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unspent output from every transaction in the blockchain. This allows a wallet to con‐ struct transaction inputs as well as to quickly verify incoming transactions as having correct inputs. However, since a full-index client takes up a lot of disk space, most user wallets run “lightweight” clients that track only the user’s own unspent outputs. If the wallet application does not maintain a copy of unspent transaction outputs, it can query the bitcoin network to retrieve this information, using a variety of APIs available by different providers, or by asking a full-index node using the bitcoin JSON RPC API. Below we see an example of a RESTful API request, constructed as an HTTP GET command to a specific URL. This URL will return all the unspent transaction outputs for an address, giving any application the information it needs to construct transaction inputs for spending. We use the simple command-line HTTP client cURL to retrieve the response: Look up all the unspent outputs for Alice’s bitcoin address. $ curl https://blockchain.info/unspent?active=1Cdid9KFAaatwczBwBttQcwXYCpvK8h7FK { "unspent_outputs":[ { ] } } "tx_hash":"186f9f998a5...2836dd734d2804fe65fa35779", "tx_index":104810202, "tx_output_n": 0, "script":"76a9147f9b1a7fb68d60c536c2fd8aeaa53a8f3cc025a888ac", "value": 10000000, "value_hex": "00989680", "confirmations":0 The response above shows that the bitcoin network knows of one unspent output (one that has not been redeemed yet) under the ownership of Alice’s address 1Cdid9KFAaatwczBwBttQcwXYCpvK8h7FK. The response includes the reference to the transaction in which this unspent output is contained (the payment from Joe) and its value in Satoshis, at 10 million, equivalent to 0.10 bitcoin. With this information, Alice’s wallet application can construct a transaction to transfer that value to new owner ad‐ dresses. Use the following link to look up the transaction from Joe to Alice: https://blockchain.info/tx/ 7957a35fe64f80d234d76d83a2a8f1a0d8149a41d81de548f0a65a8a999f6f18 Constructing a Transaction | 23PDF Image | Mastering Bitcoin
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