Espoo (,"Espoo" Lexico UK Dictionary. Oxford University Press. Retrieved 10 March 2021. ; ) is a city in Finland. It is located to the west of the capital, Helsinki, in southern Uusimaa. The populatio
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 0x606864f7c7351c88721b8675118e9ae8d1aceea7da150cdf293a2c1ec43b7bd0. Chain 2 (Bitcoin): anchored in block 953762 (2026-06-15T08:21:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b9caa8e4-ecf3-4b44-90b3-9388fc560c6d.json and https://artists.proofprofile.net/proofs/artist/b9caa8e4-ecf3-4b44-90b3-9388fc560c6d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).