[Bug] Prover puzzle_response, expired puzzle data was received about snarkos HOT 3 OPEN

The prover node would need to keep a minimal view of the chain state to verify the puzzle - what's the current height of the network and what's the block hash of the block before current epoch. The current sync module might not be enough for this, as it can be cheated to some extent.

However, that would mean the node can just locally generate the puzzle.

from snarkos.

Yes, this can only eliminate some epochs that have already expired, and cannot verify malicious behavior.

from snarkos.

The puzzle could be generated directly from the limited chain state, considering you only need the epoch number and the block hash from the last block of the last epoch to construct it. To rigorously verify a block hash though, you do need the full chain (if that's what you mean).

from snarkos.