2

I am writing transaction monitoring service but I am having some problems with listing since block hash. I have bitcoind daemon and when I execute listTransactions some transactions have same block hash so if I would try to listSinceBlock I would have problems. How this all works?

3

The block hash identifies a block. A block can contain multiple transactions, so listsinceblock lists all transactions in blocks newer than the given block hash.

So f.e., if you have this block structure:

block 5 hash: qwertyyuiop
|   tx100,tx101,tx102,tx103
v
block 6 hash: asdfghjklkl
|   tx104,tx105,tx106,tx107,tx108
v
block 7 hash: zxcvbnmnbvc
    tx109,tx110,tx111

When you would do listsinceblock qwertyyuiop, you would get all transactions in blocks older than block 5, so tx104 all the way up to tx111.

2
  • How long one block hash last? So how often is block hash changed?
    – gorgi93
    May 8 '13 at 13:09
  • The hash of a block does never change. It's its identifier, every block has a unique block hash. May 8 '13 at 17:52

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