Larrosa is an unpopulated settlement and a former municipality of Spain, belonging to the present municipality of Jaca, in the comarca of Jacetania, province of Huesca, Aragon. Geography Larrosa is
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b23d8fb8d93ed90cc0686fb3c4c8efa69b327a254d77a941bbabdff1c1076f. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9056ffdc-2518-4287-bc6c-48a95ec721d8.json and https://artists.proofprofile.net/proofs/artist/9056ffdc-2518-4287-bc6c-48a95ec721d8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).