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 0xb9f0cf1940ea724e61f968df4e6073d1807b9fd25b9376f0b75cfc212e3f33de. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea91c931-0100-49e2-89fb-ece4fcdcad70.json and https://artists.proofprofile.net/proofs/artist/ea91c931-0100-49e2-89fb-ece4fcdcad70.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 0xfc8f39b27ad64630069bc69178c25d6b08b429bd13a93b47857098b7c06419ca. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZTB52257539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd956f0470b48dceeccea6f38125995962f58c1ac0f042d97a58718bc41ab74. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZES92358304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf761f328c134197b030022f03860797da0b23e3fdd5dd565a498cd1f8284df6. 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/QZMEN2351371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d90ed61e5a997a5c0ab85fc04ae2f43aa9f243cb7036313e1ad0b8b25e11856. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DERD52400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc786191239b22e303bd3e3242185d01d5c0be6272491e06841f28c0178b17836. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/DERD52400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05006170dba7bdacda5c00ed2c41b968d2e62b8a17e33ab1d20871cf5475eb96. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/UKGV82400163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05006170dba7bdacda5c00ed2c41b968d2e62b8a17e33ab1d20871cf5475eb96. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/UKGV82400163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e04203e3deafe8c9288c647803f35ef49f51bd677ee8606bb9a29e397d7318. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKGV82400165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89e52c1d3c8137997334a9ac189720bc7b0223ce010113762fddee9d932a6bf. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/UKGV82400166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb307d1e682d2020196a49b1a028cd44f16903553c8a3d1ba3bb8ae145b1f244a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/UKGV82400167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cbf75a36f285e0c61cd7d6b24b94554acab5c28ef08ac08616b31b7a8aa996. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKGV82400168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa672cf124d41a097c3ba9968d71e4deea89038c31512b6039ecc69a47ec1006d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKGV82400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252ba96bf8d59563d3bd0428e432563a533ee86cc908afe7c42986ecc5f1133c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/UKGV82400171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb93526bdd942460826af7d4bcacdda5e9fae7cd1851fd939ffc813dd68327fbe. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/UKGV82400172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3610e5b3094dccb984b68b322e03985bc6cd6954021c3fdd06d98491f877855d. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/UKGV82400173.