One option are keyed-verification anonymous credentials like used in WabiSabi. There's one implementation by nostr:nprofile1qqsfuv8fgq3cek0ta0rr9qtkm4x3pxqjz22y9u4xcwrj0lrxlfl2jzspz4mhxue69uhhyetvv9ujuerpd46hxtnfduhszrnhwden5te0dehhxtnvdakz7qgswaehxw309ahx7um5wghx6mmd9uv87spp: https://github.com/lontivero/cashabi
Yup, the any-amount ecash will be based on KVAC also used in WabiSabi and Signal! The mint only needs a single private key, and the entire wallet can be stored in just a single nut. All that while also vastly improving privacy (blinded amounts, like confidential transactions).
It's going to be so fucking beautiful 🥹
🥹
It's easily the biggest change in Cashu we ever attempted but it's worth it.
