archipelagoandClaude Opus 5
59fffc809f
Demo images / Build & push demo images (push) Failing after 2m15s
Until now every Cashu proof this node held was backed by a secret drawn from OsRng and written to exactly one file. Losing wallet/ecash.json lost the coins outright — no phrase to write down, and nothing the mint could do about it. Ecash is a bearer instrument, so "one file, no backup" was the sharpest edge in the wallet. NUT-13 derives each proof's secret and blinding factor from (seed, keyset id, counter) instead. The wallet becomes a phrase, and the coins can be re-derived and re-claimed — here or in any other NUT-13 wallet. The phrase is its own 24 words, derived from the node master seed over a fixed HKDF path. Both halves matter: it is still covered by the node's recovery phrase, so there is nothing extra to write down; but it is portable, so restoring ecash into Minibits or cdk-cli does not mean handing over the key to the entire node. It sits on disk unencrypted, deliberately. The master seed needs the operator's password to open, which no background mint or swap can ask for; and this file lives beside wallet/ecash.json, which already holds spendable bearer secrets in plaintext. It regenerates exactly those secrets, so it is the same sensitivity class as the file next to it. 0600, like identity/nostr_secret, which is derived and persisted the same way. Counters are reserved *before* the mint call and never rolled back. A gap costs a restore scan a few extra probes; a reused counter costs a coin, because two proofs with the same secret can only be spent once. Restore is the half that cannot be done offline: a re-derived secret is not money until the mint's signature over it exists. /v1/restore returns those signatures; unblinding reconstitutes the proofs. It is additive and idempotent — coins already held are skipped by secret, spent ones are counted but not added — so it is safe to press on a working wallet, which is when someone is most likely to reach for it. Existing nodes activate on the first visit to Settings → Ecash backup phrase: that password prompt is the only moment the master seed can legitimately be opened. New nodes get it at onboarding. Until then the behaviour is exactly as before — valid proofs, no backup — and the card says so rather than implying a backup already exists. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
12 lines
236 B
Rust
12 lines
236 B
Rust
// WIP Cashu/ecash wallet — many helpers defined for future callers.
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#![allow(dead_code)]
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pub mod ark_client;
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pub mod bdhke;
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pub mod cashu;
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pub mod ecash;
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pub mod fedimint_client;
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pub mod mint_client;
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pub mod nut13;
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pub mod profits;
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