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 0xc468b01f92c486a32202e435878205c4458029127e039b436e24cadd1b303599. 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/851c900b-e47e-482a-a574-128f4f05c2aa.json and https://artists.proofprofile.net/proofs/artist/851c900b-e47e-482a-a574-128f4f05c2aa.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 0x53e46f911862e1bc18141def396164e19d38a5ff845203c7e2d2d8571d1e8b5a. 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/USLZJ2453260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2c2777b684ff0192e8493e86ad6027c1e735b4e3f37d101f8508de78b8a9e9. 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/BRRGE2400274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5d6b21515b03a2210c175ea5cd8f25a20db318c285550dcc883e9874f17d10. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDD2488618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013e75eaf68c1a0e9ff94d9a3c6ea02c2988fb6c16155638bfeb73a122a01cf8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZWDD2488629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91535568fa9d9b74456532284ab54696f3d3e0c2792475c7cb7de19345b405f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDD2488656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ced1a0b0564591e00906c605951431f7251740dc381ad3b3d00b779dcda6ce. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDD2488670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f62e774ef22a715a04137a02fefb5ea5174150efe26e0bf0b1c9d96bbe9aa58. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDD2488709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6beb6da89263d5b4d518835822622cb924f73c9302060d47e27457ccb0874fa7. 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/QZWDD2488713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607e7e805ae984e3491d2a9f9a23e2f2224e1387981b01e342803001e0cf4de9. 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/GBWUL2497172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a9b0eb9b6d11039342455c0fd86ac012aeedae27dbb747a4429f3b8cf30028. 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/QZWDD2489928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83fd70e442dfe379fb8532703a0e3935352e7abbabc2a5392ca3393831cde92. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDD2488755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677add1c6dec26f2b9ea59992a2902ec0f0a284dd5cf454d94e8a14b9a4ea8f5. 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/QZWDD2488768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb363ecd3f12bbc38e515de89305ff6a15adad3e86b955e25ea688a1a3600b933. 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/QZWDD2488782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73852f4a72ab66e31fecbea4e58072b39c01ade314c5138f257c5f9c63dd1c07. 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/BXIV82469105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca20359c53489ba254fb9e521244a6e54b61df5c742802f1bfcbd64dae25387. 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/BRUM72301354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677add1c6dec26f2b9ea59992a2902ec0f0a284dd5cf454d94e8a14b9a4ea8f5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZWDD2488768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca20359c53489ba254fb9e521244a6e54b61df5c742802f1bfcbd64dae25387. 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/BRUM72301354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e46f911862e1bc18141def396164e19d38a5ff845203c7e2d2d8571d1e8b5a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USLZJ2453260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a9b0eb9b6d11039342455c0fd86ac012aeedae27dbb747a4429f3b8cf30028. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZWDD2489928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5d6b21515b03a2210c175ea5cd8f25a20db318c285550dcc883e9874f17d10. 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/QZWDD2488618.