Device-to-device audio communication (think QR codes, but made out of sound) seems very underrated. Much better UX than QR codes or NFC because you don't have to worry about putting your phone in the exactly right place or pointing it in the right direction.

Anyone here with more detailed takes on this?

Maybe something like an OpenDime for ETH, that may not have a display for a QR code, and that you wouldn't want to hand to a counterparty for them to scan an NFC to validate the contents?

Instead, the counterparty's mobile wallet can transmit a nonce, and the OpenDime can respond with its address and a signed message.

Farcaster OG | Anime, NFTs, and Anime NFTs | Techno-Superflatist | Channels: /weeb3 /nihonto

Of course, a downside would be that this OpenDime would need a battery, mic and speaker