A block in blockchain is a data structure that holds batches of transactions, securely linked to form an immutable chain.
Understanding the Block in Blockchain
A block in blockchain technology is a digital ledger entry that records and secures transactions. Each block is connected to the one before and after it, creating a chronological and unbreakable chain of data when joined together.
What is a Block in Blockchain?
Imagine a block as a digital container, akin to a box filled with transaction records—much like a page in a ledger. Once a block reaches its capacity, it’s encrypted, sealed, and linked to the chain, akin to adding another car to a train.
What Information Does a Block Contain?
- The header, which includes metadata such as timestamps and a unique identifier.
- The body, housing a list of transactions with varying data types.
Block sizes differ across blockchains, with Bitcoin’s current block size at 4MB, while others may be larger to hold more transactions.
Enhancing Security with Blocks
Blocks bolster blockchain security. Altering a single block would require changes across all blocks, a near-impossible feat due to the cryptographic linking of blocks via hashes.
Adding New Blocks to the Blockchain
New blocks undergo a verification process using a hash function, creating a unique code that links to the previous block. This ensures any data changes are easily detectable. Blocks are added through consensus mechanisms like proof-of-work or proof-of-stake, where network nodes agree on the block’s contents.