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drusselloctal@gmail.com 2014-10-30 13:18:15 -07:00
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@ -153,9 +153,9 @@ Transaction outputs associate a specific amount (in satoshis) to a specific _enc
In simple terms, transaction inputs are pointers to UTXO. They point to a specific UTXO by reference to the transaction hash and sequence number where the UTXO is recorded in the blockchain. To spend UTXO, a transaction input also includes unlocking scripts that satisfy the spending conditions set by the UTXO. The unlocking script is usually a signature proving ownership of the bitcoin address that is in the locking script. In simple terms, transaction inputs are pointers to UTXO. They point to a specific UTXO by reference to the transaction hash and sequence number where the UTXO is recorded in the blockchain. To spend UTXO, a transaction input also includes unlocking scripts that satisfy the spending conditions set by the UTXO. The unlocking script is usually a signature proving ownership of the bitcoin address that is in the locking script.
When a user makes a payment, their wallet constructs a transaction by selecting from the available UTXO. For example, to make a 0.015 bitcoin payment, the wallet app may select a 0.01 UTXO and a 0.005 UTXO, using them both to add up to the desired payment amount. When users make a payment, their wallet constructs a transaction by selecting from the available UTXO. For example, to make a 0.015 bitcoin payment, the wallet app may select a 0.01 UTXO and a 0.005 UTXO, using them both to add up to the desired payment amount.
In the example below, we show the use of a "greedy" algorithm to select from available UTXO in order to make a specific payment amount. In the example, the available UTXO are provided as a constant array, but in reality, the available UTXO would be retrieved with an RPC call to Bitcoin Core, or to a third-party API as shown in <<get_utxo>>. In <<select_utxo>>, we show the use of a "greedy" algorithm to select from available UTXO in order to make a specific payment amount. In the example, the available UTXO are provided as a constant array, but in reality, the available UTXO would be retrieved with an RPC call to Bitcoin Core, or to a third-party API as shown in <<get_utxo>>.
[[select_utxo]] [[select_utxo]]
.A script for calculating how much total bitcoin will be issued .A script for calculating how much total bitcoin will be issued
@ -166,7 +166,7 @@ include::code/select-utxo.py[]
---- ----
==== ====
If we run the select-utxo.py script without a parameter it will attempt to construct a set of UTXO (and change) for a payment of 55000000 Satoshis (0.55 bitcoin). If you provide a target payment amount as a parameter, the script will select UTXO to make that target payment amount. Below, we run the script trying to make a payment of 0.5 bitcoin or 50000000 Satoshis: If we run the _select-utxo.py_ script without a parameter, it will attempt to construct a set of UTXO (and change) for a payment of 55,000,000 satoshis (0.55 bitcoin). If you provide a target payment amount as a parameter, the script will select UTXO to make that target payment amount. In <<select_utxo_run>>, we run the script trying to make a payment of 0.5 bitcoin or 50,000,000 satoshis.
[[select_utxo_run]] [[select_utxo_run]]
.Running the select-utxo.py script .Running the select-utxo.py script