500000",
  "0x59daa26581d0acd1fce254fb7e85952f4c09d0915afd33d3886cd914bc7d283c"
]
```

**Returns**

`Boolean` - returns `true` if submitting went through succesfully and `false` otherwise.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0", "method":"eth_submitHashrate", "params":["0x0000000000000000000000000000000000000000000000000000000000500000", "0x59daa26581d0acd1fce254fb7e85952f4c09d0915afd33d3886cd914bc7d283c"],"id":73}'

// Result
{
  "id":73,
  "jsonrpc":"2.0",
  "result": true
}
```

### **eth\_getProof**

Returns the account- and storage-values of the specified account including the Merkle-proof.

**getProof-Parameters**

1. `DATA`, 20 bytes - address of the account or contract
2. `ARRAY`, 32 Bytes - array of storage-keys which should be proofed and included. See eth\_getStorageAt
3. `QUANTITY|TAG` - integer block number, or the string "latest" or "earliest", see the default block parameter

```
params: ["0x1234567890123456789012345678901234567890",["0x0000000000000000000000000000000000000000000000000000000000000000","0x0000000000000000000000000000000000000000000000000000000000000001"],"latest"]
```

**getProof-Returns**

Returns `Object` - A account object:

`balance`: `QUANTITY` - the balance of the account. See eth\_getBalance

`codeHash`: `DATA`, 32 Bytes - hash of the code of the account. For a simple Account without code it will return "0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"

`nonce`: `QUANTITY`, - nonce of the account. See eth\_getTransactionCount

`storageHash`: `DATA`, 32 Bytes - SHA3 of the StorageRoot. All storage will deliver a MerkleProof starting with this rootHash.

`accountProof`: `ARRAY` - Array of rlp-serialized MerkleTree-Nodes, starting with the stateRoot-Node, following the path of the SHA3 (address) as key.

`storageProof`: `ARRAY` - Array of storage-entries as requested. Each entry is a object with these properties:

`key`: `QUANTITY` - the requested storage key `value`: `QUANTITY` - the storage value `proof`: `ARRAY` - Array of rlp-serialized MerkleTree-Nodes, starting with the storageHash-Node, following the path of the SHA3 (key) as path.

**getProof-Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getProof","params":["0x1234567890123456789012345678901234567890",["0x0000000000000000000000000000000000000000000000000000000000000000","0x0000000000000000000000000000000000000000000000000000000000000001"],"latest"],"id":1}' -H "Content-type:application/json" http://localhost:8545

// Result
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "address": "0x1234567890123456789012345678901234567890",
    "accountProof": [
      "0xf90211a090dcaf88c40c7bbc95a912cbdde67c175767b31173df9ee4b0d733bfdd511c43a0babe369f6b12092f49181ae04ca173fb68d1a5456f18d20fa32cba73954052bda0473ecf8a7e36a829e75039a3b055e51b8332cbf03324ab4af2066bbd6fbf0021a0bbda34753d7aa6c38e603f360244e8f59611921d9e1f128372fec0d586d4f9e0a04e44caecff45c9891f74f6a2156735886eedf6f1a733628ebc802ec79d844648a0a5f3f2f7542148c973977c8a1e154c4300fec92f755f7846f1b734d3ab1d90e7a0e823850f50bf72baae9d1733a36a444ab65d0a6faaba404f0583ce0ca4dad92da0f7a00cbe7d4b30b11faea3ae61b7f1f2b315b61d9f6bd68bfe587ad0eeceb721a07117ef9fc932f1a88e908eaead8565c19b5645dc9e5b1b6e841c5edbdfd71681a069eb2de283f32c11f859d7bcf93da23990d3e662935ed4d6b39ce3673ec84472a0203d26456312bbc4da5cd293b75b840fc5045e493d6f904d180823ec22bfed8ea09287b5c21f2254af4e64fca76acc5cd87399c7f1ede818db4326c98ce2dc2208a06fc2d754e304c48ce6a517753c62b1a9c1d5925b89707486d7fc08919e0a94eca07b1c54f15e299bd58bdfef9741538c7828b5d7d11a489f9c20d052b3471df475a051f9dd3739a927c89e357580a4c97b40234aa01ed3d5e0390dc982a7975880a0a089d613f26159af43616fd9455bb461f4869bfede26f2130835ed067a8b967bfb80",
      "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",
      "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",
      "0xf851808080a009833150c367df138f1538689984b8a84fc55692d3d41fe4d1e5720ff5483a6980808080808080808080a0a319c1c415b271afc0adcb664e67738d103ac168e0bc0b7bd2da7966165cb9518080"
    ],
    "balance": "0x0",
    "codeHash": "0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470",
    "nonce": "0x0",
    "storageHash": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "storageProof": [
      {
        "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "value": "0x0",
        "proof": []
      },
      {
        "key": "0x0000000000000000000000000000000000000000000000000000000000000001",
        "value": "0x0",
        "proof": []
      }
    ]
  }
}
```

### **db\_putString**

Stores a string in the local database.

**Note** this function is deprecated and will be removed in the future.

**Parameters**

1. `String` - Database name.
2. `String` - Key name.
3. `String` - String to store.

