Failure atlas
Bridge and key failures
When the thing that fails is the set of keys between two chains.
What to keep
A common bridge locks an asset on one chain and issues a representation on another. The signers of that lock are the custodian.
Public post-mortems of bridge losses, including Ronin and Wormhole in 2022, turn on keys, signing thresholds, or verification code. The amounts and the blame belong to those primary write-ups, which this page does not replace.
A diagram of interoperability is not a control.
What this is not
Not a complaint, not a price chart, and not a complete history. Primary sources outrank this summary.