The Orco (, that is lit. Water of gold; Naturalis historia liber III - 118, Pliny the Elder, 77 d.C.) is an Italian river. It originates in the Piedmontese slopes of Gran Paradiso and after about rea
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 0x01d5fc6f8ce8366aead253d61c02a286921c4e195bbc2fcf0e9dcbbcd61cd741. Chain 2 (Bitcoin): anchored in block 953888 (2026-06-16T04:55:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0cba31ab-cefa-4cc9-b459-19ec8de7ea23.json and https://artists.proofprofile.net/proofs/artist/0cba31ab-cefa-4cc9-b459-19ec8de7ea23.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).