thumb|Zygmunt Stojowski. thumb|Zygmunt Stojowski and Ernest Schelling in 1917 thumb|Stojowski in 1916 at his piano. thumb|Signature as Sigismund Stojowski, 11 September 1945, New York Zygmunt Denis
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 0x6c5916ea8c72f4626aecee6f21a379440c78de09ecfd25a3bc94ed6ce6135483. 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/bf36da50-3ebc-4f20-9203-98440a3ecd51.json and https://artists.proofprofile.net/proofs/artist/bf36da50-3ebc-4f20-9203-98440a3ecd51.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violin Concerto in G Minor, Op. 22: I. Allegro deciso
Stojowski & Wieniawski: Violin Concertos (Hyperion Romantic Violin Concerto 20)
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 0x6b84fd3770c2eb8479762c1df27b9d32e5cdb011db542d2fda1313fbf87c5f82. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBAJY1610201.