Keila () is a town and an urban municipality in Harju County in north-western Estonia, southwest of Tallinn. As of 2025, the town has a population of 11,024 inhabitants. Keila is also the location o
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45da32066dd61614a0eff4c8c05b5cf4cc73aeff402fd6431e8cff4fd3f78d5c. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/521302b4-5906-4706-88f8-ff78f2113e16.json and https://artists.proofprofile.net/proofs/artist/521302b4-5906-4706-88f8-ff78f2113e16.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).