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UTXO are tracked by every full node bitcoin client in a database held in memory, called the UTXO set or UTXO pool. New transactions consume (spend) one or more of these outputs from the UTXO set. Transaction outputs consist of two parts: • An amount of bitcoin, denominated in satoshis, the smallest bitcoin unit • A locking script, also known as an “encumbrance” that “locks” this amount by spec‐ ifying the conditions that must be met to spend the output The transaction scripting language, used in the locking script mentioned above, is dis‐ cussed in detail in “Transaction Scripts and Script Language” on page 123 Table 5-2. The structure of a transaction output Size 8 bytes 1-9 bytes (VarInt) Variable Field Amount Locking-Script Size Locking-Script Description Bitcoin Value in Satoshis (10-8 bitcoin) Locking-Script length in bytes, to follow A script defining the conditions needed to spend the output In the example below, we use the blockchain.info API to find the unspent outputs (UT‐ XO) of a specific address: Example 5-1. A script that calls the blockchain.info API to find the UTXO related to an address # get unspent outputs from blockchain API import json import requests # example address address = '1Dorian4RoXcnBv9hnQ4Y2C1an6NJ4UrjX' # The API URL is https://blockchain.info/unspent?active= # It returns a JSON object with a list "unspent_outputs", containing UTXO, like this: #{ "unspent_outputs":[ #{ # "tx_hash":"ebadfaa92f1fd29e2fe296eda702c48bd11ffd52313e986e99ddad9084062167", # "tx_index":51919767, # "tx_output_n": 1, # "script":"76a9148c7e252f8d64b0b6e313985915110fcfefcf4a2d88ac", # "value": 8000000, # "value_hex": "7a1200", # "confirmations":28691 # }, # ... #]} 116 | Chapter 5: TransactionsPDF Image | Mastering Bitcoin
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