piuk,
Just to let you know that
https://blockchain.info/unspent?active=15Y9AuWpDgwh2V5Rp8ZHmeBsNkbpfUH61M

incorrectly shows tx_hash: 4424f571f663f115b8111428606db4a180eeea350ed6dd8db556a9365b4d78c8
whereas it should be :        c8784d5b36a956b58dddd60e35eaee80a1b46d60281411b815f163f671f52444

seems like byte order problem.