```
params: [
  "testDB",
  "myKey",
  "myString"
]
```

**Returns**

`Boolean` - returns `true` if the value was stored, otherwise `false`.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"db_putString","params":["testDB","myKey","myString"],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": true
}
```

### **db\_getString**

Returns string from the local database.

**Note** this function is deprecated and will be removed in the future.

**Parameters**

1. `String` - Database name.
2. `String` - Key name.

```
params: [
  "testDB",
  "myKey",
]
```

**Returns**

`String` - The previously stored string.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"db_getString","params":["testDB","myKey"],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": "myString"
}
```

### **db\_putHex**

Stores binary data in the local database.

**Note** this function is deprecated and will be removed in the future.

**Parameters**

1. `String` - Database name.
2. `String` - Key name.
3. `DATA` - The data to store.

```
params: [
  "testDB",
  "myKey",
  "0x68656c6c6f20776f726c64"
]
```

**Returns**

`Boolean` - returns `true` if the value was stored, otherwise `false`.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"db_putHex","params":["testDB","myKey","0x68656c6c6f20776f726c64"],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": true
}
```

### **db\_getHex**

Returns binary data from the local database.

**Note** this function is deprecated and will be removed in the future.

**Parameters**

1. `String` - Database name.
2. `String` - Key name.

```
params: [
  "testDB",
  "myKey",
]
```

**Returns**

`DATA` - The previously stored data.

**Example**

```
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"db_getHex","params":["testDB","myKey"],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": "0x68656c6c6f20776f726c64"
}
```

### **chain\_createChildChain**

Send an application of Subchain Creation, save the application into the ChainInfo DB

**Parameters**

1. `from`, address - the address who triggers the action (Dont create different Subchain with same address)
2. `chainId`, string - subchain id
3. `minValidators`, hex string - Minimum Validators of the new subchain
4. `minDepositAmount`, hex string - Minimum Deposit PAI of the new subchain
5. `startBlock`, hex string - Start Block height for launch subchain
6. `endBlock`, hex string - End Block height for launch subchain
7. `gasPrice`: hex string - (optional, default: 1 gwei) gas price from the request

```
params: [
   "0xa349d8a4e35f0c922377168daae653b5c9f1d370",
   "pchain-child-8",
   "0x1",
   "0x152D02C7E14AF6800000",
   "0x32",
   "0x7D0"
]
```

