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 0xd1d6c2ac694780315bc41c584ba2c6f5a2a36609970f0df621fa96ddf958469e. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/18d09b3c-e7b4-4ada-a0bb-8523604c4c4b.json and https://artists.proofprofile.net/proofs/artist/18d09b3c-e7b4-4ada-a0bb-8523604c4c4b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Rossini: Andante e tema con variazioni in E-Flat Major
Orchestra dell'Accademia Nazionale di Santa Cecilia
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 0xefe3ef21b87c0a7b8f18a407ac6c00704b89b50977e3375e60cb9d2269ad4902. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1402211 — a six-check JSON result.
Sinfonia concertante in E-Flat Major, K. 297b: I. Allegro
Mozart: Sinfonia concertante in E-flat major, K. 297b
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c17d14286957bcbce1a6a6dca5f6bdb339d7a385ffb075db233246a551dc196. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD542001280 — a six-check JSON result.
Sinfonia concertante in E-Flat Major, K. 297b: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c64e0a506a5ee5312f08b4c789aeb30be550d02e9ce9249d410f310f1f5a987. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD542001281 — a six-check JSON result.
Sinfonia concertante in E-Flat Major, K. 297b: III. Andantino con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12bd57fa7f7ea1dd4d0eb2ddfeffb65125434fae1c057f68f657363ab860862. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD542001282 — a six-check JSON result.