Sopot (; or ) is a seaside resort city in the Pomeranian Voivodeship on the southern coast of the Baltic Sea in northern Poland, with a population of approximately 40,000. It has the status of county
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 0xd4113d0f6fa75151e492861bf6c8b91eb422677da53533c70e857b8cadf59c37. 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/7e67b6c5-4ca5-4ee8-a476-7549c7fe3b33.json and https://artists.proofprofile.net/proofs/artist/7e67b6c5-4ca5-4ee8-a476-7549c7fe3b33.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).