Robert Leroy Johnson (May 8, 1911August 16, 1938) was an American blues musician and songwriter. His singing, guitar playing and songwriting on his landmark 1936 and 1937 recordings have influenced la
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 0xbfd8f6732a2442df920c1cf4d62e5eb961874a69d8a7f6f06d6827b77f198642. 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/198091eb-d98b-4a79-9f47-4cdee26e282a.json and https://artists.proofprofile.net/proofs/artist/198091eb-d98b-4a79-9f47-4cdee26e282a.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 0x8704d6669994c289e24fc0831ce2238a7ab68d8400056827960f33dbd4d4c044. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSM13600025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3151f9fac70437b9b9076b578554fac94afcf0543c2b6dedb7acbdbc34f80b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSM13600027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc685c08d502a066d7f1dc2cdc78bf98086f12a5bd14a51727e31cc8582dc988. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USSM13600034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80da9a5b19d401ff633f75dd4df65d3fbf21729670d4d07e8c1f3f58bc4c4f63. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USSM13600035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5536998bdb5ab4030595c0a3979e82b8cf7f35e860f827215d5d58ffe25462f. 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/USSM11505860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebefe882acb97ec27277d12b0cb05f46a1e782f64497929580607bc12870039. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBF076623590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5983ac5bb9afddfecbdeca13786bcbc9a017274240e32d646b811d81ce35a07. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF076822660.
Divertimento No. 17 in D Major, K. 334: III. Menuetto & Trio
Wolfgang Amadeus Mozart: Essential Chamber Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d66b9ddeb24db7c3f44c21923fd5f30098e26ba3cc17383652dfb9301e128d5. 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/USZDG0601971.