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unspent = [ OutputInfo("ebadfaa92f1fd29e2fe296eda702c48bd11ffd52313e986e99ddad9084062167", 1, 8000000), OutputInfo("6596fd070679de96e405d52b51b8e1d644029108ec4cbfe451454486796a1ecf", 0, 16050000), OutputInfo("b2affea89ff82557c60d635a2a3137b8f88f12ecec85082f7d0a1f82ee203ac4", 0, 10000000), OutputInfo("7dbc497969c7475e45d952c4a872e213fb15d45e5cd3473c386a71a1b0c136a1", 0, 25000000), OutputInfo("55ea01bd7e9afd3d3ab9790199e777d62a0709cf0725e80a7350fdb22d7b8ec6", 17, 5470541), OutputInfo("12b6a7934c1df821945ee9ee3b3326d07ca7a65fd6416ea44ce8c3db0c078c64", 0, 10000000), OutputInfo("7f42eda67921ee92eae5f79bd37c68c9cb859b899ce70dba68c48338857b7818", 0, 16100000), ] if len(argv) > 1: target = long(argv[1]) else: target = 55000000 print "For transaction amount %d Satoshis (%f bitcoin) use: " % (target, target/10.0**8) print select_outputs_greedy(unspent, target) if __name__ == "__main__": main() 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: Example 5-4. Running the select-utxo.py script $ python select-utxo.py 50000000 For transaction amount 50000000 Satoshis (0.500000 bitcoin) use: ([<7dbc497969c7475e45d952c4a872e213fb15d45e5cd3473c386a71a1b0c136a1:0 with 25000000 Satoshis>, \ <7f42eda67921ee92eae5f79bd37c68c9cb859b899ce70dba68c48338857b7818:0 with 16100000 Satoshis>, \ <6596fd070679de96e405d52b51b8e1d644029108ec4cbfe451454486796a1ecf:0 with 16050000 Satoshis>],\ 'Change: 7150000 Satoshis') Once the UTXO is selected, the wallet then produces unlocking scripts containing sig‐ natures for each of the UTXO, thereby making them spendable by satisfying their lock‐ ing script conditions. The wallet adds these UTXO references and unlocking scripts as inputs to the transaction. Table 5-3. The structure of a transaction input Size 32 bytes 4 bytes 1-9 bytes (VarInt) Variable 4 bytes Field Transaction Hash Output Index Unlocking-Script Size Unlocking-Script Sequence Number Description Pointer to the transaction containing the UTXO to be spent The index number of the UTXO to be spent, first one is 0 Unlocking-Script length in bytes, to follow A script that fulfills the conditions of the UTXO locking-script. Currently-disabled Tx-replacement feature, set to 0xFFFFFFFF Transaction Outputs and Inputs | 119PDF Image | Mastering Bitcoin
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