thumb|260px|Arnaut in Cairo, a painting by Jean-Léon Gérôme thumb|260px|Prayer in the house of an Arnaut chief, by Jean-Léon Gérôme, 1857. Arnaut () is a Turkish ethnonym used to denote Albanians. Ar
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 0x8d92c77df52dd505d09f7066c6bc6fb2966bda260b9b8f9c38a34c06877d222a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aa0d5f48-822d-4028-a722-366bcf7b49e4.json and https://artists.proofprofile.net/proofs/artist/aa0d5f48-822d-4028-a722-366bcf7b49e4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868476295a9b3478e5c4c77c7529266caf1336c544ca584595547ddac5a6a968. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:21:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE5IB2310459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662ccaa9a5164c3dd231edda979c22a6627953e12e2afd3e624a492d31023023. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE5IB2310467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e95dd8fb5c73a4f1a57ef314f475d2f5fbb030a5d237ca14fc7b089feeaa498. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-17T02:01:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE5IB2310475.