Prezi is a presentation software company founded in 2009 in Budapest. As of 2025, they have more than 160 million users worldwide who have created approximately 400 million presentations. In 2019, the
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 0x65ca7f308c0b276fff849f626888a0f1383c857b10bc8f7f7acdbad7857c55e7. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44cc9134-4144-4209-ad94-c84e19c0b4fb.json and https://artists.proofprofile.net/proofs/artist/44cc9134-4144-4209-ad94-c84e19c0b4fb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).