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 0x084b2c7c186450a6ce55af328bcf8ab2521bc836e1772c6fa2c34fbf1e0d0ba0. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ea0535e-7127-4d3f-9ae8-39d3907ae41d.json and https://artists.proofprofile.net/proofs/artist/5ea0535e-7127-4d3f-9ae8-39d3907ae41d.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 0x2ed8e4b88fd9cabea76b624064c3b8deb89fb0797a7936175a86cd85bed72fcb. 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/BC1U32201218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765f87cbb33e7ca6fd1de5fd6b68d14394ac9dd1b3c9521918a1fe587535fcdc. 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/BC1U32201219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b21db8b9ef4cb9fd8ecea4cf96b7082233403fef81752e1a12b26f1929fa8c. 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/BC1U32201222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dad4d1e7675215aae3204e2115f3eca9c8b5efe5193d510de3f423509600023. 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/BC1U32201224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04afa29032e04a88a37ecc93dfed481d4dffae1e59eccb5065487a4995f7c7e9. 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/CAHQJ2546815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8342e5987df6d26d689ad7146c5280e7543960312ac2e41a2f22a321c8e1a857. 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/BCVGM2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1969e16c3e11fcc52987e905ddc8478d0959b307dfde0fb580408e75a5d1e1. 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/GBWUL2477805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669e4ceab6b6f6a581a6066c768ca0d9bf93fb6da79c797df929d64af0b5d628. 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/GXD7V2574649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42aae5f38e9c98deafde316939180552e854cd32987728560a9bbad3a8350564. 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/GXD7V2591550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5a867075375783ff3ba49c8c69b6fe79c86ff793adfea87e38b19635452d3e. 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/BX4KX2400056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e454be94aa567243c660752a61c3ffa12a528789597b18d9e8d5988148bd6f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T16:23:40Z), 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/BX4KX2400057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42625e028930f8c9b680e177cd950aaabc6d8c152273155a393b6e6e58ad12d8. 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/SGW502246462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d32d88bcee20f63668e0146cb745d597ccee30bbe9d822697569dead4e1cba5. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:49:04Z), 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/BX4KX2400058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c51acda3d58e06325d8b15b542cc4b898de8a7a4378049bd1b02cb270f8608. 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/QZNJX2319318.