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 0xb316b5d0908a48b30bd1b1b041160bf340f6a7e62cb55bf62b01ea382fcf077d. 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/fdabc6d6-8322-4eaa-97a1-2f359c1939c4.json and https://artists.proofprofile.net/proofs/artist/fdabc6d6-8322-4eaa-97a1-2f359c1939c4.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 0x38f181d2a8990704606e2727b6087ccc602bd46908b42c62ad4935bfff1337aa. 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/QZFZ52076558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1564630314bc1a02a2a027f192d5145c60cbe464403d2e214b604d2b76f33a24. 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/QZFZ52076559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe119d735db7089e1bd6fbdbe354bcfc38d86a324b0e9c2037593cd2460875e80. 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/QZFZ52076560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167a5b919250cf98ad266c956fc5c0cefa3c83260860f90ef3abc3f674d4f40e. 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/QZFZ52076561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dadad410dd0f48d08b3d0c7f669a5b026471445b038fc96041c45fb9e91073c. 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/QZFZ52076562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509cf388aeed93ba0c877a8f28a99dd2878aab68289613b47c1251b80f5f9241. 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/QZFZ52076563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c8f2a2607ed006b135aec0ee54ab71c42b83de1a59acb2c5fb85a676e98e09. 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/QZFZ52076564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7fd6d772aa55e9e71fb22f8d823a4f2cae4eb3f0be211956d64f705d9f7a12. 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/QZFZ52076565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64839c2a8ec97e64dfdaa63f7833422519cc75361799ea000d1d549aa1123be2. 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/QZFZ52076566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd514c2e8e64b60a510abe0a01798c65da01e184d9796a6f5b592eef07933868d. 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/QZFZ52076567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af8f89888d23616eecf7cd4445f5edd10455e3129ab211ff913f8ae441955cd. 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/QZFZ52076568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed4797011aa1e7731b95d9df0005848235ea8bd44f6d4e0d1600510b83cccbd. 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/QZFZ52076569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34806a194dd789532e9e6849130d4320b819145ca2c8d9463778eafe84f657f3. 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/QZFZ52076570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81ab4eddf725a1a59246f398f837f4e20be0f846571a96f364ad54ac338c373. 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/QZFZ52076571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c255bb951021695c7a8409c7ff9f23d8eef4009d9861034dbb9a0e92adf514c. 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/QZFZ52087011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675ec9450451143b495bf072de8c1a6215ef5ac2b7be23608979135052c7fc17. 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/QZFZ52087012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295db28c03c234c0e5f9351d3b7b07b441f6616890c9b6d1eeaa8d4c22842491. 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/QZFZ52087013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d752dfae5602a75b5175d42a3c6f103b2ed30522a7af206ae5125e3f78eb421. 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/QZFZ52087014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50817ed6eb28329d35c185b220b757b00938ce2201dd3d3aa28efc0549335774. 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/QZFZ52087015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4889a88795ed4da0d9feaf045b9287f84b661b2bc91ea8ea2dbf6d81097695be. 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/QZFZ52087016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f6dc92dca377b84421a3be902df8822df74559228f4ce07da83766b4a1d55d. 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/QZFZ52087017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852cfce4653f2a6c7dd01d450fb9fb4e70279a2549a8f2ff4ce781d77f01de4a. 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/QZFZ52087018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107ae959cff3e10d9402579e89601d55c61d5d2bd0e8819148c49691132349f7. 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/QZFZ52087019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4ad06f3017791b973e44afecde653ee4f08a522c374feccd09e2a4e1af4128. 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/QZFZ52087020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0a9e52ac1274837958aa7234248ab237b532602842d344365704584986255f. 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/QM2PV1764158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850898493baca1c277b63459f46a24192e6dc251fefd1253853866bd16a630d7. 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/QM2PV1764159.