**Returns**

`hash`, string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"chain_createChildChain","params":["0xa349d8a4e35f0c922377168daae653b5c9f1d370","pchain-child-8", "0x1", "0x152D02C7E14AF6800000", "0x32","0x7D0"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xadef13..."
}
```

### **chain\_joinChildChain**

Send a request to Join the subchain, save the Join Application into the ChainInfo DB, after the blockchain match the criteria of the subchain, chainMgr will load the subchain Data from ChainInfo DB then start it

**Parameters**

1. `from`: address, 20 Bytes - the address who triggers the action
2. `pubkey`: hex string, 128 Bytes - the BLS Public Key who triggers the action
3. `chainId`: string - subchain id
4. `depositAmount`: hex string - Amount of the Deposit PAI to join the subchain
5. `signature`: hex string, 64 Bytes - the signature of From Address, signed by BLS Private Key. (How to sign, see [chain\_signAddress](https://github.com/pchain-org/pchain/wiki/JSON-RPC#chain_signAddress))
6. `gasPrice`: hex string - (optional, default: 1 gwei) gas price from the request

```
params: [
   "0x5CE010Bf008Ba976Dd80Ed968a2f916190Cf9b4f",
  "5CCB45F727A7075C9336DF357A3610DD884FD97E64FFB51EED30890B8B3519E36D1C211A7BC1335C09CE654779328F1D01D997C1B2C5F9D196AD67FA5AF7A00273CED363C50D8F12B4EA096AFB859D6311C63C910752D41C0532C2D2654DCA863F7D56B2B9C33E0E7A5A0349F6B4FC20AE15526C5463F11D76FA92AB183ECEBE",
   "pchain-child-8",
   "0x152D02C7E14AF6800000",
   "0x6e5ea219800849592e67f76d45742a29c42a20b0b9d853facf32ac788591869e3db50a10770d88b93f24d2f6efed8acd220bce6442db7a2fbadfdada2d2cde73"
]
```

**Returns**

`hash`, hex string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"chain_joinChildChain","params":["0x5CE010Bf008Ba976Dd80Ed968a2f916190Cf9b4f","5CCB45F727A7075C9336DF357A3610DD884FD97E64FFB51EED30890B8B3519E36D1C211A7BC1335C09CE654779328F1D01D997C1B2C5F9D196AD67FA5AF7A00273CED363C50D8F12B4EA096AFB859D6311C63C910752D41C0532C2D2654DCA863F7D56B2B9C33E0E7A5A0349F6B4FC20AE15526C5463F11D76FA92AB183ECEBE", "pchain-child-8", "0x152D02C7E14AF6800000", "0x6e5ea219800849592e67f76d45742a29c42a20b0b9d853facf32ac788591869e3db50a10770d88b93f24d2f6efed8acd220bce6442db7a2fbadfdada2d2cde73"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xadef13..."
}
```

### **chain\_depositInMainChain**

Deposit from the main chain to subchain (step 1). Should be used with chain\_depositInChildChain.

**Parameters**

1. `from`, address - the address who triggers the action
2. `chainId`, string - subchain id
3. `amount`, hex string - amount of PAI to deposit
4. `gasPrice`: hex string - (optional, default: 1 gwei) gas price from the request

```
params: [
   "0xB3544059698177F14968D29A25AFD0D6D65F4534",
   "pchain_child_0",
   "0xA968163F0A57B4000000",
   "0x5208",
   "0xBA43B7400"
]
```

**Returns**

`hash`, string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"chain_depositInMainChain","params":["0xB3544059698177F14968D29A25AFD0D6D65F4534", "pchain_child_0", "0xA968163F0A57B4000000", "0x5208", "0xBA43B7400"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x31d6fe..."
}
```

### **chain\_depositInChildChain**

Deposit from the main chain to subchain (step 2). Should be used with chain\_depositInMainChain

**Parameters**

1. `from`, address - the address who triggers the action
2. `txHash`, string - Tx Hash of the chain\_depositInMainChain rpc

```
params: [
   "0xB3544059698177F14968D29A25AFD0D6D65F4534",
   "0x31d6fe38869272a821ac7a2b3b00aba9cb486f02cc570895f8f5d2dea8f7b5dc",
]
```

**Returns**

`hash`, string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"chain_depositInChildChain","params":["0xB3544059698177F14968D29A25AFD0D6D65F4534", "0x31d6fe38869272a821ac7a2b3b00aba9cb486f02cc570895f8f5d2dea8f7b5dc"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x60c54f..."
}
```

