[tonylampada]

I'm still not sure what's the best way to defend against that, so I posted a "Ask HN" here: https://news.ycombinator.com/item?id=7246381

Any help is appreciated

[judk]

Instead of relying on transaction hashes, you need to scan the blockchain for any transaction involving the addresses you care about.

Transaction hashes are a misnomer -- the hash is a has of the message, NOT of the transaction. Many messages match one transaction.