getblockheader "blockhash" ( 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. blockhash (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):
{ (json object)
"hash" : "hex", (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" : "hex", (string) The block version formatted in hexadecimal
"merkleroot" : "hex", (string) The merkle root
"time" : xxx, (numeric) The block time expressed in UNIX epoch time
"mediantime" : xxx, (numeric) The median block time expressed in UNIX epoch time
"nonce" : n, (numeric) The nonce
"bits" : "hex", (string) The bits
"difficulty" : n, (numeric) The difficulty
"chainwork" : "hex", (string) Expected number of hashes required to produce the current chain
"nTx" : n, (numeric) The number of transactions in the block
"previousblockhash" : "hex", (string, optional) The hash of the previous block (if available)
"nextblockhash" : "hex" (string, optional) The hash of the next block (if available)
}
Result (for verbose=false):
"hex" (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/