### **chain\_withdrawFromChildChain**

Withdraw from subchain to the main chain (step 1). Should be used with chain\_withdrawFromMainChain

**Parameters**

1. `from`, address - the address who triggers the action
2. `amount`, hex string - amount of PAI to withdraw
3. `gasPrice`: hex string - (optional, default: 1 gwei) gas price from the request

```
params: [
   "0xB3544059698177F14968D29A25AFD0D6D65F4534",
   "0x3F870857A3E0E3800000",
]
```

**Returns**

`hash`, string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"chain_withdrawFromChildChain","params":["0xB3544059698177F14968D29A25AFD0D6D65F4534", "0x3F870857A3E0E3800000"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x6ff2ac..."
}
```

### **chain\_withdrawFromMainChain**

Withdraw from subchain to the main chain (step 2). Should be used with chain\_withdrawFromChildChain

**Parameters**

1. `from`, address - the address who triggers the action
2. `amount`, hex string - amount of PAI to withdraw
3. `chainId`, string - subchain id
4. `txHash`, string - Tx Hash of the chain\_withdrawFromChildChain rpc

```
params: [
   "0xB3544059698177F14968D29A25AFD0D6D65F4534",
   "0x3F870857A3E0E3800000",
   "pchain_child_0",
   "0x6ff2ac4bb53ef7907bef3219eb3f2684b66df8a22048a80270960f9671ed0007"
]
```

**Returns**

`hash`, string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"chain_withdrawFromMainChain","params":["0xB3544059698177F14968D29A25AFD0D6D65F4534", "0x3F870857A3E0E3800000", "pchain_child_0", "0x6ff2ac4bb53ef7907bef3219eb3f2684b66df8a22048a80270960f9671ed0007"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xdacc81..."
}
```

### **chain\_signAddress**

Sign the Address with BLS Private Key, return the BLS Signature to proof you are the owner of the BLS Public Key

**Parameters**

1. `from`: address, 20 Bytes - Address which will be signed
2. `privateKey`: hex string, 32 Bytes - BLS Private Key

```
params: [
   "0xFD6AA07FF92907886B10B8E8863DDF8BA1902109",
   "0xA1BCB0033FC989D34026EED71AE6C57004CF1FBDC520ABF112B13FF7C03B62C6"
]
```

**Returns**

`DATA`, 64 Bytes - the BLS Signature for the Address

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"chain_signAddress","params":["0xFD6AA07FF92907886B10B8E8863DDF8BA1902109", "0xA1BCB0033FC989D34026EED71AE6C57004CF1FBDC520ABF112B13FF7C03B62C6"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x64ad80a3741c7d0f2a9e879906b61464d98797c13c7d1e316928f67b44fbde3a69ededf8424eb178fe16222a1cb18c3ca5bebd8cad75dff8f88e31e282e3df6c"
}
```

### **chain\_setBlockReward**

Set the Reward of each block for the subchain, only subchain Owner is allowed to send this tx. The Block Reward change will effect on the next block after this tx be mined.

The Block Reward will be charged from subchain Address 0x0000000000000000000000000000000000000064 balance, which accept anyone to transfer their contribution

**Parameters**

1. `from`: address, 20 Bytes - Owner Address of  subchain
2. `reward`: hex string - The reward of each block

```
params: [
   "0xFD6AA07FF92907886B10B8E8863DDF8BA1902109",
   "0x10"
]
```

**Returns**

`hash`, string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"chain_setBlockReward","params":["0xFD6AA07FF92907886B10B8E8863DDF8BA1902109", "0x10"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xa4r5b7..."
}
```

### **chain\_getBlockReward**

Get the Reward of each block for the subchain

**Parameters**

1. `QUANTITY|TAG` - integer block number, or the string `"latest"`, `"earliest"` or `"pending"`, see the [default block parameter](https://github.com/pchain-org/pchain/wiki/JSON-RPC#the-default-block-parameter)

```
params: [
   "0x670"
]
```

