In Blockchain- Block Header part Includes: Block Version, Merkle tree root hash, Previous block hash, NBITS, NOUNCE, ANDS Time Stamp.
Block Body part includes transaction data like txid.
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01. Block Version: The block version number indicates which set of block validation rules to follow.
02. Merkle Trees: The merkle root is constructed using all the TXIDs of transactions in this block, but first the TXIDs are placed in order as required by the consensus rules:
The coinbase transaction’s TXID is always placed first.
Any input within this block can spend an output which also appears in this block (assuming the spend is otherwise valid). However, the TXID corresponding to the output must be placed at some point before the TXID corresponding to the input. This ensures that any program parsing block chain transactions linearly will encounter each output before it is used as an input.
If a block only has a coinbase transaction, the coinbase TXID is used as the merkle root hash.
If a block only has a coinbase transaction and one other transaction, the TXIDs of those two transactions are placed in order, concatenated as 64 raw bytes, and then SHA256(SHA256()) hashed together to form the merkle root.
03. Previous Block Hash: A SHA256(SHA256()) hash in internal byte order of the previous block’s header. This ensures no previous block can be changed without also changing this block’s header.
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04. NBITS: An encoded version of the target threshold this block’s header hash must be less than or equal to.
05. Nounce: An arbitrary number miners change to modify the header hash in order to produce a hash less than or equal to the target threshold. If all 32-bit values are tested, the time can be updated or the coinbase transaction can be changed and the merkle root updated.
06.TimeStamp: The block time is a Unix epoch time when the miner started hashing the header (according to the miner). Must be strictly greater than the median time of the previous 11 blocks. Full nodes will not accept blocks with headers more than two hours in the future according to their clock.
What Makes Blockchain Different:
01. No central authority
02. Verifiability and audibility
03. Dcenterlization or DISINTERMEDITATION
04. Confiedinaliuty and Integrity
05. Robustness
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