Blokkfejléc

Blokkfejléc, also known as block header, is a crucial component in the structure of a blockchain. It contains metadata about a block in the blockchain, including information about the transactions it contains and the state of the blockchain at the time the block was created. The block header typically includes the following elements:

1. Previous Block Hash: A reference to the hash of the previous block in the chain, which ensures the integrity and continuity of the blockchain.

2. Merkle Root: A hash that summarizes all the transactions in the block, providing a concise representation of the block's contents.

3. Timestamp: The time at which the block was created, which helps in maintaining the chronological order of the blockchain.

4. Difficulty Target: A value that determines the computational effort required to mine the block, which helps in controlling the rate at which new blocks are added to the blockchain.

5. Nonce: A random value that miners use to find a valid hash for the block, which satisfies the difficulty target.

The block header is essential for the functioning of the blockchain, as it enables nodes to verify the validity of the blocks and maintain the consistency of the distributed ledger. It also plays a critical role in the consensus mechanism of the blockchain, as it helps in reaching an agreement among the network participants on the state of the blockchain.