What do Blocks have in Blockchain?

A block in the blockchain usually contains some information, including:

1. Block number: A unique identifier indicating where a block is in the blockchain order.
2. Timestamp: The time when the block was created and added to the blockchain.
3. Nonce: A randomly generated number that is used in the mining process to solve cryptographic puzzles and validate blocks.
4. Hash: A unique digital fingerprint of the contents of a block generated using a hash function. The hash of each block includes the hash of the previous block, which creates a block chain that is difficult to change.
5. Merkle tree roots: A data structure that summarizes the transactions included in a block, enabling efficient verification of block content.
6. Transaction data: List of transactions that have been validated and added to the block.

The contents of a block can vary depending on the implementation of the particular blockchain, but this is some of the most common information included in a block. Each block is linked to the previous block in the chain, creating a secure and tamper-resistant ledger of transactions.