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 0xb0cf96375f9b00ee6540a243c156336f13770445b9ad65a47e3f113ac417401e. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/59a67898-4383-427c-ae9e-7de0d5d9c1a8.json and https://artists.proofprofile.net/proofs/artist/59a67898-4383-427c-ae9e-7de0d5d9c1a8.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 0x24c407a836dc58a2bbd4b76171b7c56dfa893cbb859e20f465cbae347c7ac6a8. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZNWW2026193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4f6016d32a5727dbd396fcbdb12c17a1abce32379b886cd37f7d06b622c8b9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZFZ42294383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x111bdf6321147cb87b0d1f5e2edae6ea515a0b54f163fe1b40d6399ea5d120ed. 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/QZFZ42294384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f119af871b4dd3ab24cd969b64603ed7bf7b95b18f6764a2c9c6b67e59365cb. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZFZ42294385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50242a536fe8eeb6550cbd977271c3be8937c20c3f72473c105a87e00818e6f9. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZFZ42294386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b12b50b6777d52a78a2d38ce78ec093352d5f05e7c0c518510e74a156f94779. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZFZ42294387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4f6016d32a5727dbd396fcbdb12c17a1abce32379b886cd37f7d06b622c8b9. 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/QZFZ42294383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x111bdf6321147cb87b0d1f5e2edae6ea515a0b54f163fe1b40d6399ea5d120ed. 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/QZFZ42294384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f119af871b4dd3ab24cd969b64603ed7bf7b95b18f6764a2c9c6b67e59365cb. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZFZ42294385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50242a536fe8eeb6550cbd977271c3be8937c20c3f72473c105a87e00818e6f9. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZFZ42294386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b12b50b6777d52a78a2d38ce78ec093352d5f05e7c0c518510e74a156f94779. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZFZ42294387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ca09deb12c6320e88c50d689c33859ba5e8726052c8d8101d3bbdf47251ca0. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZHN82209776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb538506cd671a715b6d3e2f290fa6797eece2eba41cc9480e5f17ce7ab572bb6. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZHN32307157.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203b83af4f6c28cc6a2b72a612b144714d913738ac09da6db10461a080479fb8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZHN32307158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd9accb13805773d94d2e4089e09454e1b973498f5ef30c8311bbcb9b1a1549. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZPLR2318369.