I've heard of that on nostr:nprofile1qqsxpfwtq34xpnqy9djsg7jjayq3rrst95r4xflje0nqlwjjwhfhrycpzpmhxue69uhkumewwd68ytnrwghszxthwden5te0wfjkccte9eekummjwsh8xmmrd9skctcpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhse6ztph actually. I've thought the US would adopt that prior to this election with Trump but never heard back. Next elections then!  

 It's been around for 3 years, or at least in development since then. They presented at Bitcoin 2021 or 2022. I used to follow this project and talk to them on the blue bird app.