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 0x108fa3bcfb0551e751f90774b1a3caa48055a95a240a5cf3b492d349969f1e78. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5aab89bf-3b22-4f3f-97cb-5cc5196cbb33.json and https://artists.proofprofile.net/proofs/artist/5aab89bf-3b22-4f3f-97cb-5cc5196cbb33.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 0x26d819f84ff628861a237fa3e81c6f35951326f0cfb67ed2d8d4a1566e4b14d0. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/BE27E1400100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f3bb871c8c759f009e258ed22a44a3aab5ffa99d1d1d1480674d8a121d1a96. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/BE27E2402510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f58e5a5087bc3bed569420a3781555833d314345790cc8922235c3762b00cf. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/BE27E2402550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f3bb871c8c759f009e258ed22a44a3aab5ffa99d1d1d1480674d8a121d1a96. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/BE27E2402510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e48be94d169bb719dce20f8ad574d4330e8b4e6fa11fbab3c015500af83c02. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/BE27E2402560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f58e5a5087bc3bed569420a3781555833d314345790cc8922235c3762b00cf. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:30:32Z), 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/BE27E2402550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d51f59d7c67cd089d8e65bc7562a1c46d714385a8649e868dcedbd6b6c7714. 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/BE27E2402530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3176847f1f3658f7dbb074612cea599ebbe709cd24663988783955e14e387734. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:24:35Z), 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/BE27E2402570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385224954fcd3b9996ac61b3680a93a6fda7d08d61c9580c4268c6e024d1eba9. 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/BE27E2402480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1286b688e8a43fb6860eeb2ecbe80204584b2382a5f00df1060cc7032d0c14. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BE27E2402590.