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 0xd1e704ea92a6ab821a3342831b05c35bfae0dc5d365278513e9d2780ba6f98fe. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71da89ca-f35a-418a-aad4-566badb1637f.json and https://artists.proofprofile.net/proofs/artist/71da89ca-f35a-418a-aad4-566badb1637f.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 0xfe26d13570938a2b444638d792b94953d03666ec78467e213cbb596603a36e2f. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QZNWQ2374019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ddc7071f7d25fddb61a3e769d15bd73a19c2172cbb9e283eab46bf4c80823b3. 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/QZTBA2424696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846c35e88b5815652f839bb76897d1736f83eabc18fd4d39dd2d73c6d2b697f1. 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/QZWFH2473382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846c35e88b5815652f839bb76897d1736f83eabc18fd4d39dd2d73c6d2b697f1. 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/QZWFH2473382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8512144d6dca7e2c036222690c590f7798a7515e990d317417f8add8580706f0. 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/QZWFH2473383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838a3968f604da734bac8529b625a4e85d4911ee318540fee9d28cda949cc401. 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/QZWFH2473384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9f9d2d6cd62095e89ab261c259d0a8cbf7b0ed54c0db9b4bd54ba1c187b84e. 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/QZTB32423712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f2233882998520102417f2854b953dbe05edc62f48ff07d9312b2f90e9d852. 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/QZWFH2473385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ddc7071f7d25fddb61a3e769d15bd73a19c2172cbb9e283eab46bf4c80823b3. 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/QZTBA2424696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581c18f71f7f639774f42fe8e689c0c1fb9f28590ac427ea42b015de0a3a95c5. 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/QZWFG2448131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdaf11b925f38ae0e35d2dff63ca2c0b3263fb36ae7c6b2d4eb12d82e626472b. 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/QZWFH2473386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678d15e21689180ffde5a77c23b0ba1eb8cb6ec59a8ad733af97088164388c7f. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZWFH2473387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98ac88a0e3c24aacf976e0c94384376cffaa22bcf55cfdbc5ac2b5c957041ba. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTBE2585678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087243ebd7a6ae00222581995dbe79ebe99aecb54e9a20ea26e47d0d1cf0c213. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZTBE2585681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0399da9549736e3f84036a56c32be4a0fce49b88a705c53ae6b99ab850ffdd. 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/QZK6G2339270.