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 0x5d84cf068bd0cb7d43ea6ec1ba1e58f1544c1623d8a78f8a0f5a2aad4a2053d4. 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/1aa1a02e-c81e-47c7-b629-b75269560d79.json and https://artists.proofprofile.net/proofs/artist/1aa1a02e-c81e-47c7-b629-b75269560d79.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 0x5a9c5365b951ad4aa39616baa995dc8820775fdb6129e0791b3378d61d3611a5. 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/AUQT22100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394bab4bf00733a9ecd8d6bea43002ebae8ac35411773119ae6c046d7fd4f714. 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/AUQT22100050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6908484d9fcd622f51aed0d9c78873ea790b4ae8c32737505b1f87c5964ab37. 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/AUQT22200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05f1978e85b491e7fb2beb7602eb0e5a81b90352f846e0f1d000001d5e4a98b. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/AUQT22200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e95bff80125efd58d4c8b4d370d2be9d92d2632a62c4f0b91010f32f8f8f4c6. 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/AUQT22200058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7211382630cf6ecb7a73cf67d9e7448310c065d76e18b5febe7a96a20384b3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/AUQT22200060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ae2e96f6f198887dc2941075c62f424d493133ff6aa4f793acb1fb78fbb60d. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZFZ62469245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccaef793bbb2f7bfa88a768068c8b4d6f27d799518fce58647032fa747625b31. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZFZ62469248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf05f1bb057ef1170b93d8e5e4990889fd1fa5731de9fb927c7f5b437b63170a. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZFZ62469249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91dc67d89da517d7eca88545216f323116d4fca921dfdc35c271261eb829fe7. 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/QZFZ62469250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97070037bb1f1a091a87991797ba0d0fc81ce0021e6e27f62ada4dde0912548e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/UKPNT2500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6e20892ecfbcd3e292ba306b5e599704f91c2a433d7d39db8eae2f4f95c905. 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/UKPNT2500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bfba2109930ed02c033d853ffa031777539cd76505c42c02b9d4c9ad031f60. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/UKPNT2500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bfba2109930ed02c033d853ffa031777539cd76505c42c02b9d4c9ad031f60. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/UKPNT2500018.