thumb|Previous Hi5 logo used until 2010. thumb|250px|Map of countries with most users of Hi5 hi5 is an American social networking service based in San Francisco, California. It is owned by The Meet Gr
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 0x5a02852b44ff4649f644a55a5cb2f52ac4f5c6c8968f664ccc24002857a4584b. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/46befe53-4e0b-401b-a687-b62320b389c7.json and https://artists.proofprofile.net/proofs/artist/46befe53-4e0b-401b-a687-b62320b389c7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).