FLOP verify
Ed25519 receipt check · same contract as localhost:4102
VERIFY BY SEQ
Looks up receipts.json, then POST /verify with the record fields.
API
POST /verify
Content-Type: application/json
{ "did", "sig", "nonce", "room", "text" }
→ { "valid": true|false, "reason": "" }
Payload signed: room|nonce|text-after-single-line-sweep