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 0x00db6943082d57f73aa1012264d7b7b7d58cbf1c6e97beae83372f9b16ab2832. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1b4cc86-e751-4281-ab49-5141b210cea6.json and https://artists.proofprofile.net/proofs/artist/e1b4cc86-e751-4281-ab49-5141b210cea6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Liszt: Conciertos para piano y orquesta No. 1 y 2
Grieg: Concierto para piano y orquesta in A Minor, Op. 16
Bruckner: Sinfonía No. 5 in B-Flat Major, WAB 105
Mendelssohn: El sueño de una noche de verano, suite instrumental, Op. 61
El sueño de una noche de verano, Op. 61: No. 9, Danza de los payasos
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 0xa4347fb37f1006e660fe3e60bc6f3090fa25233c371a28ae7c40ccfd9d75bd5e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES5338007651.
Schubert: Sinfonía No. 3 in D Major, D. 200 - Sinfonía No. 4 in C Minor, D. 417
Beethoven: Sinfonia No. 9 in D Minor, Op. 125