Popo may refer to: Entertainment Popo (album), a 1951 jazz album by Shorty Rogers and Art Pepper Mr. Popo, a character in the manga and anime series Dragon Ball Popo (film), a 2008 Dutch short fil
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 0xf8d228d3716630807dda137dc384db8b85a48e6b436a285b02f244f0356a38d0. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b07602e8-c136-4aaa-9a76-61d74a787960.json and https://artists.proofprofile.net/proofs/artist/b07602e8-c136-4aaa-9a76-61d74a787960.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).