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A block is a chunk of data consisting of transactions, and in the context of a blockchain, blocks reference their prior blocks in order, forming a sequential list or chain. Beyond this, details such as the type of data stored within a block, block size, the rules determining how blocks are validated and how blocks link with each other can vary between blockchains and blockchain-like systems. Common block components include a block header, a block creation timestamp, the previous block's hash, the nonce, the software version, the merkle root, the difficulty, and the number of transactions contained within the block.