We (PrivKey) just open sourced a REST gateway that makes Taproot Assets work in browsers (CORS support + auto auth). Zero overhead, and includes a comprehensive test suite.

Feedback/contributions welcome!

https://github.com/privkeyio/taproot-assets-rest-gateway

Building a Bridge to Taproot Assets

https://privkey.substack.com/p/building-a-bridge-to-taproot-assets