**Returns**

`QUANTITY` - integer of the block reward in wei

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"chain_getBlockReward","params":["0x670"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x64" // 100
}
```

### **chain\_getAllChains**

Get all the Chain Info from the node (A synced Full node should have all the chains' info)

**Parameters**

none

**Returns**

`Object` - The chain info object

* `chain_id`: `String` - The chain id of the chain.
* `owner`: `Address`, 20 Bytes - The owner address of the chain.
* `current_epoch`: `Number` - The current epoch number of the chain.
* `epoch_start_time`: `Time` - The start time of the current epoch
* `validators`: `Array` - Array of validator object
  * `address`: `Address` - Address of the Validator
  * `voting_power`: `QUANTITY` - Voting Power (Stack) of the Validator

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"chain_getAllChains","params":[],"id":1}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": [
        {
            "chain_id": "pchain",
            "owner": "0x0000000000000000000000000000000000000000",
            "current_epoch": 103,
            "epoch_start_time": "2019-02-12T03:25:20.988Z",
            "validators": [
                {
                    "address": "0x4cacbcbf218679dcc9574a90a2061bca4a8d8b6c",
                    "voting_power": 1.99999999999999983222784e+23
                },
                {
                    "address": "0x79cd31b59e3faab6deea68fbbaafa4da748bbdf6",
                    "voting_power": 1.99999999999999983222784e+23
                },
                {
                    "address": "0xc6179a651918888251380a4e3fee6af81cf091d1",
                    "voting_power": 1.99999999999999983222784e+23
                }
            ]
        }
    ]
}
```

### **tdm\_voteNextEpoch**

Send hash of Vote for the next epoch (The valid window for this vote is between 75% - 85% of current epoch time, to know the detail block height, use tdm\_getEpoch)

**Parameters**

1. `from`: address, 20 Bytes - the address who triggers the action
2. `voteHash`: hex string, 32 Bytes - hash of the vote. (How to get the vote hash, use Keccak-256 (not the standardized SHA3-256) example: keccak256(from + pubkey + amount + salt) ),you can get pubkey from 'priv\_validator.json' in the datadir directory(Default \~/.pchain on linux).You can get vote hash By Javascript API [web3getvotehash](https://github.com/pchain-org/pweb3/wiki/JavaScript-API#web3getvotehash)
3. `gasPrice`: hex string - (optional, default: 1 gwei) gas price from the request

```
params: [
   "0xB3544059698177F14968D29A25AFD0D6D65F4534",
   "0xa394508546db4256283598119da9638fdb62655572722c6e2abea5f150512f2d"
]
```

**Returns**

`hash`, string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"tdm_voteNextEpoch","params":["0xB3544059698177F14968D29A25AFD0D6D65F4534", "0x1234564bb53ef7907bef3219eb3f2684b66df8a22048a80270960f9671ed0007"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xa4r5b7..."
}
```

### **tdm\_revealVote**

Reveal the vote, the content of vote should matched with the hash which provided in tdm\_voteNextEpoch (The valid window for this vote is between 85% - 95% of current epoch time, to know the detail block height, use tdm\_getEpoch)

**Parameters**

1. `from`: address, 20 Bytes - the address who triggers the action
2. `pubkey`: hex string, 128 Bytes - the BLS Public Key who triggers the action
3. `amount`: hex string - the amount of vote
4. `salt`: string - salt string
5. `signature`: hex string, 64 Bytes - the signature of From Address, signed by BLS Private Key. (How to sign, see [chain\_signAddress](https://github.com/pchain-org/pchain/wiki/JSON-RPC#chain_signAddress))
6. `gasPrice`: hex string - (optional, default: 1 gwei) gas price from the request

**Returns**

`hash`, hex string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"tdm_revealVote","params":["0xB3544059698177F14968D29A25AFD0D6D65F4534", "04A77BB50F7D3993CC6485CAABF8FE1980EDAAE88635A1FCB6EFE577D4C10166F0BA4D9C1AC53461FE3332292DDC8594C92E0E4D2C0CEEE0F74D8D67ACD8E391B1", "0x152D02C7E14AF6800000", "tlas", "0x6e5ea219800849592e67f76d45742a29c42a20b0b9d853facf32ac788591869e3db50a10770d88b93f24d2f6efed8acd220bce6442db7a2fbadfdada2d2cde73"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xbbr5b7..."
}
```

