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 0x3f6dc7147aa41349b64b3b50554d6ba61b144efb1b60cb373a3d73de250517eb. 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/846bff6d-601b-4fd6-b01c-2cc1c906f5ee.json and https://artists.proofprofile.net/proofs/artist/846bff6d-601b-4fd6-b01c-2cc1c906f5ee.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 0x95e06d4eaa262b741588de727577275147bdffb1298cb49bef574747d3f37bed. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/AUMEV2472403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6aa0b243431e9026123b463d3a053c3f084d4d80152404981f8d718dc169ab2. 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/AUGBT2302571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7e570ddcfc6bd099d1f06270fbf3d805ea2c730ac86e6f72a8b17ad605a533. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/AUMEV2332180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ca18f751c23c680f6d1e6913c4cf25bb0e2fdae00417e770f8ec558221d6dd. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/AUMEV2332185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764947b7260090e1a47f105fd701ffd5f8e5e1bb2e23a9aaca6526146635c65c. 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/AUMEV2332177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98f6bb4dade05435dba4a611a59f6b3e552d757dbeb21cbbc828f3a4f398dcc. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/AUMEV2307351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a4a8997e74e01fdd3c5ea6de3fc8ee56d8befac7697eab5abdaf374c26ee35. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/AUMEV2272606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc213114ef3d32c3f060383571d8d19ab2e08cb00686856290cbd129bc10323. 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/TCAFQ2138286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x257518686ed9d3b19426793caaa6bf081fa1e49f9f08e6c5dbad06fe1a143b4a. 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/TCAFQ2130083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc9e2ea4bef0e0b51481ca3ef9f751d792f5b42cc61a455ba43a759b6351e30. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TCAFJ2129637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62bd3ec3b3da894f979cde4b9f3fef91b873e6c3d33d2decfb9f7158bee1d935. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAEP2099798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff41cb4175df720e0bf448358c9ab2959dc145a1c08ab85e26d9f377b84b26f3. 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/TCAEP2099768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e17ebf34458b8076f0842bbfce77579b45f8152b198929c93077558707b065b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAEI1919088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8db8fbb021f8ddd2de814c417fb6810d4046512d4c69a31bf52198809ed022. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/TCAEG1917444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f524523d52b9fe115957bbfeafc242b190a199896274c46d16758fee18a350. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/TCADP1832226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060b2e2a8bd1084d89764e7efb133363d7267c1760da6c215bc0a7d595bf6f81. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCADJ1738621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7cca8e25edf39506049452075ada831a79f4f1ac657c9adc7d310aa2494c54. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCADJ1738623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcecca1a9b3ca1d5853865a86cb35c6d90869b7e99c0c3b9c232ea9ddff7b271d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCADJ1738669.