Daemon JSON RPC API

The daemon JSON RPC is a HTTP server which provides JSON 2.0 RPC interface for interacting with a daemon and a block explorer.

Installation

npm i kryptokrona-rpc

Interacting with the API

API endpoint example

http://localhost:11898/json_rpc

Configuration and Instantiation

To start the Daemon JSON RPC API server at http://localhost:11898/json_rpc, run:

kryptokrona --rpc-bind-port=11898

To make the server accessible from another computer, use the --rpc-bind-ip 0.0.0.0 switch.

kryptokrona --rpc-bind-ip=0.0.0.0 --rpc-bind-port=11898

To enable block explorer API access (like for getblocks, gettransactionpool, etc.), use the --enable-blockexplorer switch.

kryptokrona --enable-blockexplorer

The above given switches can be combined to achieve remote access with block explorer methods as shown below.

kryptokrona --enable-blockexplorer --rpc-bind-ip=0.0.0.0 --rpc-bind-port=11898

This would make the RPC server accessible at

http://<your ip address>:11898/json_rpc

and, locally at

http://localhost:11898/json_rpc

To make a JSON RPC request to your Daemon RPC you should use a GET request that looks like this:

http://<service address>:<service port>/json_rpc

Parameter	Description
<service address>	IP of Daemon RPC, if it is located on local machine it is either 127.0.0.1 or localhost
<service port>	Daemon RPC port, by default it is bound to 11898 port, but it can be manually bound to any port you want

const kryptokrona = require('kryptokrona-rpc').kryptokrona

const daemon = new kryptokrona({
  host: '0.0.0.0', // ip address or hostname of the kryptokrona host
  port: 11898, // what port is the RPC server running on
  timeout: 2000, // request timeout
  ssl: false // whether we need to connect using SSL/TLS
})

getblockcount

getblockcount() method returns the current chain height.

No Input.

Output

Argument	Description	Format
count	Current chain height	int
status	Status of request	string

curl -d '{"jsonrpc":"2.0", "method":"getblockcount", "params":{}}' http://localhost:11898/json_rpc

daemon.getBlockCount().then((blockCount) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output

{
    "jsonrpc":"2.0",
    "result":{
        "count":560915,
        "status":"OK"
    }
}

getblockhash

getblockhash() method returns block hash for a given height off by one.

Input

Argument	Mandatory	Description	Format
height	Yes	The height of the block whose previous hash is to be retrieved.	int

Output

Argument	Description	Format
result	Hash of previous block	int

curl -d '{"jsonrpc":"2.0","method":"on_getblockhash","params":[123456]}' http://localhost:11898/json_rpc

daemon.getBlockHash({
  height: 500000
}).then((blockHash) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
    "jsonrpc":"2.0",
    "result":"4bd7d..."
}

getblocktemplate

getblocktemplate(reserve_size, addr) method returns blocktemplate with an empty "hole" for nonce.

Input

Argument	Mandatory	Description	Format
reserve_size	Yes	Size of the reserve to be specified	int
wallet_address	Yes	Valid kryptokrona wallet address	String

Output

Argument	Description	Format
blocktempate_blob	Blocktemplate with empty "hole" for nonce	string
difficulty	Difficulty of the network	int
height	Chain height of the network	int
reserved_offset	Offset reserved	int
status	Status of the network	string

curl -d '{"jsonrpc":"2.0","method":"getblocktemplate","params":{"reserve_size":200,"wallet_address":"TRTLxxxx..."}}' http://localhost:11898/json_rpc

daemon.getBlockTemplate({
  reserveSize: 200,
  walletAddress: 'TRTLv1pacKFJk9QgSmzk2LJWn14JGmTKzReFLz1RgY3K9Ryn7783RDT2TretzfYdck5GMCGzXTuwKfePWQYViNs4avKpnUbrwfQ'
}).then((blockTemplate) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
	"jsonrpc": "2.0",
	"result": {
		"blocktemplate_blob": "0100de...",
		"difficulty": 65563,
		"height": 123456,
		"reserved_offset": 395,
		"status": "OK"
	}
}

submitblock

submitblock(block_blob) method submits mined block.

