Data Fields of Bitcoin Block

This section describes data fields of Bitcoin block.

A Bitcoin block has the following fields expressed in JSON format:

  "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
  "size" : n,            (numeric) The block size
  "strippedsize" : n,    (numeric) The block size excluding witness data
  "weight" : n           (numeric) The block weight as defined in BIP 141
  "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
  "tx" : [               (array of string) The transaction ids
     "transactionid"     (string) The transaction id
  "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" :,  (numeric) The difficulty
  "chainwork" : "xxxx",  (string) Expected number of hashes required to produce 
                                  the chain up to this block (in hex)
  "previousblockhash" : "hash",  (string) The hash of the previous block
  "nextblockhash" : "hash"       (string) The hash of the next block

Let's take a look at the block # 500 from Bitcoin Test Network:

C:\>\local\bitcoin-0.15.1\bin\bitcoin-cli -testnet getblockhash 500

C:\>\local\bitcoin-0.15.1\bin\bitcoin-cli -testnet getblock
  "hash": "00000000a2424460c992803ed44cfe0c0333e91af04fde9a6a97b468bf1b5f70",
  "confirmations": 748456,
  "strippedsize": 1868,
  "size": 1868,
  "weight": 7472,
  "height": 500,
  "version": 1,
  "versionHex": "00000001",
  "merkleroot": "dd3f288510dd3b632940bd3fb1db162d3ff99b19ddb0c586cfa3ac9a76d42517",
  "tx": [
  "time": 1296746771,
  "mediantime": 1296746565,
  "nonce": 2325411586,
  "bits": "1d00ffff",
  "difficulty": 1,
  "chainwork": "000000000000000000000000000000000000000000000000000001f501f501f5",
  "previousblockhash": "000000008cd4b1bdaa1278e3f1708258f862da16858324e939dc650627cd2e27",
  "nextblockhash": "00000000c7f50b6dfac8b8a59e11b7e62f07fdef20597089b9c5d64ebfe6d682"

As you can see this block stores 7 transactions.

Last update: 2018.

Table of Contents

 About This Book

 Introduction of Bitcoin

 Bitcoin Blockchain

 Bitcoin Wallet

 Bitcoin Core

 Bitcoin Transaction

 Bitcoin-Qt - Bitcoin Core GUI

Bitcoin Data Structure

Data Fields of Bitcoin Block

 Merkle Root of Bitcoin Block

 Verify Merkle Root with Python

 Data Structure of Bitcoin Block

 "getblock blockhash 0" - Serialized Hex Blcok Data

 Block Hash Calculation Algorithm

 Block Hash Calculation in Python


 PDF Printing Version