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 0x4501496f9700ba8c2d4448779c9a9f9c5f6c9fb7cd53701a6b38aae1b3b5ef6a. 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/a9404fb6-500c-4c7d-a69b-4ee722942470.json and https://artists.proofprofile.net/proofs/artist/a9404fb6-500c-4c7d-a69b-4ee722942470.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 0x1312d54941f107719ce3f45d6eb270bb8601b0a91ad33844eee05895e471956e. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZBHF2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d455b9aa210d15197d6ae12608cd91ecc3d5785f385a7b875eb1287076f0f99. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZBHF2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebb6d3c183f06fa13a4eeba68c56e81f41143c60e4e6dd0ec6bb283d76e5a66. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZBHF2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be4e2464eb14ac2cd168d6384647cc643774abb36bc149fd6ff74e7e88ad61d. 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/QZBHF2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfcd3a8bacb6a7eaf8d25c3e325f80bdfa46a1b1b1b99765e37de628463989c. 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/QZBHF2400006.
Fortnight / I'm in Love With You (Acoustic Mashup)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f93560c174be311349ab97b15c52c88318df1f559fd3a552530255db975597. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZBHF2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f38018855b938d02a5250089857a5d601a3883dc031773abbfa47f3bc408f3b. 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/QZBHF2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0eca6250a9fa6e653cb386a2806e158abde215cb906ad3d5164ce14aec9d9ea. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZBHF2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3817f9bfae0478e27559026e504dd3c6baa38a8d6b246309683265d44ceee1a7. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZBHF2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0eca6250a9fa6e653cb386a2806e158abde215cb906ad3d5164ce14aec9d9ea. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZBHF2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be4e2464eb14ac2cd168d6384647cc643774abb36bc149fd6ff74e7e88ad61d. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZBHF2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f38018855b938d02a5250089857a5d601a3883dc031773abbfa47f3bc408f3b. 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/QZBHF2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3817f9bfae0478e27559026e504dd3c6baa38a8d6b246309683265d44ceee1a7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZBHF2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb463f9968b28b6e994d9df5958ff9ab66f1473d7d76dc51cf795ca895813731. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZBHF1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffaee1f1ee8d268a05f02918a195ca8a88d4c19cf478c90ced7e5ef8c3a74ce. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZBHF2500010.