getblockheader JSON-RPC command

getblockheader "hash_or_height" ( verbose )

If verbose is false, returns a string that is serialized, hex-encoded data for blockheader 'hash'.
If verbose is true, returns an Object with information about blockheader <hash>.

Arguments

1. "hash_or_height"    (string, required) The block hash or block height
2. verbose             (boolean, optional, default=true) true for a json object, false for the hex-encoded data

Result (for verbose = true)

{
  "hash" : "hash",     (string) the block hash (same as provided)
  "confirmations" : n,   (numeric) The number of confirmations, or -1 if the block is not on the main chain
  "height" : n,          (numeric) The block height or index
  "version" : n,         (numeric) The block version
  "versionHex" : "00000000", (string) The block version formatted in hexadecimal
  "merkleroot" : "xxxx", (string) The merkle root
  "time" : ttt,          (numeric) The block time in seconds since epoch (Jan 1 1970 GMT)
  "mediantime" : ttt,    (numeric) The median block time in seconds since epoch (Jan 1 1970 GMT)
  "nonce" : n,           (numeric) The nonce
  "bits" : "1d00ffff", (string) The bits
  "difficulty" : x.xxx,  (numeric) The difficulty
  "chainwork" : "0000...1f3"     (string) Expected number of hashes required to produce the current chain (in hex)
  "nTx" : n,             (numeric) The number of transactions in the block.
  "previousblockhash" : "hash",  (string) The hash of the previous block
  "nextblockhash" : "hash",      (string) The hash of the next block,
  "ablastate" : {        (json object, optional) The block's ABLA state
    "epsilon" : n,       (numeric) ABLA state epsilon value
    "beta" : n,          (numeric) ABLA state beta value
    "blocksize" : n,     (numeric) The size of this block
    "blocksizelimit" : n,        (numeric) The size limit for this block
    "nextblocksizelimit" : n,    (numeric) The size limit for the next block
  }
}

Result (for verbose=false)

"data"             (string) A string that is serialized, hex-encoded data for block 'hash'.

Examples

> bitcoin-cli getblockheader 1000
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getblockheader", "params": [1000] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/
> bitcoin-cli getblockheader '"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09"'
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getblockheader", "params": ["00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09"] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/

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Bitcoin Cash Node Daemon version v27.1.1-1ce1d89

Documentation on docs.bitcoincashnode.org reflects the current master branch in Git, and may include API changes that are not yet present in the latest release.