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 0x89f1b4de4d16a284e974885a6c2f66f8680359c8a851f426b6a0146038b0d827. 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/e27bc74b-f1af-4d4f-8896-52c6e3d14aed.json and https://artists.proofprofile.net/proofs/artist/e27bc74b-f1af-4d4f-8896-52c6e3d14aed.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 0x2dbc30562116323ee3a4c0c3dc41a266d897c0365d4ff47da3941542ffb49bbe. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/USA2P1869862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea16b0f1bbf693b9bfdf440a98da8538e9099facc4c49d4475cceff24c6ba2a2. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/USA2P1869864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7145a4ee141af6d5520e0818fc0aaf91fe857f122e2a914a74996ed7d1ae37b5. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/USA2P1869866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a468c0c4ad3d4252208ab20765569e058751ff096f3c1df8d75789d685f615. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USA2P1869869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974937a2a0aba10761a30fb29b7b5815a9a2f5e32b585d8b9b3a3da6100a04aa. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FRX452135250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2231b1e3f6172919c52e0c774c45fe93cd9572836d6d3e101ada36a85ca1e28. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/FRX452135251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a8b24d8c5977af05135a03d3af7b9c006e71b117308cd837e38bd68e6020db. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX452135252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4959c9d33261b0dfaafcfc34044f716c927df8ed10709a5a11ce3436bc2b2ec4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRX452135254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe77c41662c6ad30199a2ae60b299312ce2f1e4d052816172115630428ad100. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FRX452135255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd7fd6c7642533f698b3d1784b70f208b9252c1ae98b874932cecd110265f18. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/FRX452135256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974937a2a0aba10761a30fb29b7b5815a9a2f5e32b585d8b9b3a3da6100a04aa. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX452135250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2231b1e3f6172919c52e0c774c45fe93cd9572836d6d3e101ada36a85ca1e28. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/FRX452135251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a8b24d8c5977af05135a03d3af7b9c006e71b117308cd837e38bd68e6020db. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRX452135252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4959c9d33261b0dfaafcfc34044f716c927df8ed10709a5a11ce3436bc2b2ec4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FRX452135254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd7fd6c7642533f698b3d1784b70f208b9252c1ae98b874932cecd110265f18. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/FRX452135256.