### **tdm\_getCurrentEpochNumber**

Returns the current epoch number

**Parameters**

none

**Returns**

`epochNumber`, hex string - current epoch number

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"tdm_getCurrentEpochNumber","params":[],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x0" // Epoch 0
}
```

### **tdm\_getEpoch**

Returns the epoch details

**Parameters**

1. `number`, hex string - epoch number

```
params: [
   "0x0",
]
```

**Returns**

`result`, string - detail of the specific epoch, such as validators, start block, end block, reward per block

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"tdm_getEpoch","params":["0x0"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": {
      "number": "0x0",
      "reward_per_block": "0x454f4a543d46b786",
      "start_block": "0x0",
      "end_block": "0xa0668",
      ...
   }
}
```

### **tdm\_getNextEpochVote**

Returns the votes details of the next epoch

**Parameters**

none

**Returns**

`result`, string - votes detail of the next epoch, such as epoch number, start block, end block, votes

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"tdm_getNextEpochVote","params":[],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": {
    "vote_for_epoch": "0x1",
    "start_block": "0x601",
    "end_block": "0x1182",
    "votes": [
      {
        "address": "0xf4050fe211a5d819fb191a429474f30a00615cf9",
        "public_key": "00B64CC58F49BC1BCE9EE5794F85E6858B88B2AEB9E3B6CB4C4EDC5AFB3597D901187D70975C9A26C52908C9DC4D1334935D33FC18D89A3E858598A4D6C128E165AE684629B5D3595E00CC6D402340DCB60664A9BEFA24FE44CEDAF9A505550D7430CC66C0FE4B6931518DAEA6F639B2BC6A7537D8B68F78A45EF0E9C19ACE82",
        "amount": "0x200",
        "salt": "ABCD",
        "vote_hash": "0x9d861ed720a51396a7ba2b5c05db04924d96ed9e81781641bfbd343d4df3dd0e",
        "tx_hash": "0x919a3b45bbda8f0622515405b2a6ffab2653fef3567c405338f19ab229d65fcc"
      }
    ]
  }
}
```

### **tdm\_getNextEpochValidators**

Returns the validators of the next epoch based on the votes

**Parameters**

none

**Returns**

`result`, DATA - validators of the next epoch, such as address, public key, voting power

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"tdm_getNextEpochValidators","params":[],"id":1}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": [
        {
            "address": "0xf4050fe211a5d819fb191a429474f30a00615cf9",
            "public_key": "00B64CC58F49BC1BCE9EE5794F85E6858B88B2AEB9E3B6CB4C4EDC5AFB3597D901187D70975C9A26C52908C9DC4D1334935D33FC18D89A3E858598A4D6C128E165AE684629B5D3595E00CC6D402340DCB60664A9BEFA24FE44CEDAF9A505550D7430CC66C0FE4B6931518DAEA6F639B2BC6A7537D8B68F78A45EF0E9C19ACE82",
            "voting_power": "0x200"
        }
    ]
}
```

### **tdm\_generatePrivateValidator**

Returns the generated BLS Public/Private Key associate with provided address

**Parameters**

1. `from`: address, 20 Bytes - the address

**Returns**

1. `address`: address, 20 Bytes - address from the request
2. `consensus_pub_key`: hex string, 128 Bytes - the generated BLS Public Key
3. `consensus_priv_key`: hex string, 32 Bytes - the generated BLS Private Key

