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 0x7a9cfa30994f8c48cc012c8965d4c2125215f5b6e2ac6f7c70589f8b614062cf. Chain 2 (Bitcoin): anchored in block 953932 (2026-06-16T11:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f241ff8-0b7d-455c-8d5d-b6da99037dc5.json and https://artists.proofprofile.net/proofs/artist/1f241ff8-0b7d-455c-8d5d-b6da99037dc5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Baroque Trumpet (The Art Of The), Vol. 2
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 0x043f9f5319e84d3a76d3f179f6f80b2cf0c56c6b681a6b41aaab7c6833070d71. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKI199715401.
Trumpet Sonata No. 3, "Detta del Niccolini"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4422219306286124d5c3f51400474f05f65e9f3b261a0bb8bc35658aa7d8b0bf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKI199715402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7e8d26aaf76e79bc2bd8413290783c31adbfb8e4b5122de34cd96677026d90. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKI199715406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a12f434a9604a13f877991e0d10c96a6db5a70af13c2180c7d0f62a2d8c57fe. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI199715408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d274f62f24a046c5a29cd6b47be842bb9f69ae511819e70515f1a3f733f296. 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/HKI199715409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f470d3b15dbaa3f9ac18bcde8fbc9d6e86044454b2197f61935405f317ddaf6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FROV61820918.
Le Bourgeois gentilhomme, LWV 43: Marche pour la cérémonie des Turcs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0400bc5592e55812238109e3a4436b005d31d0f3d67d3a004acc3aa47004da. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/FROV61820923.
J.S. Bach: Suites a Violoncello Solo, BWV 1010-1012
J.S. Bach: Suites a Violoncello Solo BWV 1007-1009
Forgotten Virtuosi, Violin showpieces from the early 17th century
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043f9f5319e84d3a76d3f179f6f80b2cf0c56c6b681a6b41aaab7c6833070d71. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HKI199715401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a12f434a9604a13f877991e0d10c96a6db5a70af13c2180c7d0f62a2d8c57fe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKI199715408.