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 0x600e489ffb04ae272f65004cae68bf512f8d4cd65cb722fbd2630f6f44b75ad1. 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/f8e6387a-f680-4b11-a0fa-aac99f6f26fd.json and https://artists.proofprofile.net/proofs/artist/f8e6387a-f680-4b11-a0fa-aac99f6f26fd.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 0xb88973f753e1409fa39005dde4d452725df6aad57a1543d6fd7035229f5b8ee4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZARB1892558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ad51da55c7bd04680e124e77bbfe93d3d9587afda63a779bedf30c173915b42. 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/QZES71804789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3d6dfc66f87b99dc258805571b7d488f0de7434c9b41f58e1a09a7bc3b2d60. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZES51954462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed2dbde65803b4da14b7edb37608a2e7bc4644bfae871cf123f28c0578184a2. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZFYX1960869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa462bc7d7215efdac33eac9fb636e81f09cbb706bf07b8e886895e438caa9df0. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/IT7J31900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2c936270d919ae222869eb9ef4d05c886b76280c9daaa004b1fc6c21be756f. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/IT7J31900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e9a9c4cd1d928e447110416d075d85bab45956eb8befc79dc2f5a652475ec5. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/IT7J31900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e24f9b7fa118c869cc5e09574ce1fc02597fdb0d3a55388a2874a192501ca47. 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/IT7J32000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db5c2fc698558ffad274e7b158ee7b1285789d113ea66136c29e19e7be8a372. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/IT7J32000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10074fd01720600062557facd38cc704ecaf2e41fc218ef10164cfe1c9cd2a07. 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/IT7J32200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63ed752f78a55a20e3080a1101e1da25008530889e73c875da7a5fc29505d66. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/IT7J32200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe716d7fac280c717533bbbfb0122f6aabac0e2cd5e17fe07526fba55c35fc561. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/IT7J32200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974af64a94c85fc783ef7515cb7d020a48a873c0ada38f748aed745dcc7c80b5. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/IT7J32200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa09850ccc984cedf4e810b88b91abb329e5e54f0b6ceea010977033674caec. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/IT7J32400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf40d95d74fe751defd9e0af3d5384ed056a0bf9d24f41640318dcae0aa92d94. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/IT7J32400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef93661346c3136665d6991ed3be6278de911dc180da1eff84a295c586ef4267. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/IT7J32400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8fb86ac0cb552f89084e7797f8f800817555bb03150356e0bcae67db4b9ded. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/IT7J32400033.