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 0x3604b9c6f106ede9502df2638636c5ea7dc4c16e6467f186cda67f5961e20174. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7711942-6914-4877-a901-73ad693351f8.json and https://artists.proofprofile.net/proofs/artist/d7711942-6914-4877-a901-73ad693351f8.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 0x050348bcfbdfbcb6e5bcb39147fa8e810e486579eeb9e64f5e0fa0ac33f232be. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USHM91987773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738aba969b2569d454e3d597159a88a9c30d6a45e8d99d881176e263b3a851af. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USHM91987774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f275d71456f47f5f2e87160296c5b669c2aab4c283fcd51264eabfecc16a8a. 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/USHM91987775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd5ce7557629868d4c2e0e42c65efac1e094df4586c37da33b2b2629678faae. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USHM91987776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318b8f20ec1d1cb99523dc5b47ec5c289ca9910ab3040a4459041617464245e9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM91987777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3585d3365905730a5a1cda32b9e976795116e7f36056ae738c2b08ac9479dc51. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USHM91987778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08af5cf364771503ca2b4d91c3699384902aaecc0f45938a1119c43684b50b58. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/USHM91987779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04ec2cd3da573e7cd4d86bb69abf38f9afea49a5bc756c1745a705027291fbd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USHM91987780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6875a81ef99951a2b1dd175f8aca042db2ac80fed731ae04397eb09849fc7b97. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM91987781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6cb90cd8911283d3d3075b15bec69a3517f1b4153524626d5288ddcd685aedc. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USHM91987782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3949e2957bf75aa7a42c8467b40dec057db4e1b4dca6c696d3176178be1d6e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM91980361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7560175def3358b62004627ebb0c0e168999dd6d6d292dbdebee3a4ac33eae. 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/USHM91980362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcae387495e74e1405c30e523378de8f1c656c088cd570ce6cdca137366186e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USHM91980363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x513a5c14cddb5123f1931505954796f0b1636b86455d322fde249777201091e5. 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/USHM91980364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610904bba2d271ae83597de730302e185194b985111e81c238aa3ac347f8b887. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USHM91980365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf02b28bfda4d571e51519538b13e44c46c099594df2d1dd818ecd495f6c7c7a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM91980366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21183c80c6df0a5bda07999e5f4fea52905891f534c16e82f9b05ac59e290ac. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM91980367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2db86b3f3fe3b3e5c6aaed04cad3b33b3f9a6ac23d3a286c89514e476f45f0. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/USHM91980368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61befab67b337afb798d3a91834a85c354013c346d93153255b5375694ddc742. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM91980369.