upright=1.6|thumb|Detailed empire management, seen here in Freeciv, is a central aspect of 4X strategy games. 4X (abbreviation of Explore, Expand, Exploit, Exterminate) is a subgenre of strategy-base
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 0x006f6a744495aac69dc074ceb4223ca2381efc58e31b78b4e670301247f05e20. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80b148bf-8329-4aa5-aabf-956501f16f56.json and https://artists.proofprofile.net/proofs/artist/80b148bf-8329-4aa5-aabf-956501f16f56.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).