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 0xdbc6efec6f565dd9d9d0cc23ff66a6a4ec52e2578a192c5c8b41feb4bab1ecd5. 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/6c757e57-f38f-4f2a-9451-353e0f5f1fea.json and https://artists.proofprofile.net/proofs/artist/6c757e57-f38f-4f2a-9451-353e0f5f1fea.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 0x80146a201930ec66935519be66592c1f7198fda3ff6f9d0cee5ff96c3bf2bccf. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/USDHM0603251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9ccc0f7bc4fc22b38a4cfd049ee2aca79da5a63f4cc738ba20b54908469fdc. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USDHM0603268.
A Cappella Hymns: Great is Thy Faithfulness
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc73919dcad97a990b9b7e6e4e9eae7c17dddbae47d5d9ff1a7c211860497c6. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USDHM0602835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d386878045750923fc00dae8f6d625047bdcca1a99d233691febb2104a1847. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USDHM0602838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68676179ff601dc1c3c843d90253a54d2c008f0edcac8111a176e0ee3e3164ff. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USDHM0602840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6838802fff2cbd3149ed57782538e75e0d26d372bc2dc6a4b024b183c373f1. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USDHM0602841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5fa0ebb7e407c2dd065bbf1e4a3c091f021d408d102f0257f2f95d62afd91e. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/USDHM0602843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02857712481a2dd61f8290622d0e49a7f9d739f137a65be10c320f340b4bbfa1. 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/USDHM0602844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52257373658ffa8e346df58e3582db1481755af398d8ff1b4cbe461dcd3778e0. 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/USDHM0602845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca26ab75eee34e77d557e6806fc499d098c2838abc8919a3f5595792c2d9d35. 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/USDHM0602846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5e54e6a92574b8a280cad44bf1afc90e197e4a8e528d5d07076d16a8155f76. 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/USDHM0602848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75b221e13c6479eaf3401b4710399de53572fb683fbc2dd1c2a5eb6ef4b4698. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/USDHM0602849.
A Cappella Hymns: Great Is Thy Faithfulness
Turn Your Eyes Upon Jesus - Favorite A Cappella Hymns
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaaf9f9f1b2d40998c118517d2390799a3c5a6baa001bcfc386a0076775eee45. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USLF50801025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3653be524b5d595da26a7863987a4d32e4b443d75e636789e8518618b5de9158. 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/USLF50801029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd780ed0e566952bb7e4cc4c2752cadfe68dde6731ef24fbb36cd9da67332e645. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USLF50801030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a483b38a569a9350b417a54ac65eb68f5ec2e7ca6b7f4e4f5e444aac157d93. 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/USLF50801035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e06c120036f8ce65ddfcabe917d0c9d0863961940c11acb5650e48bba8a456e. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USLF50801219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2917d13b7620ea9c8c3c5689a94f2efee508902e8f85d21847be3aec2388f6bd. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USLF50801233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1381f84af54bbcf77113f1795d99298b2f519cab9a1e8173587d5429d6444c. 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/USLF50801242.