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 0x34521e221b20ceb3ea28532ab502dbe46387d8c4ae18db16d489ba1d6bd54251. 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/c2645a29-4e53-4277-a784-82dbf5341e81.json and https://artists.proofprofile.net/proofs/artist/c2645a29-4e53-4277-a784-82dbf5341e81.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 0x0445e73b5d7155e0075de69393e2a01f3d47c4a0a7d0d250511fbbaa431e46ef. 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/QZAPG1724938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0ee14185c02c885b9aa1a066933dd8b8c3c87db44b7fe445a5de23b8b2dde5. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZFYX2082406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba235db32c0243f464d801c2bb9b3fcb894da77ecb2180b30ec66e42f95da04. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN42163013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4d64ffa7f8832fea4d9a995472e15489bec5d9afca1e4edc6011f549fa99b5. 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/QZAPG1763027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357d4e0d8c7c15c26146c8e3a860f5f1412a4a44f9a36bffedfad7906e725d99. 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/QZAPG1763028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8369e406e149f3f9cb68309a0513fc4e153df2d29140a18b50477abd699b1ac. 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/QZFZ22056415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a17608867cc11333177b4d4b7e5be42d35592987c43888a4687aab7ed02471. 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/QZFZ42053162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0830536a10041bdc91ac46c6e85992746b4404d97059bf52d1eb9e0be6cda6ef. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:06:52Z), 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/QZDA81873906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3feb39830e7b355ecc098844caf139a114c9a350fa5c756913bee4cf445cf31. 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/QZFZ31993726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a2126986056075c72afaa74fb9ad5357d097d96e373013a15a911a536daba4. 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/QZNWY2324589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89bc8563d3651a8ff6628ed818a756a0ce3d407c8df1b96ef604ac1fe0ecf963. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBKPL2091668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c32e7aa1d72f55ff3ade93f9507265262f215be2c6204280bf6997ea5b5a8cd. 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/GBKPL2091674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fbfdadf5be3dbf1091d37700422f5ecce953bed6adfb483ad61a05556b3036. 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/GBKPL2091667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8f35f4f4cd0b97c60065fa982c14fb6d02077f04f7f1ebec421697283829ac. 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/GBKPL2091670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027e8800dd5b9ec149ac27e591cf819c361d142541a5a11754befcdf966504c9. 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/GBKPL2091675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf38556728fe78e535ada85d82d85bcfbb829a7099b5681eb9aea51096d3e7b0. 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/GBKPL1971103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed5f0bd40b0880477d76ba9a7eca7b42a90b78600dab09e86a9b0633cd859f1. 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/GBKPL2091673.