Bandersnatch RingVRF

[xlc]

support Bandersnatch RingVRF in the Utils package
may need to wait for it to be ready and use Rust / C++ binding to access the library

https://github.com/w3f/ring-vrf/tree/master/bandersnatch_vrfs
https://github.com/paritytech/polkadot-sdk/blob/master/substrate/primitives/core/src/bandersnatch.rs
https://github.com/davxy/bandersnatch-vrfs-spec/blob/main/example/src/main.rs

[qiweiii]

https://github.com/chinedufn/swift-bridge?tab=readme-ov-file this could be helpful

[qiweiii]

• swift-bridge is nice but unfortunately generated code does not work, added an issue but no response yet
• cbindgen should work as well, but require some work to setup ffi, also with types and pointer handling problems, a poc here for testing whether it works