getBlockTemplate

GetBlockTemplate

Gets a block template for use with mining software.

Parameters

  1. capabilities: (array of enum): client side supported feature. Note: coinbasetxn and coinbasevalue are mutually exclusive.
    • coinbasetxn information for coinbase transaction, miningaddr is required in node config.
    • coinbasevalue maximum allowable input to coinbase transaction

Returns

(object, capabilities=["coinbasetxn"])
  • stateroot: (string) the root of the final state trie of the block.
  • curtime: (numeric) current timestamp in seconds since epoch (Jan 1 1970 GMT).
  • height: (numeric) the height of the block in the block DAG.
  • blues: (numeric) blue set size of block’s past set,
  • previousblockhash: (string) The merkle root of the previous parent blocks (the dag layer)
  • sigoplimit: (numeric) limit of sigops in blocks
  • sizelimit: (numeric) limit of block size
  • weightlimit: (numeric) limit of block weight
  • parents: (array of object) list of parent hashes
    • data: (string) parent hash encoded in hexadecimal (byte-for-byte)
    • hash: (string) parent hash encoded in little-endian hexadecimal
  • transactions: (array of object) list of transaction
    • data: (string) transaction data encoded in hexadecimal (byte-for-byte)
    • hash: (string) hash encoded in little-endian hexadecimal (including witness data)
    • depends: (array of numeric) transactions before this one (by 1-based index in ‘transactions’ list) that must be present in the final block if this one is
    • fee: (numeric) difference in value between transaction inputs and outputs (in QITs); for coinbase transactions, this is a negative Number of the total collected block fees (ie, not including the block subsidy); if key is not present, fee is unknown and clients MUST NOT assume there isn’t one
    • sigops: (numeric) total SigOps cost, as counted for purposes of block limits; if key is not present, sigop cost is unknown and clients MUST NOT assume it is zero
    • weight: (numeric) total transaction weight, as counted for purposes of block limits
  • version: (numeric) The preferred block version
  • coinbaseaux: (object) data that should be included in the coinbase’s scriptSig content
    • flags: (string) key name is to be ignored, and value included in scriptSig
  • coinbasevalue: (numeric) maximum allowable input to coinbase transaction, including the generation award and transaction fees (in QITs)
  • longpollid: (string) template ID, the format is “parent root - generate time”
  • pow_diff_reference: (object) - mining difficulty
    • blake2bd_bits: (string): double blake2b compressed target of next block,
    • blake2bd_target: (string): double blake2b hash target of next block,
    • cuckaroo_min_diff: (numeric): cuckaroo min difficulty
    • cuckatoo_min_diff: (numeric): cuckatoo min difficulty
  • maxtime: (numeric) The maximum timestamp appropriate for next block time in seconds since epoch (Jan 1 1970 GMT)
  • mintime: (numeric) The minimum timestamp appropriate for next block time in seconds since epoch (Jan 1 1970 GMT)
  • mutable: (array of string) list of ways the block template may be changed, including ‘time’, ‘transactions/add’, ‘prevblock’, “coinbase/append”
  • noncerange :(string) A range of valid nonces
  • capabilities :(array of string) list of capabilities, not implemented yet, only ‘proposal’ always listed
(object, capabilities=["coinbasevalue"]) - best block hash

almost identical to result of capabilities = coinbasevalue, just coinbasevalue and coinbaseaux substituted with coinbasetxn

  • coinbasetxn: (object) information for coinbase transaction, data structure is identical to transactions field

Example

Request
curl --data '{"method":"getBestBlockHash","params":[],"jsonrpc":"2.0","id":1}' -s -k -u "rpcuser:rpcpass"  -H 'Content-Type: application/json' http://127.0.0.1:18131
Response
{
    "stateroot": "0000000000000000000000000000000000000000000000000000000000000000",
    "curtime": 1578717731,
    "height": 34902,
    "blues": 37478,
    "previousblockhash": "000028f561e25022c4c0bbf1b08943da39ef1a134556c742a5b2c8accd3d3fd6",
    "sigoplimit": 80000,
    "sizelimit": 1048576,
    "weightlimit": 4000000,
    "parents": [
      {
        "data": "d63f3dcdacc8b2a542c75645131aef39da4389b0f1bbc0c42250e261f5280000",
        "hash": "000028f561e25022c4c0bbf1b08943da39ef1a134556c742a5b2c8accd3d3fd6"
      }
    ],
    "transactions": [],
    "version": 11,
    "coinbasetxn": {
      "data": "0100000001905e3ac0bc4050ce1ba4c4b4fc6cef8f2d6a8e1e3b49917ca65641b0feb21c20ffffffffffffffff01007841cb020000001976a914a6b8fe2348fad076b7fd1b34b7e5b35db96dc2a088ac0000000000000000011703568800082ad99948a98c989f092f7169746d6565722f",
      "hash": "fcb7e486a557dbe69b8bd0bf2f5602fb8c22ee2ddc6ad4a5070a8c261f182ede",
      "depends": [],
      "fee": 0,
      "sigops": 1,
      "weight": 0
    },
    "longpollid": "000028f561e25022c4c0bbf1b08943da39ef1a134556c742a5b2c8accd3d3fd6-1578717731",
    "pow_diff_reference": {
      "blake2bd_bits": "1c1fffff",
      "blake2bd_target": "000000001fffff00000000000000000000000000000000000000000000000000",
      "cuckaroo_min_diff": 12718848,
      "cuckatoo_min_diff": 1856
    },
    "maxtime": 1578724931,
    "mintime": 1578717707,
    "mutable": [
      "time",
      "transactions/add",
      "prevblock",
      "coinbase/append"
    ],
    "noncerange": "00000000ffffffff",
    "capabilities": [
      "proposal"
    ]
  }
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