Syscoin Bridge: How a Proof Parsing Flaw Minted 5 Billion SYS From Nothing

A breakdown of the Syscoin bridge exploit: how an attacker handed the relay a malformed SPV proof that its hand written parser read as a valid burn, minting about 5 billion SYS (~$8.5M) with no real coin burned behind it, and why this is the same proof validation failure that keeps killing burn and mint bridges.