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 0x7e8dd40296c4d70d906c8b3ecceb280c45ca857adb15e71743e1cd7b973df0e4. 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/27e7b972-620c-413f-902a-36c0ad6d8922.json and https://artists.proofprofile.net/proofs/artist/27e7b972-620c-413f-902a-36c0ad6d8922.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 0x946bcaf1bf2b4e28b0d4817292bf35f8c989c931e509db86979b77e9fd82e6d3. 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/US3DF2469680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1546393430ac33c16078d88f1963af57e936ff85c3e43b2768430a6112aa573d. 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/BKSAI2400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de7fae2a4ff7d8cacb834b18767c60cfd96b02600b49ff3503a67b942e40787. 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/QZGLM2457459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9316eb0665217d7a6076c7ead23145addb338e9a5bcb9f98f14889be5b1757. 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/BKSAI2400068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa65bece544ca9acadae753ce69dd8ccd812ac41c59ec085a300f65f4c861e3. 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/NL8RL2413124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca60ed01950a27aee28193612941006cb8ce30b3d6dc553618dc95197b0f1a5c. 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/BX9ZT2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d40d5f0c67d0167e2244861d6fd701e299c96fcaca3e80e5af64cd50758111. 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/BKSAI2400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76168a254a617017ad50cc90fa01adca2fe2fd46a7162d0df2b8f6fa807797d8. 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/BKSAI2400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068be005ddbdde3f1a731d336dfff4a23dada21cbc96b9dc6b88e748949735de. 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/BKSAI2400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721fe2aa7f4e3d3250d98fef80fa0952541e980726c17fff807feaf1dc3fabc2. 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/BKSAI2400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33ec9bb53d09322c5be4f51cd5b84e2dcad888c9fed453cf9f6c764f8288cc9. 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/BKSAI2400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c07ed999dcfdce3849531ebe0e89d38bdc6f4268199d074b4203e9aec460ea. 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/BKSAI2400046.