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 0xf9bbc3c97387adf4f9bf881539168a041dcd7cd3ac3f65114d46902171423759. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/36031758-bb04-4c6e-913d-969038831d00.json and https://artists.proofprofile.net/proofs/artist/36031758-bb04-4c6e-913d-969038831d00.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 0xa107be640f31b118682836cf35bc127bd7c6e10a2da132ea552e26029f3de635. 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/DEDW91800870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9c45f14e273ff2f329fd1b0ecc4fc9f0791813649194021ba6ea36e361f2a4. 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/DEDW91800872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65052ffbcf42363372a883b3e8542acb0c50c957efe8b293bbccaab14a5a3259. 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/DEDW91800873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd52d6e81f3b883ff6bd718eca33524e8e581184fed646424eaa2705a09afa7b. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DEDW91800874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902de5f5161773688bacac02b4398e34b34448bfef1ccec896f6c3d4f6582783. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEDW91800875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b945d1b0fef172089a3fcca8ce0ec9c561d46177328c81799cb0ccd1180778. 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/DEDW91800878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa80fd5a4f50ae2f4baa7e43a80d5d0385c03aa936d1d036c1a8ceb412676170. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEDW91800879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f011c657680bcb3bcebeb7ebf61a566815aed9283721614e0cfeb6a5c30513. 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/DEDW91800881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4befe18f2da44fd987fa7684644284c5e4c0ddd0d9947a01068487f97e439e78. 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/DEDW92201061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d85675f8a2098b7704c7fbb9402c2b10ade38f542187c49f4a0626c2df661f. 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/DEDW92101030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bce13288f92ae3ee4d164497003077bdad44a7f6ac01d61e318a80068d4af51. 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/DEDW91100148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe858f25343f5d7e6b2f6727eaa10832b287028b28f9dcb357ae590a831f2b9b5. 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/DEDW91100150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7dc1966acdee69983e902d6ef573d305a66cb9be8766a2f2c6fbcc19af5fd22. 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/DEDW91100151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4befe18f2da44fd987fa7684644284c5e4c0ddd0d9947a01068487f97e439e78. 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/DEDW92201061.