The Stamic Quartet (Czech: Stamicovo kvarteto) is a Czech string quartet. The ensemble is named after the composer Jan Václav Antonín Stamic, because both violinists of the original line-up were born
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 0x8f501706bf529b27d7e7a2031b7eb1fac52cbb9ae8a090b7bb6e9f910e543048. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a83708d-2119-4cbb-a99f-fc863e4b3a01.json and https://artists.proofprofile.net/proofs/artist/1a83708d-2119-4cbb-a99f-fc863e4b3a01.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).