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 0x227f24dffdbe92b692cf92b2c6f0a6bb6ebcfe55420357ed312c1ca8a9d74cc9. 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/4d7e9191-c638-4684-92fc-a9050fac6319.json and https://artists.proofprofile.net/proofs/artist/4d7e9191-c638-4684-92fc-a9050fac6319.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 0x8b5a5bda89e76fa639e98ef2508b7fb4dcd7f4cda389abc987f2a770e69db6a8. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZHN92105802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bac5ba1bcb02756293df7886e617295a0e98e5b0d323eaddb584896802c0c34. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZHN32126705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5a5bda89e76fa639e98ef2508b7fb4dcd7f4cda389abc987f2a770e69db6a8. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZHN92105802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1b3b2785405021278e91e29543ff77085dcb932d1f15aff8670990b33e133c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6P2103482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25a409f2e2901bbca6b4cec62d048f5e5ffc2b63f232532f9a8874ac1215bff. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWQ2227107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e82c7305f38112a07fbcb1a1521a88979d8b547fe7b8466b7547538ab9fedf9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWV2258337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200d71cd682eebd5b8394c2970f325ebf6dbed2aebe64309084ef55a38cc1e3d. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:32:05Z), 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/QZNWZ2218707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e944a53e0b3413c0bece72ef19f8683b005c9d9fceef9240875c6be4cfbe4b. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6K2493105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b8484c31c5c111d514fa221f6c877fa1c4b22cf48bedbd197eb7541b2462e4. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZK6K2493106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c0c0a8561c2f8c7cfabfab0e25a7e87e31313381c16d646a74b640fe0892cf. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZK6K2493107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97990946c68b8467a0f56bd47c36b93303b10364b4ad12bbfe99062733075d92. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZTB82461423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97990946c68b8467a0f56bd47c36b93303b10364b4ad12bbfe99062733075d92. Chain 2 (Bitcoin): anchored in block 957730 (2026-07-12T16:41:26Z), 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/QZTB82461423.