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What are the main principles and/or patterns programmers must apply to their code in order to make their programs bulletproof towards transaction malleability attacks?

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Use two tables for deposits basically.

insert deposits into one table with a unique hash. store sighash and txid with a unique hash and timestamp in the other. when the txid changes, you update the second table, preventing the duplicate deposit.

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    @DougPeters no problem. its all about spreading awareness in the community. the stronger the developers, the stronger the economy. i've nver had a problem with it because i don't rely on wallet notify to store transactions, instead i dump an array of the last 100 transactions every 30 seconds iterate through it checking against the db(type receive), only crediting once the confirm > 6. this has performance drawbacks of course, and requires an extra script to periodically check already paid deposits(for changes in txhash and # of confirmations. – r3wt Apr 4 '14 at 18:06
  • i will opensource this solution soon, which is written in php/mysql, and it should be easily ported to other languages/configurations. – r3wt Apr 4 '14 at 18:07
  • Will you handle deposits per address or per transaction? When a transaction pays to multiple addresses in your wallet for example. – Robert-Reinder Nederhoed Apr 23 '14 at 8:42

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