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 0xdcff7f838fccd07fd41faac0a722bda8b2fe0f62904091921ad3d59ad0333cac. 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/5b6b9e6d-8a25-4ad0-b114-4e021d68979b.json and https://artists.proofprofile.net/proofs/artist/5b6b9e6d-8a25-4ad0-b114-4e021d68979b.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 0xd4483eea1a8f35b54f6d2b657accd9de0ebe64f47b0b69a1be3e4140719645cc. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/QZES51900272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60bee4f9ac5100763e7bc810966accd0c4ce804f64b19e2226383c54389e577. 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/QZFZ42016649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877fff053aced0e184ca681f739d3c3eedef247a2fb536c3cffb4c0d08c2cf3d. 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/QZES51944584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14eb2d9139629359d445e6caadfe01531f5986bb653a390d9d43f8b3e38023a. 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/TCADT1893997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e108e9903ac5b1d94a3a1f37f62e072bfcd449d2007e155a6caa296c115d80f. 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/QZPLR2453349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41568097156a7d715039c9b3bc92aa83519eb68e73ce152c97dc45d47469a983. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZES91815501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9a935c2df6ffb1ce30e3bb0e346cf6f38e7b348e60cad1d8ebe118eca38810. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZES91815502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48e016d9c1cafb076369159ecdbe5d79ac6bcf1c95588fdd255a6f2fcbf24c0. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZES61811139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4131f06e2320954ba76a9e0ccf847351d92e27def989931316d2ad0dbe410f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCADO1894958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc729da562549fc03839c457c91848528c6dcae1774c291528511efe5c7ca72c6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZES91815503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9628fa5fa168085253180d9619ae9c3b165b343e528caef647e1bf0bb6eed2fc. 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/QZES91815504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c53ae2b91b4d3c93ddd5e974c4e02d482f6ae9851863a2d00439d6be1bd002. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZES91815505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0344c0e46c486b829522f5354d2133f32ea6fb2ae1add4a522071b9560547c26. 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/QZTB82327990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752f7928e293400034ea9c6e09d6e06c682ed47413f69a919ddaf91833c500fd. 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/QZTB82327991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1be7422a38e3917bc8bdab3d34ff6e97a1d200f9d87dd89d9e0eac2dd0da6e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB82327992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dea13fd6ac9b89b9ec769e4bc4a758c4a087abf2d209868a7eb11ef7888401. 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/QZPLS2155252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3becc2de818f3c0c853b491b1d70f93c1c0b3478513eaed3fd562f22795bf052. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZES82054197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09895fdc05dc8cbdf5475750491d5ca1eaad4a88bbd37a09ada0e4daf71aae0. 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/QZK6N1933484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8e455f60647089ac556497dc4cb4e086b46ac1afef83fd6da0fb2e8583f4d4. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZK6Q1907895.