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 0x780c68683c0f46af4be9f90db6c8824bc165902c62640ca86d38bac85aac3d74. 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/c1b43b52-c795-4baa-9cc7-2d26bcb135ce.json and https://artists.proofprofile.net/proofs/artist/c1b43b52-c795-4baa-9cc7-2d26bcb135ce.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 0xba46d9abf89cc625d2a7ac9093ce3096e7621d7a34ea53b03f2c1cd76111a29d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USX9P1203388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35965c225638a9fd62e3eec1e5cd5b63344c4b2869903b048d7b25a51bace44. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/USHM81602648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b803434b3c5d3c5a7b04c1d8b293f0d457a56665cc7734c136d77360ebc8a20. 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/USHM81602651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae56a924ae32f6b2a6876a4d6c9e5ef792b49a0398f45ea290eafc84d886e09a. 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/USHM81602654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039fc80d83bf03dcf19e3443a849fa4c81b28ec37cbf335ed9cafcc8694035f4. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USHM81602655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10690c2af35d1bf06de5ebf5cad4e67e2c0f76370d2e0164141721fa51ae2cc. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USHM81602656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9640bb1131cb949e62d4809adf78226d4f87e00d6474fe7ca1aacbb25bfd7b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USHM81602658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec89d485db24616e17ad28842f809030a0e92c31eba93a06884f2128592bf3a7. 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/USHM81602659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc03004ad5c6a00186073de972741d74c3e1ec1a307b5f1937178796033a7fe. 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/USFVZ2491314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff6250d188cb8cd3bee7c94dc9e91a6b4370954bd642148a996059c9cf227e5. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USFVZ2491315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7dcf68ae8278d7495c8247cd9e5808f117ea6f8d5858f316e6f799128b9c8e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USFVZ2491316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6e512e99e0d0342b152e035b4b37da4522006a652ce00c6c3f6a1530feabf4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USFVZ2491317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384581404492dfeaa64cf4705f85fb0b515786fc26418608bc0babb2e8f2b2f1. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/USFVZ2491318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e22a63d88ec6a960bbafaed080ba89352d025484719e0a9282bd32a2d65edbd. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USFVZ2491319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26edb769c22c47e45cb8701b491b4aa095e9776462c8bac9a7f2b019d6aded5. 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/USFVZ2491320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d478a37b3a88fa2812134db7614ab5dc915fc5dadeca03084fdc97f8df3db31. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USFVZ2491321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd119efb852e5ca9b0d8ea903de03a1fd84b0b3592ebca7baf625f6c1ee944444. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USFVZ2491322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74460d3e30be8d04503f35a047388ecaec35795f1eac87b9981b7310a99a872. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USFVZ2491323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ddb2cb491a09014f1294d11c9e2263127a6a5f241061d9c1a1571771bd74ef. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USFVZ2491325.