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"tdm_generatePrivateValidator","params":["0x1234567890123456789012345678901234567890"],"id":1}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "address": "0x1234567890123456789012345678901234567890",
        "consensus_pub_key": "6FDF14270D8346A5D60F2A8503D39529851909F18A35AAB0201E30A31B47A64A6D72F9D3E7D6E880408643EACBEBD16D77AB062EF6BCFBC6F2294A365AE119DD6942111D63D8FD5870D69DC651B8B6C8D7C11FDE51AE5F77846A102C25568619838548F301087A12EA0A0E4FEB6074695B0CA815777FF897F522E5307036A3DE",
        "consensus_priv_key": "B56578D7960C8AB00C1BE6D8D95D9A2424F604549F2F1D965EFACEBAE527A7A1"
    }
}
```

### **del\_delegate**

Create a new transaction to Delegate your balance to Candidate

**Parameters**

1. `from`: address, 20 Bytes - the address who triggers the action
2. `candidate`: address, 20 Bytes - the address of candidate
3. `amount`: hex string - Amount of the Delegate PAI (minimum 1,000 PAI)
4. `gasPrice`: hex string - (optional, default: 1 gwei) gas price from the request

```
params: [
   "0x1529FA43D9F7FE958662F7200739CDC3EC2666C7",
   "0xd833b6738285f4a50cf42cf1a40c4000256589d4",
   "0x3635c9adc5dea00000" // 1000 e+18
]
```

**Returns**

`hash`, hex string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"del_delegate","params":["0x1529FA43D9F7FE958662F7200739CDC3EC2666C7","0xd833b6738285f4a50cf42cf1a40c4000256589d4", "0x3635c9adc5dea00000"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xadef13..."
}
```

### **del\_cancelDelegate**

Create a new transaction to Cancel your Delegation from Candidate

**Parameters**

1. `from`: address, 20 Bytes - the address who triggers the action
2. `candidate`: address, 20 Bytes - the address of candidate
3. `amount`: hex string - Amount of the Delegate PAI
4. `gasPrice`: hex string - (optional, default: 1 gwei) gas price from the request

```
params: [
   "0x1529FA43D9F7FE958662F7200739CDC3EC2666C7",
   "0xd833b6738285f4a50cf42cf1a40c4000256589d4",
   "0x10000"
]
```

**Returns**

`hash`, hex string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"del_cancelDelegate","params":["0x1529FA43D9F7FE958662F7200739CDC3EC2666C7","0xd833b6738285f4a50cf42cf1a40c4000256589d4", "0x10000"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xadef13..."
}
```

### **del\_applyCandidate**

Create a new transaction to become a Candidate (with specific security deposit and commission fee rate)

**Parameters**

1. `from`: address, 20 Bytes - the address who triggers the action
2. `securityDeposit`: hex string - Amount of the security deposit PAI (minimum 10,000 PAI)
3. `commission`: integer - the commission fee percentage of each Block Reward be charged from delegator, when Candidate become a Validator (between 0 - 100)
4. `gasPrice`: hex string - (optional, default: 1 gwei) gas price from the request

```
params: [
   "0xd833b6738285f4a50cf42cf1a40c4000256589d4",
   "0x21e19e0c9bab2400000", // 10,000 e+18
   10
]
```

**Returns**

`hash`, hex string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"del_applyCandidate","params":["0xd833b6738285f4a50cf42cf1a40c4000256589d4", "0x10000", 10],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xadef13..."
}
```

### **del\_cancelCandidate**

Create a new transaction to cancel the Candidate qualification, if the address has deposited proxied balance, it will be refund at the end of epoch, otherwise will be refund immediately

**Parameters**

1. `from`: address, 20 Bytes - the address who triggers the action
2. `gasPrice`: hex string - (optional, default: 1 gwei) gas price from the request

```
params: [
   "0xd833b6738285f4a50cf42cf1a40c4000256589d4"
]
```

**Returns**

`hash`, hex string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"del_cancelCandidate","params":["0xd833b6738285f4a50cf42cf1a40c4000256589d4"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xadef13..."
}
```

### **del\_checkCandidate**

Returns the candidate status of the account of given address.

**Parameters**

1. `from`: address, 20 Bytes - address to check for balance.
2. `blockNumber`: QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending"

```
params: [
   '0xd833b6738285f4a50cf42cf1a40c4000256589d4',
   'latest'
]
```

**Returns**

1. `candidate`: Boolean - Candidate Flag of the given address
2. `commission`: QUANTITY - commission percentage of Candidate Address

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"del_checkCandidate","params":["0xd833b6738285f4a50cf42cf1a40c4000256589d4", "latest"],"id":1}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "candidate": false,
        "commission": 0
    }
}
```

### **eth\_getFullBalance**

Returns the overall balance of the account of given address.

