Sign & Verify Message: NanoUtils vs. NanoDart

[cbrunnkvist]

I just finished a Dart implementation of the NOMS signature format in appditto/nanodart, with the grand intention of eventually getting it into Cake Wallet, to either complement or replace the current "sign message" (NOT blocks) implementation - which I suspected came straight from nanodart.

But oh, I was wrong.

CW's relevant pubspec.yaml uses perishllc/nanoutil instead, and through a git-commit reference.

I frankly haven't looked that closely yet at what nanoutil adds over nanodart, so, if anyone familiar with Cake Wallet's use of the library could enlighten me what I should do ... then, please, enlightify 😅

[cbrunnkvist]

Alright, I asked Claude in the meantime for a breakdown of differences, and they stated this:

Feature	nanodart	nanoutil
Standard seed → key/address	✅	✅ (wraps)
BIP39/BIP44 HD derivation	❌	✅
Amount formatting (NANO/BAN/NYANO)	❌	✅
Message signing/verification	❌	✅
Pure-Dart Ed25519 verify	❌	✅
Multi-currency enum routing	❌	✅

So, for Cake Wallet, I guess the HD derivation support is almost certainly the deciding factor. Why it also lists "Message signing", when there already is a "detached()" in nanodart, I do not understand.