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 0x4cf4403c43b595d9b5779747371a17d57eedc0a2eae6bb7764f0683b4bea9f48. 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/074b22da-69e1-4546-966a-cabacf03e9d9.json and https://artists.proofprofile.net/proofs/artist/074b22da-69e1-4546-966a-cabacf03e9d9.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 0x99ad504f9f55f5d6c581d76cc9f5bd651d8e8e5c4255f05503cfa4b3296d88f9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWV2360161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283ec08fac9f9ccda06dbcf3533a57beb54c7ea95cea9053eb7773b3c662e368. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWV2360162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab57fbaba03af59fa49e5cb3ff3672ebad0ac7326d3b145597a8cdcc91d9067. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWV2360163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2be268d17e948a802359a81d6b505934bfe2f41f9fdc0c0fed95fa1eb294c62. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWV2360164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625a890f1781a920e49fbe283ffd76fc57e8bf04b4919099793cb1eba5b5afdc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWV2360165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf99213dded3bc5e5e9be68206b3a68b5dc5fa6f1cc7a1c994e541773e252ee. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWV2360166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39707e88d768499c9a64b3ba23b059bd1ff2ac53937e0845ccc2834d9850e659. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWV2360167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d67938e22b44b9602b6fcc5655c03f130f2ff5fc2c8bc47f2b6aa22a4d46b82. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWV2360168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3223f224cd2ac26622f9b13f65a7d18343f5221258571cbef5e5fe045cde59c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWV2360169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2095f82f6abd91cb489d9d7e52cfcbb49f8de8ebdb96f2998ca8010d6f03c319. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US3DF2458960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e0c571223d9ea0cff5c7a169cf2e8c965ae6b8939c0b0efe27e9158e781b01. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZDA52408951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e5385271f06a4931b634a39a8d071949e428f75c34a32d8616574ce29d00c3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWFE2333864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4190d65cd3b6b0efe266650234ab688ea64b87041ae7395f5218fe96a82f1ed. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAHJ2356612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b951f6449eae2eecf16680b5542462798445d9caec76bc11dd9e604bd664e21. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNMZ2279474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376fd8dd2790fe794d58877770e2ba8843b91082828f1e8d1f1905d7754cfcaf. 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/QZNMV2225586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5252bbc931745254fb371d068574d172d181b281a70b1f864fd0e6413a494bb3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNMT2206739.