Data Structure of Bitcoin Raw Transaction Format

This section describes the data structure of a Bitcoin raw transaction format.

A Bitcoin raw transaction format has the following data structure:

Bytes   Name         Description

4       version      Transaction version number; currently version 1. 
                     Programs creating transactions using newer consensus 
                     rules may use higher version numbers.
Varies  tx_in_count  Number of inputs in this transaction.
Varies  tx_in        Transaction inputs. 
Varies  tx_out_count Number of outputs in this transaction.
Varies  tx_out       Transaction outputs. 
4       lock_time    A time (Unix epoch time) or block number. 

The "tx_in" represents a list of transaction inputs in a non-coinbase transaction. See next tutorial on the "tx_in" structure of a coinbase transaction. Each transaction input has the following data structure:

Bytes  Name             Description

36     previous_output  The previous outpoint being spent, 
                        consisting of a 32-byte TXID and a 4-byte output 
                        index number (vout).
Varies script bytes     The number of bytes in the signature script. 
Varies signature script A script-language script which satisfies the 
                        conditions placed in the outpoint’s pubkey script. 
                        Should only contain data pushes; see the signature 
                        script modification warning.
4      sequence         Sequence number. Default for Bitcoin Core and 
                        almost all other programs is 0xffffffff.

The "tx_out" represents a list of transaction outputs. Each transaction output has the following data structure:

Bytes   Name             Description

8       value            Number of satoshis to spend. May be zero; the sum
                         of all outputs may not exceed the sum of satoshis 
                         previously spent to the outpoints provided in the 
                         input section. 
1+      pk_script bytes  Number of bytes in the pubkey script. 
Varies  pk_script        Defines the conditions which must be satisfied to 
                         spend this output.

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 Mining

 Bitcoin Consensus Rules

 Bitcoin Block Data Structure

Bitcoin Transaction Data Structure

 Data Properties of Bitcoin Transaction

Data Structure of Bitcoin Raw Transaction Format

 Decode Bitcoin Raw Transaction Format

 Data Structure of Coinbase Transaction

 Calculate Transaction ID

 blockexplorer.com API

 Copay - Bitcoin Wallet

 References

 PDF Printing Version