Too Long; Didn't Read
A blockchain is a chain that is made up of blocks linked together and linked together.
Every block has a head and a body.
A block's head or block header or head of the block is an 80-byte long string and is divided into six parts:
The Bitcoin version number (4-byte)
The hash of the preceding block (32-byte)
The root hash of the Merkle tree (32-byte)
The time in seconds from 1970–01–01 T00: 00 UTC (4-byte)
The difficulty target of the block (4-byte)
The nonce used by miners (4-byte)
Every node in the blockchain network has a copy of the every transaction.
Transactions recorded on the blockchain are a permanent and cannot be changed.
The consensus algorithm is a set of instructions for decision-making on the bitcoin network