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DevDocs: Block Chain: Overview: Many corrections

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Luke Dashjr 2014-10-01 19:49:05 +00:00
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_includes/guide_block_chain.md
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@ -28,27 +28,25 @@ together. This ensures a transaction cannot be modified without
modifying the block that records it and all following blocks. modifying the block that records it and all following blocks.
Transactions are also chained together. Bitcoin wallet software gives Transactions are also chained together. Bitcoin wallet software gives
the impression that satoshis are sent from and to addresses, but the impression that satoshis are sent from and to wallets, but
bitcoins really move from transaction to transaction. Each standard bitcoins really move from transaction to transaction. Each
transaction spends the satoshis previously spent in one or more earlier transaction spends the satoshis previously received in one or more earlier
transactions, so the input of one transaction is the output of a transactions, so the input of one transaction is the output of a
previous transaction. previous transaction.
![Transaction Propagation](/img/dev/en-transaction-propagation.svg) ![Transaction Propagation](/img/dev/en-transaction-propagation.svg)
A single transaction can spend bitcoins to multiple outputs, as would be A single transaction can create multiple outputs, as would be
the case when sending satoshis to multiple addresses, but each output of the case when sending to multiple addresses, but each output of
a particular transaction can only be used as an input once in the a particular transaction can only be used as an input once in the
block chain. Any subsequent reference is a forbidden double block chain. Any subsequent reference is a forbidden double
spend---an attempt to spend the same satoshis twice. spend---an attempt to spend the same satoshis twice.
Outputs are not the same as Bitcoin addresses. You can use the same
address in multiple transactions, but you can only use each output once.
Outputs are tied to [transaction identifiers (TXIDs)][txid]{:#term-txid}{:.term}, which are the hashes Outputs are tied to [transaction identifiers (TXIDs)][txid]{:#term-txid}{:.term}, which are the hashes
of signed transactions. of signed transactions.
Because each output of a particular transaction can only be spent once, Because each output of a particular transaction can only be spent once,
all transactions included in the block chain can be categorized as either the outputs of all transactions included in the block chain can be categorized as either
[Unspent Transaction Outputs (UTXOs)][utxo]{:#term-utxo}{:.term} or spent transaction outputs. For a [Unspent Transaction Outputs (UTXOs)][utxo]{:#term-utxo}{:.term} or spent transaction outputs. For a
payment to be valid, it must only use UTXOs as inputs. payment to be valid, it must only use UTXOs as inputs.