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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87226647971f85a35596ac717340e5d7e4980e72a13faf7a74673fc49d0769aa. 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/d722d801-f2bb-4840-8691-d0f049ce54aa.json and https://artists.proofprofile.net/proofs/artist/d722d801-f2bb-4840-8691-d0f049ce54aa.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6217c2eefc5e76afff5ecf60e01a0ad37148b6ad7b1ce11845175b70938bf5a. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:25:30Z), 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/US25T9919991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8f067b65b83028713bc5096f365dcc0975d3c4ba28d9ebb5af0187a7cd28d3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USQK60910012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9709fedf90a713b7c9cec4435ad3d92abba4cc8c643b0995d9e0ab0c8e5c10. 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/USQK60910016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6937704e680af9c129348e13a900f4c3052685f5a08e335dc83256e76c0a623. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T04:28:52Z), 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/USQK60910018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150c3acf5a673167545e40be9ab640db523afb8ebb2a9daad10678bed9832e2e. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/US25T9919999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28243cdf39e8dae2cda822e7a3ef5d8615b64ccce545d4bba5ddafe2107d870. 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/USQK60810041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f15e46b45d298b462f02282354207db3ac63a4efef2499f16003bbbd814cc3. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USHM80564565.
QHCSF (The Quintet of the Hot Club of San Francisco)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaea5435ea8f5132ec93ac94626c2fd86b031ad83922f9f0484a692f2408140d. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/US25T9919985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04f920090b744bdfc06b923d164ba9449263e2cfa2ce0e7a2d486f46a6a6367. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:00:40Z), 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/US25T9919987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6217c2eefc5e76afff5ecf60e01a0ad37148b6ad7b1ce11845175b70938bf5a. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/US25T9919991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4fa7aa97b721a98afdd13c3db9f619428dbc61b10ee9ef14907555ef23fcbe. 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/US25T9919993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6c28702ce4fea7b2872038c7d09ca347a579402a137a68e73b67f8604a30f9. 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/US25T9919994.
Hot Club Of San Francisco: Bohemian Maestro - Django Reinhardt and the Impressionists
Hot Club of San Francisco: Hot Club Cool Yule
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703f103173c19d48da39a1108abcefc37af2a91e2eda6a6fb256387817db599e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USFKZ0710004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d132f17d13a11ca542c72b640899859b6d4732400785fe19e38ee4a5ced904. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:42:55Z), 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/USFKZ0710017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ffe2a752dbbea9b88648e7518fecbaae60f1976f5c25e8164e8b548345f613. 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/QZ53T1600001.