Referee Oracle

[irenegia]

Design doc here
https://hackmd.io/XbIc63PdQSq7O3KeDrtfiQ

Miro board here
https://miro.com/app/board/uXjVP_gI2xY=/

[irenegia]

TODOs:

• add to the doc the flows
• review the entire design
• compare with Modular Re-design (Arbitrum) #89 ??

[lucaniz]

TODO:
review how ECDSA recover function operates

Note: It seems thatrecover(hash, signature) always returns an address even if signature is not a legitimate signature for hash (no error message in this case).

Checks to be done:

• how the address is evaluated, especially when the pair (hash, signature) does not verify
• if (and how) the address output by recover is verified