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 0x299c9f67255c38ed384e550fb4dce97662f88648146656c32d126bcc44781122. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bef594b7-86fe-4cfe-b9f3-2e8fb19903b3.json and https://artists.proofprofile.net/proofs/artist/bef594b7-86fe-4cfe-b9f3-2e8fb19903b3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violin Sonata in D Major, Op. 5 No. 1: I. Grave - Allegro - Adagio
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 0x4666db04bc51930441579b006feaeb39593b616f25ec28073e598fcfd7d69327. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBASH1241201.
Violin Sonata in D Major, Op. 5 No. 1: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b3619ec88a835a4f163130fad414543d6966d41fe07351330ab0266e2ea695. 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/GBASH1241203.
Violin Sonata in D Major, Op. 5 No. 1: V. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3ce9b3405c9fd0e37403154f7793ad457d4c628bfe3b2f8450d3e8df8df1ab. 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/GBASH1241205.
Exsultate, jubilate, K. 165: I. Exsultate, jubilate. Allegro
Mozart: Coronation Mass ; Exsultate, jubilate; Vesperae Solennes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4131d14b0c726dad5ed333e1159e4b645dc2196c0c872cf23e68002346d5f1fd. 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/DEF059303181.
Exsultate, jubilate, K. 165: II. Recit. Fulget amica dies
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc1f5be5e2fc025e90baffbf21ef5e5c078d4947b2738d034c16c74ca342519. 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/DEF059303182.
Exsultate, jubilate, K. 165: III. Tu virginum corona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e825c5211bf7a4cef1486d104b92aee6bb5db3f87aa7f40af9733f2de04531b. 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/DEF059303183.