Backside may refer to: Frontside and backside, terms in action sports for whether the athlete faces toward or away from an obstacle Backside, a term for the buttocks Backside, a term in horse racing
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 0xf1e16eaedfa70ad99034c64c0e817b377c760be5634439fb437e241182e92bf1. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/582f8f1a-8a9c-47e7-924a-20d83f33256d.json and https://artists.proofprofile.net/proofs/artist/582f8f1a-8a9c-47e7-924a-20d83f33256d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).