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 0x65b7964390f9b409401c7fa1fad583de99b8f70cdadaba919aca93453313c20d. Chain 2 (Bitcoin): anchored in block 954025 (2026-06-17T00:32:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38222da5-c56d-414c-bb47-2d19844917bb.json and https://artists.proofprofile.net/proofs/artist/38222da5-c56d-414c-bb47-2d19844917bb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Etude Op. 10 No. 4 "Inventio" in C Sharp Minor
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 0x80b83e328316cd9f01033fbb9d831b8c1e3d22fbeb3ac0e3e9cb947af5291e41. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ITEGW2400098.
Etude Op. 25 No. 1 "Iris" in a Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a419c4fae3a015422a3bbf242b69c1b09da7fe94ad414cac84600e1c189266f. 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/ITEGW2400107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0c8d0fb61ec7e5aae7610402fafb82aa1eb8efc89d35584917750fdf8adf78. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:05:14Z), 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/ITEGW2400108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474113250470fd5e45828968cc72639345444740a2e402b68f3be1df41d8f1f8. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:57:58Z), 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/ITEGW2400106.
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
Etude Op. 10 No. 1 "Praeludium" in C Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e2697786428170ae75f235b608d57c67768cf8367da574dc8689f059af90a1. 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/ITEGW2400095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b50183faa3495d0f314377dbcdd691525019a5e1d38460daf16ad995fe48c4b. 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/ITEGW2400100.
Etude Op. 10 No. 7 "Barcarolle" in C Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab4bade4825e8f3f271de9d2cdb0edcb942e1e81aa4c30f1dfcb90a429a3e67. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/ITEGW2400101.
Etude Op. 25 No. 11 "Novae Terrae" in a Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c485c900ea065690f171b90f70f82a74cd72beba75d1df75a49950495bc54cc. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ITEGW2400117.