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 0x513b722c35293690a64986c468b77eb611370ac342efdd8a339b4fe093ee37b9. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5e5090d-474e-4347-826b-b2b9b71b5b12.json and https://artists.proofprofile.net/proofs/artist/a5e5090d-474e-4347-826b-b2b9b71b5b12.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bruch, Sibelius & Others: Works for 2 Violas
5 Pieces for 2 Violins & Piano (Arr. for 2 Violas & Piano by Lev Atovmyan & Mamiko Kobayakawa): No. 1, Prelude. Moderato
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 0xc7a4dc662ba4966727f61f947b6271bb4baeb59ae177b04a2f517071e7816531. 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/DEAD62207211.
5 Pieces for 2 Violins & Piano (Arr. for 2 Violas & Piano by Lev Atovmyan & Mamiko Kobayakawa): No. 3, Elegy. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d07ea86e5a9cdedcbb17343ffbf79c6dca04c02f5ebcbad69e1295ff6acb996. 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/DEAD62207213.
5 Pieces for 2 Violins & Piano (Arr. for 2 Violas & Piano by Lev Atovmyan & Mamiko Kobayakawa): No. 4, Waltz. Tempo di valse, moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa552b4431ee71166ca60fa115ef6055bf79ce61737a3771301445ed475be5a. 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/DEAD62207214.
Dmitri Shostakovich - Five Pieces - Prelude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a4dc662ba4966727f61f947b6271bb4baeb59ae177b04a2f517071e7816531. 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/DEAD62207211.