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 0x8cd2298cf68f5c7ac258b978ad718ebf0ef643c27c3cb67e0e6b13758798d36a. 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/cac2a9f4-9663-4e83-a0d4-f2482f3a2ab2.json and https://artists.proofprofile.net/proofs/artist/cac2a9f4-9663-4e83-a0d4-f2482f3a2ab2.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 0xaad8414e56aad87ced7cbc92533705ac45a15392a651a8232bd498385a59c50a. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBLPF0604956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4461ee8baa48a7b8e4f0586536e91a6f78b01834341e5bffc4269ffc097993f. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DEQ121754048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7b76bc0abeb166ad5ed8c8877f7ffa3844e10a9390ba8243f16ee9cfc67d20. 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/DEQ121744746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093e008e760955685af99a52198512a225d81cdf7698243d9069f48104bf330f. 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/DEQ121744747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3336b1411cb6a372e99668cb798b0e15cd6d4283b1ef74eb6a19d077d0c1110f. 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/DEQ121744748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191c1b30027abf32703fda3356bd7817cbe2275a67e9cf0ec8bfe4f14b7f6ed8. 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/DEQ121744749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2098b116d399f25014f0a039082cdcc841b0ace53f83446417668049529652be. 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/DEQ121744750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f6a08de6a24e345c6ce4d4a8d618e7d1391d6796b466bceed7fd54075a4a8a. 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/DEQ121744751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a61a12877e47e421b38fefbdb0949704eb969b4a7b409ba0df9a666387c34d. 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/DEQ121744752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81acabd6adb3e4e13164e0c825498717fdc559a8eb98201bf5299b4f9e69957f. 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/DEQ121744753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c6dea01324fa140ba2fac0dddb8e6e423306118ef0096d12898c67d710bc38. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEQ121744754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07b924610ef5c7b24152d8b1bb2e95ed7b4b7d5d9c6c9d806ad44d13866ab2f. 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/DEQ121744755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8925390577372e1d49b3b0ebc7f4802a54f0128bf63cedcaf5e54ad2f2fa7b0. 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/DEQ121744756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3634a9780522f4aa50cbd1f8ff21f2a06d2c5d66b680313d520c1c9e2f0a303b. 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/DEQ121744757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0007a654a6163cf4f34c0b98658b98e46938e640df0d4a1c21374fb3fdc7c4. 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/DEQ121744758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded6dae9da009dae5035755df855344ea0b472364c862fff060fb13b1f080d5e. 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/DEQ121744759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72db2ec282ee1d669059342ba4317a294121096e2a6ac907e7777f477142856a. 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/DEQ121744760.