getblockheader - Bitcoin RPC

getblockheader "hash" ( 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"          (string, required) The block hash
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)
  "previousblockhash" : "hash",  (string) The hash of the previous block
  "nextblockhash" : "hash",      (string) The hash of the next block
}

Result (for verbose=false):
"data"             (string) A string that is serialized, hex-encoded data for block 'hash'.

Examples:
> 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/

This is a website, created out of frustration with uncomplete and outdated Bitcoin Core RPC documentation online.

It was inspired by ChainQuery, which seems to be abandoned. These docs are even simplier, so they can be regenerated by anyone.

Bitcoin version: 0.16.0.

Note that the RPC is from a regtest node (for completeness), so it includes some additional calls that a regular node doesn't have.

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