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 0xde6db1301d547ad60dc27c58edc1ad96cf7bd24750a689292e2f71dd0e891fd3. 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/d690f75f-ab91-4f79-944a-1bef38fba297.json and https://artists.proofprofile.net/proofs/artist/d690f75f-ab91-4f79-944a-1bef38fba297.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 0x86def48f56ff89f766842b01d035286a4305831b7d0f3ca6208a162d442b93ce. 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/USEW20000088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e676842f4f585a493e24959bdac5eebe272ae1544a0170ab8350bf3fb881c38. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USEW20000090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e23cac99b5b9b648832a47f247a75e7ab06cc123e07b54957841455b11b0dce. 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/USEW20000091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec7c877b76827f425dd13a0c61f602a2ba3ac72b3c955e796e8c595961b0cb8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USEW20000093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79fcc399532d7b72c13fb8bbc2238517d4e9496f8301e8a253017daec9c4a9b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USEW20000094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c868df386fcec0f14a46cf95cd38a077acaf23c8d7340e3c225c8418cf1706. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/DEC268510096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfd6b57f80e84d9979a28a8353cd5d4885b22632587f5ac8a22db8d93937fc2. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/DEC268510095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95d5e9cece11119c0d125272be825f1911d6339e4b6e68ec6d6495db1793569. 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/USA371058239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d1c90a305388aeb54809448d67509c18f87fdde70b81c1e50a744541973d0b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USA371573047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d1c90a305388aeb54809448d67509c18f87fdde70b81c1e50a744541973d0b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USA371573047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe723c240fdc27edecb4b1b46dff5c14ef67d1c83a9bc5f8f7a3ea7dccdec91d8. 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/USA371359267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c3d014e71a4b452d2141571f764289413b411032e364c6bb3a64d83d5d7f84. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/USA371235638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d99dfdc5af0751f7e7b400841e31817c2f856f90f45d5fa712e3d9282d5121. 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/USA561418629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d133f96a44645eca376ea112283c2593a9e3fc654985608e6ce22671dabea09. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USA371122407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1046d2698a162e9d595af1afbb9d25595f2147610d6729ab6aa52561a50c0f89. 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/USEW20000089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1046d2698a162e9d595af1afbb9d25595f2147610d6729ab6aa52561a50c0f89. 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/USEW20000089.