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 0xc7dae509c58e620a62c9a6539be335f64838526703d5a21ba61221c17e1b8cc0. 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/2a546a5f-ba86-4cff-bc6f-f5244eeccd1f.json and https://artists.proofprofile.net/proofs/artist/2a546a5f-ba86-4cff-bc6f-f5244eeccd1f.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 0x43253511574cdd6f99e1559cd2ff4ecfbdb95635d3016c2dab3082fd033807c9. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/PLC062258919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2e94c3abdfded903190b555ffc62f921660dd9eb9b6e66c1dae10d0ad8d0c4. 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/PLC062400550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eed1c3af032350ce60dadf27c0438e7f975692aa35fd0a4a782943e75122ba8. 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/PLC062431060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09da6689a4e7217c8ed373c0a452c897eb59c4618be1b259d5434fa077a1ed33. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/PLC062434843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927cedcdeaed43600c41cc8f1a0cade843b8ba71e30eb8eeac073b91512778b2. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/PLC062438023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc3d0718442d5b8a090e029427f8a9ce25153716d0720f43473fc7d3d55788b. 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/PLC062439488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06617b6593542679dbfea5abe62169d9ddbe3e2e8fe71035eab15121ba7165a2. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/PLC062443584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06617b6593542679dbfea5abe62169d9ddbe3e2e8fe71035eab15121ba7165a2. 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/PLC062443584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f80f6d7b008e56f6525874c80a8ef8a8716d4556f7c06eae031a0d6234ba2fb. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/PLC062513424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb9fa8996cbe071ba14ab5e72b38a7c0de710ff30b2c5449e5cbc09ca102007. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/PLC062513417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23281a7d48c7b033a3c24d93607dc109d59b62adc3b5e70aa3a5caa885c8659. 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/PLC062513420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc3d0718442d5b8a090e029427f8a9ce25153716d0720f43473fc7d3d55788b. 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/PLC062439488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa363362cfa20b1361a69e2625b43de60943684ec4c3ce94671ea9ee61e5ce60. 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/PLC062503192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd925d8758106ff8102c34283dff74ad85bd0c1af3a414dad1f78121005ba7e0d. 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/PLC062513423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03a08a7f20a88e3b44fed034273ff51383ea5da688720e4317d6503caa1a9f1. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/PLC062513425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912c87846a61c2ff3e2cc76ed4b25bfb3c8b1eeb1354dbf76161a0bb6243558c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLC062418759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272860414da3e60f2607f0b33a09aee72ed7f78c5dbfb5ec0ac345dd3a65e7bf. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLI363521980.