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 0x23d8b93da3cb275df5e0f843d3b01a3e73cc94563031e9482fead19a57d34ede. 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/82905965-e959-4ce3-a0b2-dab73fd5152f.json and https://artists.proofprofile.net/proofs/artist/82905965-e959-4ce3-a0b2-dab73fd5152f.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 0xa837cc839fd7325af2f8c5a24c492a8df252cc1eb9b2b9085b67eb00346fc5ff. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BX4IU2203532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5afe07000e0ad7567e20a8755267578b1bc84d8bc0af333f8eee6287a5eb7a7. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZTAS2360578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1065049cf9853f764383d11640a0a28e56278fa730a408090c506272bdb9f2d3. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T10:41:02Z), 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/QZTB82313526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb34d21a3c72e28389a0a8ce26121efb0823e50b8c7c27ee0a3a0602f4f8870a. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T22:57:54Z), 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/QZTBD2343951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e883095dce45c24324566e5f86667de40f3ffdd4062b6381a672e6fbb8ff601. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZK6H2413556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e7081e6474737d7b29424ac1d43275d30b3fe58fae7ae331a0666ef915a7fc6. 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/QZTAS2360564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057468278b7d071d4618c269c877a6d1fa3497f81f58d4aef130ecc0e8fdffea. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZWFP2412588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e52afbe20ab0c4368de53f299f36d2eae3cae8e1e833278ae775c943f7ad31. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZZ7W2451789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cdd5f1e2d84224c62183f49167464d068789820bc7a30664f3f8d1d934bebd. 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/QZES62524007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x086052e214cccd30595662e327ea484a560f24e787ecb875d8222761359317ab. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZES62593793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e575b27643bf31596d41d1a731fcd3903a68b9992a625db8ffe57c010d3435e. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZES62526178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48551283238f2f8a42f7091b8e2400ff6c72f81e0783bf60737276066114507e. 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/QZWFK2586212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87c85acc8ae1751b1b9d1d17be5b0c504a432f05d3189b6c29d977178298b6d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFU2527023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd31a597b277eac4ba2c87ce02a86276fabb4d322a2ac31be5630944d9806b9. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:37:52Z), 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/QZWFU2524045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6b9714bb35129009cd4b06d82a5adee50f09b7d1fc15479b483750f5e7d486. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZZ7N2548807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6549eaffab894d019d411a3775950ce48872392a249f070188ed46e1cfbe4d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZZ7S2503653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fab38813028a6d500ad4358bb534c560f0a57f6c8cb1845c0897c57385a48b. 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/QT3EZ2581931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e38cdc8c06e2ebc178f4a0534915150f430d0bf1a6f37136ed3f94ab61230c. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QT3F22593887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf11fdb8f244df479225d99d55908b3e4dd9d82a9575a453d3018df0ce05234b. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T23:16:09Z), 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/QT3F52548328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ac265798ad528ff89814ce457e8e8ad7eecdd2f25d635fc900b9ea4c86e3ca. 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/BKTKU2500087.