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Author Topic: Parsing your transactions using bitcointools  (Read 1417 times)
Brre
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July 22, 2010, 03:11:23 PM
 #1

Hi,

I am trying to parse the transactions using bitcointools:

I get the following when i parse the wallet:

'TxIn: prev(82df...6428:1), is this the previous transaction? So how do you compute the net transaction value then, do you have to go back the whole chain?
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Gavin Andresen
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July 23, 2010, 02:25:44 AM
 #2

TxIn: prev(82df...6428:1) means the second TxOut of transaction 82df...something...6428  (it abbreviates the full 256-bit transaction hash and starts counting at zero).

To see that transaction:
Code:
gavin$ dbdump.py --transaction=82df...6428
1 tx in, 2 out
['TxIn: prev(bfb0...cd16:1) pubkey: 17muZqKMEFqzefsqYhR9vqBjz1jNVcDcbh sig: 71:3044...0201 65:0480...af42']
['TxOut: value: 0.05 pubkey: 1GVgigFDZ9pPLyYwxboEoaSDMDbsBQPVMx Script: DUP HASH160 20:a9f6...9268 EQUALVERIFY CHECKSIG', 'TxOut: value: 66.07 pubkey: 1LsvDRhoMmH5YeZDAxaP5rqwNTp3xFCF3Q Script: DUP HASH160 20:da0b...a345 EQUALVERIFY CHECKSIG']
This looks like bitnickels coins coming out of the Bitcoin Faucet.  The transaction before THAT is:
Code:
gavin$ dbdump.py --transaction=bfb0...cd16
1 tx in, 2 out
['TxIn: prev(b1dd...5cd9:1) pubkey: 1MQNsNwRHTu7MWPgFRGRRZfo58jU3RGxJv sig: 73:3046...8501 65:041b...6624']
['TxOut: value: 0.05 pubkey: 1GVgigFDZ9pPLyYwxboEoaSDMDbsBQPVMx Script: DUP HASH160 20:a9f6...9268 EQUALVERIFY CHECKSIG', 'TxOut: value: 66.12 pubkey: 17muZqKMEFqzefsqYhR9vqBjz1jNVcDcbh Script: DUP HASH160 20:4a4e...e0c3 EQUALVERIFY CHECKSIG']

To compute the net transaction value, just add up the values of all the TxOuts; they have to equal the sum of all the TxIns (well, unless there are transaction fees).  So for that first transaction, 66.07+0.05 = 66.12 (which is, indeed, bfb0...cd16:1)

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