Lev! (Swedish for Live!) is a long glass artwork in the pedestrian and bicycle tunnel between the Railway Station Square in central Umeå and Haga District in Sweden. It was inaugurated on 17 November
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 0xb10d30a69c4dfa009d84a16e3f4836852d677b36960dd879707c5aa2b0d87049. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/671b0ed0-17b9-4d61-b434-82936694974b.json and https://artists.proofprofile.net/proofs/artist/671b0ed0-17b9-4d61-b434-82936694974b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).