Input

Argument	Mandatory	Description	Format
block_blob	Yes	Block blob of the mined block	string

Output

Argument	Description	Format
status	Status of request	string

curl -d '{"jsonrpc":"2.0","method":"submitblock","params":["0100b...."]}' https://localhost:11898/json_rpc

daemon.submitBlock({
  blockBlob: '...'
}).then((result) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
	"jsonrpc": "2.0",
	"result": {
		"status" : "OK"
	}
}

getlastblockheader

getlastblockheader method returns the block header of the last block.

No Input

Output

Argument	Description	Format
block_size	size of the block	int
depth	height away from the known top block	int
difficulty	difficulty of the last block	int
hash	hash of the last block	string
height	height of the last block	int
major_version	-	int
minor_version	-	int
nonce	-	int
num_txs	Number of transactions in the block	int
orphan_status	whether the last block was an orphan or not	bool
prev_hash	hash of the previous block	string
reward	reward of the block	str
timestamp	the time at which the block is occured on chain since Unix epoch	int
status	status of the request	string

curl -d '{"jsonrpc":"2.0","method":"getlastblockheader","params":{}}' http://localhost:11898/json_rpc

daemon.getLastBlockHeader().then((result) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
    "jsonrpc":"2.0",
    "result":{
        "block_header":{
            "block_size":86171,
            "depth":0,
            "difficulty":431119113,
            "hash":"b746b...",
            "height":561342,
            "major_version":4,
            "minor_version":0,
            "nonce":715846563,
            "num_txes":4,
            "orphan_status":false,
            "prev_hash":"b8e02...",
            "reward":2930801,
            "timestamp":1529750993
        },
        "status":"OK"
    }
}

getblockheaderbyhash

getblockheaderbyhash() returns block header by given block hash

Input

Argument	Mandatory	Description	Format
hash	Yes	Hash of the block	string

Output

Argument	Description	Format
block_size	size of the block	int
depth	height away from the known top block	int
difficulty	difficulty of the requested block	int
hash	hash of the requested block	string
height	height of the requested block	int
major_version	-	int
minor_version	-	int
nonce	-	int
num_txs	Number of transactions in the block	int
orphan_status	whether the requested block was an orphan or not	bool
prev_hash	hash of the previous block	string
reward	reward of the block	str
timestamp	the time at which the block is occured on chain since Unix epoch	int
status	status of the request	string

curl -d '{"jsonrpc":"2.0","method":"getblockheaderbyhash","params":{"hash":"30706..."}}' http://localhost:11898/json_rpc

daemon.getBlockHeaderByHash({
  hash: '7d6db7b77232d41c19d898e81c85ecf08c4e8dfa3434f975a319f6261a695739'
}).then((result) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
    "jsonrpc":"2.0",
    "result":{
        "block_header":{
            "block_size":11640,
            "depth":437898,
            "difficulty":70050782,
            "hash":"30706...",
            "height":123456,
            "major_version":3,
            "minor_version":0,
            "nonce":3177228614,
            "num_txes":3,
            "orphan_status":false,
            "prev_hash":"4bd7d...",
            "reward":2969487,
            "timestamp":1516631879
        },
    "status":"OK"
    }
}

getblockheaderbyheight

getblockheaderbyheight() method returns block header by given block height

Input

Argument	Mandatory	Description	Format
height	Yes	Height of the block	int

Output

Argument	Description	Format
block_size	size of the block	int
depth	height away from the known top block	int
difficulty	difficulty of the requested block	int
hash	hash of the requested block	string
height	height of the requested block	int
major_version	-	int
minor_version	-	int
nonce	-	int
num_txs	Number of transactions in the block	int
orphan_status	whether the requested block was an orphan or not	bool
prev_hash	hash of the previous block	string
reward	reward of the block	str
timestamp	the time at which the block is occured on chain since Unix epoch	int
status	status of the request	string

curl -d '{"jsonrpc":"2.0","method":"getblockheaderbyheight","params":{"height":123456}}' http://localhost:11898/json_rpc

daemon.getBlockHeaderByHeight({
  height: 502345
}).then((result) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
    "jsonrpc":"2.0",
    "result":{
        "block_header":{
            "block_size":11640,
            "depth":437898,
            "difficulty":70050782,
            "hash":"30706...",
            "height":123456,
            "major_version":3,
            "minor_version":0,
            "nonce":3177228614,
            "num_txes":3,
            "orphan_status":false,
            "prev_hash":"4bd7d...",
            "reward":2969487,
            "timestamp":1516631879
        },
    "status":"OK"
    }
}

getcurrencyid

getcurrencyid() method returns unique currency identifier.

