self-custod

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ndssigner / ur-tones

Bitcoin PSBTs and seeds as telephone tones (DTMF): UR parts over an audio cable or through the air. Draft spec, reference implementation and an offline web tool for Sparrow and air-gapped signers.

audio bitcoin offline-first dtmf hardware-wallet data-over-sound psbt air-gapped seedsigner sparrow-wallet bc-ur self-custod

Updated Oct 9, 2026
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