Nostr discovery - #1
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Add nostr.md describing addressable offer events (kind 38421), encrypted wrap request/response (kinds 21821/21822), NIP-13 request proof of work, optional LN node attestation and anonymous identity proof of work, per-provider fees and limits, cheapest-first client selection, and configurable nostr relays with working defaults. Document the privacy model (provider sees the invoice it pays but not the payer; cf. Kappos et al., USENIX Security 2021) and reuse the base protocol request/response bodies so HTTP and nostr share an implementation.
LND's AddHoldInvoice API exposes no blinded-path generation, and lnproxy must use hold invoices to learn the preimage, so an LND-only relay cannot fulfill wrap_bolt11_blinded or wrap_bolt12. State that relays must only advertise wrap_* features they can fulfill and must error otherwise.
Align the offer expiration recommendation with the reference relay, clarify that clients use a ~1h created_at freshness window independent of NIP-40, note that || is byte concatenation in the identity proof of work, and point to the Go and JavaScript reference implementations.
Document that the same payment hash legitimately appears on both the proxy and original payments (including when the original destination is the payer), why this is safe for the relay (CLTV timeline, not destination distinctness), and the requirement to keep a non-zero CLTV margin and refuse to pay out below it.
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See lnproxy/lnproxy-relay#31