**Parameters**

1. `from`: address, 20 Bytes - address to check for balance.
2. `blockNumber`: QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending"
3. `fullDetail`: Boolean - If true it returns the full detail of proxied/reward object under this address

```
params: [
   '0xd833b6738285f4a50cf42cf1a40c4000256589d4',
   'latest',
   true
]
```

**Returns**

1. `balance`: QUANTITY - integer of the current balance in p-wei.
2. `total_delegateBalance`: QUANTITY - total delegate balance in p-wei to other address
3. `total_depositBalance`: QUANTITY - deposit balance in p-wei for Validator Stake
4. `total_depositProxiedBalance`: QUANTITY - total deposit proxied balance in p-wei for Validator Stake
5. `total_pendingRefundBalance`: QUANTITY - total pending refund balance in p-wei which will be return to delegate at the end of Current Epoch
6. `total_proxiedBalance`: QUANTITY - total proxied balance in p-wei delegate from other address
7. `total_rewardBalance`: QUANTITY - total pending reward balance in p-wei of this address
8. `proxied_detail`: Object - detail record of each address's proxied data, including proxied balance, deposit proxied balance and pending refund balance
9. `reward_detail`: Object - detail record of this address's reward data, including how much balance in p-wei will be given at the end of each epoch

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"eth_getFullBalance","params":["0xd833b6738285f4a50cf42cf1a40c4000256589d4", 100, true],"id":1}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "balance": "0x1000eadf9",
        "proxied_detail": {
            "0x1529fa43d9f7fe958662f7200739cdc3ec2666c7": {
                "ProxiedBalance": "0xb000",
                "DepositProxiedBalance": "0x0",
                "PendingRefundBalance": "0x0"
            },
            "0xd833b6738285f4a50cf42cf1a40c4000256589d4": {
                "ProxiedBalance": "0x152d02c7e14af6800000",
                "DepositProxiedBalance": "0x0",
                "PendingRefundBalance": "0x0"
            }
        },
        "reward_detail": {
            "epoch_0": "0x4c65c629400",
            "epoch_1": "0x4c65c629400",
            "epoch_10": "0x4c65c629400",
            "epoch_11": "0x4c65c629437",
            "epoch_2": "0x4c65c629400",
            "epoch_3": "0x4c65c629400",
            "epoch_4": "0x4c65c629400",
            "epoch_5": "0x4c65c629400",
            "epoch_6": "0x4c65c629400",
            "epoch_7": "0x4c65c629400",
            "epoch_8": "0x4c65c629400",
            "epoch_9": "0x4c65c629400"
        },
        "total_delegateBalance": "0x152d02c7e14af6800000",
        "total_depositBalance": "0x0",
        "total_depositProxiedBalance": "0x0",
        "total_pendingRefundBalance": "0x0",
        "total_proxiedBalance": "0x152d02c7e14af680b000",
        "total_rewardBalance": "0x394c549ef037"
    }
}
```

### **del\_extractReward**

Extract all avaliable reward.

**Parameters**

1. `address`: address, 20 Bytes - address to check for balance.
2. `gasPrice`: `QUANTITY|TAG` -(optional, default: To-Be-Determined) Integer of the gasPrice used for each paid gas

```
params: [
   '0xd833b6738285f4a50cf42cf1a40c4000256589d4',
   '0x3635c9adc5dea00000'
]
```

**Returns**

`hash` hex string - the transaction hash

**Example**

```
// Request
curl -X POST -H "Content-Type:application/json" --data '{"jsonrpc":"2.0","method":"del_extractReward","params":["0xd833b6738285f4a50cf42cf1a40c4000256589d4", '0x3635c9adc5dea00000'],"id":1}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": "0xadef13..."
}
```

#### <br>