Looking for help: I'm building a frame for Arbitrum and I need frame signatures for it

In the docs, it says doing it is "difficult" outside of OP mainnet, but it doesn't say it's impossible. It gives no docs for how this can be done though

Does anybody know?

Co-founder of @PaimaStudios
Working on onchain games, autonomous worlds, zk and L2s.

Also co-founder of @dcspark_io

You ll have to provide a state proof from optimism and verify it onchain on Atrbitrum, you might want (or even need) to use zk to make this efficient

And this is on top of signature verification itself, which require to decode the  packed message onchain too. There is this repo that does the signature verif already: https://github.com/pavlovdog/farcaster-solidity
and he sugges you might want to also use zk here to make it cheaper

Game Designer building Permissionless and persistent game worlds 
-  https://ronan.eth.limo
- https://etherplay.io (@etherplay)
