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Persist wallet state (addresses, utxos, history, indices, fees) as a NIP-44
encrypted, parameterized-replaceable event (kind 30078) addressed to self on
relay.coinos.io. The Nostr identity is derived from the same seed (NIP-06), so
no extra secret. On load we pull the latest state from Nostr — a device with
no local cache gets full state without re-scanning, and another device's
updates propagate — using savedAt to keep the newest copy. localStorage stays
as the instant/offline cache; state is published (debounced) on every change.
(Relay note: added kind 30078 to the strfry write-policy allowlist on prod.)
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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