The Leine (; Old Saxon Lagina) is a river in Thuringia and Lower Saxony, Germany. It is a left tributary of the Aller and the Weser and is long. thumb|200px|left|Leine near Nordstemmen The river's so
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 0x57fd181002e299cfec60190984ebaa594651dee9ef16eb78ab470902c20332e0. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ff54044-0671-4483-a8a9-8fff14f6755a.json and https://artists.proofprofile.net/proofs/artist/1ff54044-0671-4483-a8a9-8fff14f6755a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).