No Input

Output

Argument	Description	Format
currency_id_blob	unique currency identifier	string

curl -d '{"jsonrpc":"2.0","method":"getcurrencyid","params":{}}' http://localhost:11898/json_rpc

daemon.getCurrencyId().then((result) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
    "jsonrpc":"2.0",
    "result":{
        "currency_id_blob":"7fb97..."
    }
}

getblocks

getblocks() method returns information on the last 30 blocks from height (inclusive)

Input

Argument	Mandatory	Description	Format
height	Yes	height of the last block to be included in the result.	int

Output

Argument		Description	Format
status		status of the request	string
blocks	Array of

     | cumul_size   | size of the block                     | int
     | difficulty   | difficulty of the block               | int
     | hash         | hash of the block                     | string
     | height       | height of the block                   | int
     | timestamp    | the time at which the block is occured on the chain since Unix epoch | int
     | tx_count     | number of transactions in the block   | int

curl -d '{"jsonrpc":"2.0","method":"f_blocks_list_json","params":{"height":500000}}' http://localhost:11898/json_rpc

daemon.getBlocks({
  height: 500000
}).then((blocks) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
    "jsonrpc": "2.0",
    "result": {
        "blocks":[
            {
                "cumul_size": 22041,
                "difficulty": 285124963,
                "hash": "62f00...",
                "height": 500000,
                "timestamp": 1527834137,
                "tx_count": 4
            }
        ],
        "status": "OK"
    }
}

getblock

getblock() method returns information on a single block

Input

Argument	Mandatory	Description	Format
hash	Yes	hash of the block	string

Output

Argument	Description	Format
alreadyGeneratedCoins	total number of coins generated in the network upto that block	string
alreadyGeneratedTransactions	total number of transactions present in the network upto that block	int
baseReward	calculated reward	int
block_size	size of the block	int
depth	height away from the known top block	int
difficulty	difficulty of the requested block	int
effectiveSizeMedian	fixed constant for max size of block	int
hash	hash of the requested block	string
height	height of the requested block	int
major_version	-	int
minor_version	-	int
nonce	-	int
orphan_status	whether the requested block was an orphan or not	bool
penalty	penalty in block reward determined for deviation	float
prev_hash	hash of the previous block	string
reward	total reward of the block after removing penalty	str
sizeMedian	calculated median size from last 100 blocks	int
timestamp	the time at which the block is occured on chain since Unix epoch	int
totalFeeAmount	total fees for the transactions in the block	int
transactions	Array of transactions in the block	array
transactionsCumulativeSize	total sum of size of all transactions in the block	int
status	status of the request	string

Transaction Attributes:

Argument	Description	Format
amount_out	output amount of the transaction	int
fee	fees for the transaction	int
hash	hash of the transaction	string
size	size of the transaction	int

curl -d '{"jsonrpc":"2.0","method":"f_block_json","params":{"hash":"980ff..."}}' http://localhost:11898/json_rpc

daemon.getBlock({
  hash: 'f11580d74134ac34673c74f8da458080aacbe1eccea05b197e9d10bde05139f5'
}).then((block) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
    "jsonrpc":"2.0",
    "result":{
        "block":{
            "alreadyGeneratedCoins":"1659188157030",
            "alreadyGeneratedTransactions":1097221,
            "baseReward":2930784,
            "blockSize":384,
            "depth":1,
            "difficulty":264289473,
            "effectiveSizeMedian":100000,
            "hash":"980ff...",
            "height":561537,
            "major_version":4,
            "minor_version":0,
            "nonce":60779,
            "orphan_status":false,
            "penalty":0.0,
            "prev_hash":"c37f8...",
            "reward":2930784,
            "sizeMedian":265,
            "timestamp":1529757254,
            "totalFeeAmount":0,
            "transactions":[
                {
                    "amount_out":2930784,
                    "fee":0,
                    "hash":"c0a2d...",
                    "size":265
                }
            ],
            "transactionsCumulativeSize":265
        },
        "status":"OK"
    }
}

gettransaction

gettransaction() method returns information on single transaction.

