Ocho is the Spanish word for eight. Ocho may also refer to: Ōchō, a Japanese era name Ocho, a figure "eight" in Argentine tango dance Mount Ōchō, a peak in Okuetsu Kōgen Prefectural Natural Park
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 0x2e9d010f211719c711645b9811afae5d1997eb2f58f50c8a2693be3c7a0073ee. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9830d539-7fc4-4281-9995-14604ef9d4c9.json and https://artists.proofprofile.net/proofs/artist/9830d539-7fc4-4281-9995-14604ef9d4c9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).