Ports the Goblin Name Transfer Protocol v1 into the colocated Floonet name
authority: a seller lodges a signed kind-3402 offer to reassign a name to a
buyer for a Grin price, and the buyer claims it with an on-chain payment proof.
Strictly non-custodial: the buyer pays the seller wallet to wallet, the
authority verifies two artifacts and swaps one names row. Keys never move.
New routes, mounted only when FLOONET_TRANSFERS is set (else they 404):
POST /api/v1/transfer/offer NIP-98 (seller), body {offer}
GET /api/v1/transfer/offer/{id} public, read-limited, CORS *
DELETE /api/v1/transfer/offer/{id} NIP-98 (seller)
POST /api/v1/transfer/claim NIP-98 (buyer), body {offer_id, proof}
Claim verification runs in the spec's order: NIP-98 + replay set, offer exists
(consumed -> idempotent 200 or 409), revoked/expired grace + end_height gate,
buyer key == p tag, seller still owner, both proof signatures over the canonical
73-byte message (amount_BE || excess || sender), recipient address and exact
amount match the offer, kernel confirmed on chain >= min_conf, excess never used
(durable UNIQUE), buyer holds no name (exempt from the name-change cooldown).
The reassignment is one atomic SQLite transaction that also records the transfer,
consumes the offer, and arms the seller's cooldown. The lodge ambiguity rule
keys on proof_address alone among live offers (offer_ambiguous).
The transfer path is fully independent of the fork's GoblinPay paid-names
integration: zero calls into src/paid.rs, no GOBLINPAY_URL dependency, pure
in-process crypto plus the read-only Grin node foreign API. Transfers and paid
names toggle in any combination. Config follows the repo's FLOONET_ pattern
(from_env/validate/summary/for_test), fail-fast when transfers are on without
FLOONET_GRIN_NODE_URL, and is documented in .env.example, docker-compose.yml,
and the us-east env template.
Tests: 27 transfer integration tests (offer state machine, revoke, expiry,
late-claim grace and end_height rules, every claim failure mode with real
ed25519 proofs, successful reassign + idempotent retry + cooldown, plus a
transfers-with-pay-mode-active combination) adapted to tests/http.rs helpers,
plus proof, node and config unit tests. cargo test green (32 + 17 + 27).
2ro
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