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 0x775892f8f46b8d90156c0a574ff4271427d44c0eee832dfdfda87f97e0d95db0. 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/da3c0c15-6a59-4483-a8ef-033277d5446f.json and https://artists.proofprofile.net/proofs/artist/da3c0c15-6a59-4483-a8ef-033277d5446f.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 0x046a378252974db4c1da0b83944af246c40e5db3434ebdc0c5f420de668064f7. 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/QZGLM2239439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c3b79c99089bdeea4fed2d0a7cdb446ef3512af37ef5a5a7ae2bd36871501e. 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/SGW502370225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514eccb1857043f9747dd8061d218cd43d6770dc89e45c0e66c049ecfd9f847b. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/QZTVM2331829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2342a58f8c77db67d47a052a3d262e9399259ef3f835885cb08a940e1b1f05e3. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZWV32387451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55927c720d69aa3fd5a51b0f3a1ebd8a3b1ff983b4afbe4c742a7844bc3242a4. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZW9L2384034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867cb5c7771385501f62ab9d3fe009e40446d4f3b5ddb3ecb28c2ef89b094837. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ5FN2469635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaeb9491026a8cfb96c45c2e2834fc9bf40e13ba8267f5334fe1f3a08c5bb043. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/BKVMK2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75766064b4126c443327676a04f82c6d42f785e7b10bbd7c40c6160af6d75ba. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZZEC2457889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf155d48c5b5f941ca941a1f355b404e01b1b865a1f302019ab2dd7613c0b89ab. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T02:08:03Z), 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/QZZEC2431113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7048eff0ab82552bcb3eb78f1198d3590d0f4cc223a030fe8842c8d9461fda80. 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/QZWDD2585436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cef9e3ae14e0b5d1ea28a0c55da0e80824a5c4140a49d209faa758695c81c9. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T11:19:42Z), 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/QZTRX2556994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbf60446d6a37161f2f55853dc5f0431c6543284e77c72246348f15d7763bf3. 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/QZNJZ2456565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485519ad40c865022b690b628bf55328e972160dfea0c749983aa15a52a47ad6. 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/QZTV32492334.