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Outputs are tied to transaction identifiers (TXIDs), which are the hashes of signed transactions.

The block chain provides Bitcoin’s public ledger, an ordered and timestamped record of transactions.

The proof of work used in Bitcoin takes advantage of the apparently random nature of cryptographic hashes.

A good cryptographic hash algorithm converts arbitrary data into a seemingly-random number.

Questions about Bitcoin development are best asked in one of the Bitcoin development communities.

Errors or suggestions related to documentation on can be submitted as an issue or posted to the bitcoin-documentation mailing list.

If the data is modified in any way and the hash re-run, a new seemingly-random number is produced, so there is no way to modify the data to make the hash number predictable.

To prove you did some extra work to create a block, you must create a hash of the block header which does not exceed a certain value.

A block of one or more new transactions is collected into the transaction data part of a block.