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 0xf79f5a8f5eaf73364c3e01760ad7a2f2b0aff4a7c562dad33cfba7f714a3fff3. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8c680b38-8ba3-4442-a8a1-66d840a6467d.json and https://artists.proofprofile.net/proofs/artist/8c680b38-8ba3-4442-a8a1-66d840a6467d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 2 - Lustig Bewegt (À La Marcia)
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 0x525ae7e939a7b373b33784166fa510e5678d0889a4dcef479717f14e512ed305. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ATTE41700212.
Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 3 - Andante Sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b3874be5704454ef0677f199b6cbe2c20eeb8e965fdcac202990ac8fe817d5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ATTE41700213.
Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 1 - Mäßig Bewegt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c39d3f5c50fa0bc680e884a0c49195e0d71a638c6bfe6266caefcb414c843c. 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/ATTE41700211.
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
Fifteen Easy Melodic-Harmonic Etudes with an Accompaniment of a Second Cello: No. 4 - Leicht Bewegt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83402cce3db226e91b30ba046d2a92e787c323a7300f205eae87ac045b4a259. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/ATTE41700214.