Alexander Tamir, Arie Vardi, Bracha Eden & Pnina Salzman
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 0x90410e19598f9f2681c4e6ce923f1d99e56c8f81477b5c96f05f70a95c362e41. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc236a26-6225-4d13-af69-99ac156003bb.json and https://artists.proofprofile.net/proofs/artist/fc236a26-6225-4d13-af69-99ac156003bb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach: Concerto In A Minor for 4 Pianos, Bwv 1065. First Movement
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 0xd91072bf46975e354a96ae2fab6e7f7c8ba1f703e5d674c1a985f89abb49b549. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USA561044729.
Bach: Concerto In A Minor for 4 Pianos, Bwv 1065. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696f33b1e623b022d853ca62849d4c75ab60e725196b13ad0e097fa669357317. 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/USA561044730.
Bach: Concerto In C Major for 2 Pianos, Bwv 1061. Adagio Ovvero Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc068283d9f7ffdaac736ba54325589ed6b4cfa485ca1a89ac789ce9816b194bd. 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/USA561044733.
Bach: Concerto In C Major for 2 Pianos, Bwv 1061. Fugue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5037d5f0a830091b2467df1c6f63852b7671b345a247e729e141a2752a7aaf8e. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USA561044734.
Bach: Concerto In A Minor for 4 Pianos, Bwv 1065. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223ec04e54e91b5008f6d811b22e31cf90ec811b9e46d87235a261327cc7122a. 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/USA561044731.
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
Bach: Concerto In C Major for 2 Pianos, Bwv 1061. Allegro Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaceaf75b7781146a3e01fa73e6a142c7ad71c180f75cb92fe138ebdb8de3d5df. 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/USA561044732.