Input

Argument	Mandatory	Description	Format
hash	Yes	hash of the transaction	string

Output

Argument	Description	Format
block	details of the block in which transaction is present	json object
status	status of the request	string
tx	sub-transactions in the transaction	json object
txDetails	details of the transaction	json object

Block attributes:

Argument	Description	Format
cumul_size	size of the block	int
difficulty	difficulty of the block	int
hash	hash of the block	string
height	height of the block	int
timestamp	the time at which the block is occured on chain since Unix epoch	int
tx_count	number of transactions in the block	int

Transaction Details attributes:

Argument	Description	Format
amount_out	total amount present in the transaction	int
fee	total fees of the transaction	int
hash	hash of the transaction	string
mixin	mixin of the transaction	int
paymentId	payment Id of the transaction	string
size	total size of the transaction	int

Transaction attributes:

Argument	Description	Format
extra	Transaction extra which can be any information in hex	string
unlock_time	delay in unlocking the amount	int
version	-	int
vin	array of input transactions	array
vout	array of output transactions	array

curl -d '{"jsonrpc":"2.0","method":"f_transaction_json","params":{"hash":"702ad..."}}' http://localhost:11898/json_rpc

daemon.getTransaction({
  hash: '702ad5bd04b9eff14b080d508f69a320da1909e989d6c163c18f80ae7a5ab832'
}).then((transaction) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
    "jsonrpc":"2.0",
    "result":{
        "block":{
            "cumul_size":22041,
            "difficulty":106780143,
            "hash":"62f00...",
            "height":500000,
            "timestamp":1527834137,
            "tx_count":4
        },
        "status":"OK",
        "tx":{
            "extra":"019e4...",
            "unlock_time":500040,
            "version":1,
            "vin":[
                {
                    "type":"ff",
                    "value":{
                        "height":500000
                    }
                }
            ],
            "vout":[
                {
                    "amount":80,
                    "target":{
                        "data":{
                            "key":"5ce69..."
                        },
                        "type":"02"
                    }
                }
            ]
        },
        "txDetails":{
            "amount_out":2936280,
            "fee":0,
            "hash":"702ad...",
            "mixin":0,
            "paymentId":"",
            "size":266
        }
    }
}

gettransactionpool

gettransactionpool() returns the list of transaction hashes present in mempool

No Input

Output

Argument	Description	Format
status	status of the request	string
transactions	array of transactions in mempool	array

Transactions attributes:

Argument	Description	Format
amount_out	output amount of the transaction	int
fee	fees for the transaction	int
hash	hash of the transaction	string
size	size of the transaction	int

curl -d '{"jsonrpc":"2.0","method":"f_on_transactions_pool_json","params":{}}' http://localhost:11898/json_rpc

daemon.getTransactionPool().then((transactions) => {
  // do something
}).catch((error) => {
  // do something
})

Expected Output:

{
    "jsonrpc":"2.0",
    "result":{
        "status":"OK",
        "transactions":[
            {
                "amount_out":8990,
                "fee":10,
                "hash":"a5e88...",
                "size":541
            }
        ]
    }
}

License

The content in this document was originally written by the Bytecoin (BCN) Developers. It is licensed under the CC BY SA 3.0 license. The source material can be found at the Bytecoin Wiki.

Also of note, kryptokrona developers have altered and adapted the content to suit our implementation of the API. This was done independently of the Bytecoin development team. They neither endorse or acknowledge our changes. Feel free to adopt or change our content as per the CC BY SA 3.0 license requirements.