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 0x9aca379cea0ba275894cd8bbb8eb1820a1b32b686c3bd6947ff1eac78cf943ab. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/128250c8-8308-4176-b486-34f46d5ab4ff.json and https://artists.proofprofile.net/proofs/artist/128250c8-8308-4176-b486-34f46d5ab4ff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Finland 100: A Century of Finnish Classics
Matvejeff: Ad astra & Cello Concerto - Linkola: Piano Concerto No. 1
Booming Bass and Baritone: Best Loved Opera Arias
Zajc: Nikola Šubić Zrinski, Op. 403 (Live)
Nikola Šubić Zrinski, Op. 403, Act III Sequence VIII Scene 3: Sad napred braćo (Live)
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 0xf586d1d3624b8e1132bd9b8e094fef908c030991882a2fede44d18af21d28ae4. 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/DEB201833533.
Nikola Šubić Zrinski, Op. 403, Act I Sequence II Scene 5: Nisam ja bogata roda (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6d0af85a76ba51375a410c8af4f9ee57dc996231f1623051123b454011d316. 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/DEB201833513.
Olli Virtaperko: Romer's Gap – 3 Concertos
Papandopulo: Piano Concerto No. 3 & Violin Concerto