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 0x1381e64a993f7a1c18e2d588440b9d78f7c4ec3c7235b0913107a1677804e606. 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/d88661c9-415c-4600-9a6f-af1eca653053.json and https://artists.proofprofile.net/proofs/artist/d88661c9-415c-4600-9a6f-af1eca653053.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 0xe23ce3a0f837114cf9d4b492670d354b9c7f61f496f74f52a21639e00d56e711. 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/QZTAY2473718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81050e93c873ceeefd5fad4c02884095b5f8b7e1823b02e5d41983a9e5d2b85d. 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/QT3EY2459129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff474349c13ce90bdb3e50188aa8903bc58a8416a19a2013cd990da5ae5c046. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QT3EY2459130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e7333bf43e1492753406f4ed1d40d204c5607e388aa4541277c6ba013024db. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZDA52532582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c461ce9adf5b7d8c1fd4ad5df1fd5c31fd57240e6de458ac99dd6e3c77497a2. 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/QZHN42531360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528eb0a00e6aa06d663b1d8b93ba76ab73005e2cb76600727d3f783683c9a1a1. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZHN92517397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356fc72dc68121ffc656690d66ef41c58169837cee99280fe729d9ece33dffdc. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QZHN82579096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c17f7a589d4b93d50f9f5cb5cd610ac11beb2ca8b8d9290c5e9873a0229a8ed. 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/QZMEN2590935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122ba03435e4a35a797b3fe3e853234d36b6d8012496bb6ecb6b1e86ac6e51c6. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMEN2590936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b51b15962d4cf53be9db71b922edc331bd82245b8f7df0c870d2f580b2f481. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWQ2563865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a25f2eb8e56530f50c5b2754bc0ef27a0fe00cd941d62e3e3a617649f122cd. Chain 2 (Bitcoin): anchored in block 958861 (2026-07-20T10:02:52Z), 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/QZWFP2473616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96ecc57e9b8694dbe454dd462f6ef1514f7572d1a5cca0d0a87b0a1ae3c584f. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZMEQ2598424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4131ed3a03f74d0a0eb5ba7293a67b5cce69f6a8a2d3536be66eb5d10e5e4a9b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB32514153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038eef321165c6ff2b4644b97517b75315b355d37427b307ebf3ff802f60d075. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTB32514154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e9c08c1a7964a7d5b3e655b6a658a2ef3b83df80f881220d5aa49767e11f30. 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/QZTBB2544238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25aa3181a9e5eadb4ab0d2cd7dee8185e8dc8cf0a0e65dbc62767d821b3fd079. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWFG2599729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3744a3b903cd980d55872d4cac5695e3b633ef4bb85578564b88a1c2a47ba9. 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/QZWFF2548086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4ad80b5e34d4b968c1c216bf7e27af7d4b56fc7034215e82cfb583f629f37f. 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/QZWFT2509934.