Posi, POSI, or pozi can refer to: Engineering Pozidriv, a type of screw head and screwdriver Positraction, or any kind of limited slip differential gear Music Posi music, or positive music, a mot
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 0x0fb70b69dff48f49d13ba8c84a6f936767f09c8be2482f8f277c32d7e491abb7. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/30a65824-b613-4f05-af6f-2e9b39e6a7ef.json and https://artists.proofprofile.net/proofs/artist/30a65824-b613-4f05-af6f-2e9b39e6a7ef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).