The Osum is a river in southern Albania, one of the source rivers of the Seman. It is long and its drainage basin is . Its average discharge is . Its source is in the southwestern part of the Korçë C
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 0x7b5d8c906299b021b5a09aa802903083672c51fde5bc45d41cd3eabe646eadb8. Chain 2 (Bitcoin): anchored in block 953819 (2026-06-15T18:31:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8046165-3326-4e16-a51b-e241e00ad438.json and https://artists.proofprofile.net/proofs/artist/f8046165-3326-4e16-a51b-e241e00ad438.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).