Arcos or ARCOS can refer to: Places Brazil Arcos, Minas Gerais, in Brazil Portugal Arcos de Valdevez, a municipality in the Viana do Castelo District Arcos (Anadia), a civil parish in the municip
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 0x5b6f7016472f924b6eb1119b35dbd0bee27f8b7f2153e823147cb3fe4c84f354. 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/82fe902b-29e1-494f-b9b2-e12925d84726.json and https://artists.proofprofile.net/proofs/artist/82fe902b-29e1-494f-b9b2-e12925d84726.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).