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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e52d66b8b78ee070dd0219bf0aaa6c7d4264bb5df5ac42d24a7f0b8b764eca2. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d97d9251-16d7-4ab8-9b6d-3145d68615cd.json and https://artists.proofprofile.net/proofs/artist/d97d9251-16d7-4ab8-9b6d-3145d68615cd.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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9420593dd31b4b3e0fcc8da64550360b46194beb5fe68cd814dc1f35a43f3f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZ5AB1898000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1561abab5f59a71e46813d46ecb63ebbd129f82c19c0a80a764aed61cbec3efe. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZ5AB1905028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3538b4442bbc3ea3648821e05a3488cb6cbc1423973a9be6bb041105ec3577. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BXGPM1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc211bcd70544c726a9230eb3b03fa087dfbca08527c873582fadf353843ebe. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BXGPM1900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c99e75d65fe361803ec891bba96eb8b7da36f78814d6aa3cf47f9bd1acd09d9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHZ41938536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8cdfccc59d6f5129ff6c667771946aefbbadaa2b40a75e1a03e7f7d94f3e9c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMZ92024856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3fff890bf5649ba676978ff08df0e7a08faa8eafb519c57c9222c55a6734ca. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNJV2094556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6913d142d071a2b3cf9ab0f75c81eae82f721b07e1cb27a2f04fac9223b793. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZHZ32108409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7801772389c526479b43bc2eab6d6a7555d24edbea31dbcffaf794f8ea3ab372. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BXGPM2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420692ee6428524f6e1fbe52d6ce4d23486a0388d660013f52eb73f2fd04c0d5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNJX2054863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aad8a842cbf260fc3d3eec0fbe6b93c59a2221971bcc0a385e50c46931daaa1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHZ51920665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d3a29312131c7555d50e767a92fa3d780aa1f8f7252f0af856bb898b791f21. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZ5AB2059953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541acd44a41c0608a868498506b82a5c88434ed87ebbaaebb03cc0acf41f450a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJY2164565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b046d6d58098e87f65b3bb4aa0128d88404ee74328cb42686d7b8efe51e9f4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BXGPM2200003.