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This ensures a transaction cannot be modified without modifying the block that records it and all following blocks. Bitcoin wallet software gives the impression that satoshis are sent from and to wallets, but bitcoins really move from transaction to transaction.

Outputs are tied to transaction identifiers (TXIDs), which are the hashes of signed transactions.Because each output of a particular transaction can only be spent once, the outputs of all transactions included in the block chain can be categorized as either Unspent Transaction Outputs (UTXOs) or spent transaction outputs.A single transaction can create multiple outputs, as would be the case when sending to multiple addresses, but each output of a particular transaction can only be used as an input once in the block chain.Any subsequent reference is a forbidden double spend—an attempt to spend the same satoshis twice.This section describes many of the consensus rules used by Bitcoin Core.

The illustration above shows a simplified version of a block chain.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.When several nodes all have the same blocks in their block chain, they are considered to be in consensus.The validation rules these nodes follow to maintain consensus are called consensus rules.Questions about Bitcoin development are best asked in one of the Bitcoin development communities.