Example Unreal Project/Verify signedTypeData_v3 Signature in web3.unreal about hyperplay-desktop-client

[BrettCleary]

I will use the formulas outlined here https://medium.com/metamask/eip712-is-coming-what-to-expect-and-how-to-use-it-bb92fd1a7a26 along with the bitcoin core elliptic curve C library https://github.com/bitcoin-core/secp256k1 for ecdsa signature verification and https://github.com/nayuki/Bitcoin-Cryptography-Library/blob/master/cpp/Keccak256.cpp for the keccack256 hash used on the typed data prior to verification.

This way, the game dev does not have to deploy a smart contract and we have no external dependencies/infrastructure to maintain. These libraries are optimized and well maintained too. It'll be very fast.

This also prevents us from dealing with MITM attacks on external http calls so security is better too.

[jacobc-eth]

Outstanding:

Add signature method using SignTypedData v3

[BrettCleary]

Still investigating options as to where to verify the signature

[BrettCleary]

Work in progress here: G7DAO/web3.unreal#1.

[BrettCleary]

Investigating smart contract wallet signing compatibility (e.g. https://eips.ethereum.org/EIPS/eip-1271) as well

[BrettCleary]

This is finished and merged with an example in the FPS_Demo uproject. We can't verify smart contract wallet signatures but I'm not sure if we can request them anyways. Something to revisit in the future.