Kronstadt (, ) is a Russian port city in Kronshtadtsky District of the federal city of Saint Petersburg, located on Kotlin Island, west of Saint Petersburg, near the head of the Gulf of Finland. It i
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 0x0fdbc0211a8b0bcb5b9f58a5b81ffef95136fe164b0d971dfce1c9a62ddbb2e9. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7fc5702f-df49-44dd-ab54-dab5b576b852.json and https://artists.proofprofile.net/proofs/artist/7fc5702f-df49-44dd-ab54-dab5b576b852.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).