How Does Anti Cheat Work in Crypto Games?

Players often use "anti-cheat" to mean software running on a PC. That software can matter, but it isn't the whole job. A fair game has to settle several different questions: what happened, what looks suspicious, what violates policy, and what an outsider can verify later.

That division of labor is how anti-cheat works in practice. Prevention refuses an invalid action, detection raises a signal, enforcement makes a policy decision, and auditability leaves a record to inspect afterward.

Bundle all of that into one "cheat-proof" badge and the badge stops meaning much.

In a server authoritative game, the client asks to act instead of declaring the outcome. The player might request movement, play a card, spend a resource, or claim a reward. The authority checks that request against the official version of the match state, applies the rules, then returns the accepted result.

Unity's server authority documentation calls the server the source of truth for important data such as progress and scores. Heroic Labs draws the same boundary in its authoritative multiplayer model: the server validates gameplay exchanges and broadcasts accepted state changes.

This closes off a large class of nonsense. A client can't simply announce that its inventory doubled or that an impossible move succeeded when the authority recomputes the transition. Validation can cover turn order, balances, cooldowns, ownership, position, and any other rule visible to the authority.

Automation complicates the picture. A bot can choose only legal moves, so every request passes validation while the input method still violates policy or produces inhuman consistency. The server sees allowed actions. It doesn't automatically see the decision process behind them.

Riot's April 11, 2024 League of Legends anti-cheat report is a useful counterexample. Riot described League as authoritative, yet called input automation its main cheating problem. The report says one-use, honeypot-style detections placed in the client during 2023 found that as many as one in fifteen games globally contained a scripter or botter in the months before publication. That is Riot's operator-reported measurement for League in that period, not a rate for crypto games.

Client integrity software can add evidence by inspecting the local environment and raising the cost of known tampering. Still, the player's device remains outside the game's complete control. Treating any client as permanently trustworthy would be wishful thinking with a loading screen.

Telemetry starts where immediate validation runs out of sight. One legal action says little. Repeated machine-flat timing, linked accounts feeding each other wins, or progression that makes no sense over time can tell a different story.

Operators have a real disclosure trade-off here. Publishing exact thresholds would hand cheaters a dodge guide. Hiding everything leaves honest players unable to judge a flag or challenge a bad call. A credible operator can describe evidence categories, observation windows, review safeguards, and correction paths without exposing the tuning details.

A signal isn't a conviction. Network trouble, accessibility tools, unusual skill, shared hardware, and weird edge cases can muddy the picture. Sensible detection combines evidence over time and keeps enough context for review. Bad detection turns an odd data point into an irreversible verdict.

Macros show why policy matters. A macro may produce mechanically valid inputs, yet the game can still prohibit that input method in a competitive queue. "The server accepted it" answers only whether the action fit the encoded state rules.

The same split appears in bot-heavy crypto games. DegenLoot's Splinterlands bot-fairness case study covers one ladder's policy and competitive consequences. A game can openly allow automation in one queue and forbid it in another. Computing didn't change. The rules did.

A detector doesn't issue moral truth. It opens a case. The game still needs an evidence standard, a penalty that fits, and a way to fix a bad call. Software may handle routine cases, but the operator owns the ban.

Enforcement needn't mean one giant hammer. Activision's Call of Duty security and enforcement policy lists warnings, limited matchmaking, ranked restrictions, in-game mitigations, hardware bans, stat or inventory corrections, leaderboard corrections, suspensions, and permanent bans. It also distinguishes appeal rights by outcome, including appeals for permanent bans but not hardware bans.

That range matters. A manipulated leaderboard may need correction. An invalid reward may need reversal. Suspicion may justify investigation rather than an instant permanent ban. Appeals aren't customer-support decoration when automated or probabilistic evidence can be wrong.

Crypto makes the remedy question messier. A ban might remove queue access while leaving tokens transferable. Reversing a game result may not unwind an external trade. One person can return with several wallets. Publishing a contract address solves none of that.

Moderation can be slow, inconsistent, or opaque. Blockchain doesn't rescue a weak policy team. At most, it gives players and investigators a better record of selected events.

A blockchain game records some combination of assets, transactions, commitments, or game logic on-chain. That doesn't mean the chain runs the match.

An on-chain contract can track which address owns an asset, process transfers, preserve commitments, order transactions, and execute deterministic rules over supplied inputs. Ethereum's ERC-721 documentation describes address-level ownership, approvals, transfers, and transfer events. That makes the token's recorded custody independently inspectable, not the human behind the address.

A contract can also make a selected computation reproducible. Give disclosed logic the same recorded inputs and observers can check whether the resulting state follows the code.

Blockchain can do more than decorate a pitch deck. A CoNEXT paper published in 2018 moved definitive multiplayer Doom state and validation into a Hyperledger Fabric prototype. The researchers reported validation latency below 150 milliseconds with 32 geographically distributed peers. The topic researcher verified those figures against the full paper PDF. The paper also excluded collusion, reflex-enhancing automation, and cheats involving client-only hidden state from its solution.

That is a much more credible claim than "blockchain stops cheating." The prototype tackled a defined class of state inconsistency and named what sat outside its view. Consensus can reject reports that conflict with known state. Unknown facts remain unknown.

This is where blockchain games often get tangled with provably fair systems. DegenLoot's provably fair definition explains commitments, disclosed inputs, and result recomputation. A separate checker walkthrough shows how a player can verify a recorded result. Both are useful. Neither proves that a human chose the input or that players didn't coordinate elsewhere.

Public state can become a cheat surface

More transparency isn't automatically fairer. Solidity's security guidance for version 0.8.30 warns that everything used in a smart contract is publicly visible, even variables marked private.

That is awkward for secret hands, hidden movement, unrevealed choices, and private randomness. Publishing sensitive state too early can give players information the rules intended to hide. Commitments and off-chain systems can limit exposure, but each adds another boundary the game should explain.

Funny how "put it all on-chain" stops sounding simple once the cards need to stay face down.

The clean test for any blockchain game anti-cheat claim is simple: what data crossed the chain's observation boundary? Consensus can agree on submitted data and code execution. It can't turn an unobserved fact into truth.

A signature is not a person

A valid signature shows that a key authorized an action. Ethereum's account documentation says an externally owned account is controlled by whoever holds its private keys. NIST identity-proofing guidance treats connecting an online subject to a real-life person as a separate process.

So a wallet signature doesn't show that one named human personally made the decision. Shared keys, delegated signing, automation, and one person controlling many accounts all remain possible.

Legal input can still be automated

The chain receives transactions or game inputs. It doesn't inspect every process, peripheral, memory state, display path, or source of decision-making on a player's device. Writing a final result to a ledger later can't clean up its origin.

Bots and macros may stay inside the legal action space. Deterministic validation can accept every move while telemetry, client signals, account friction, and policy enforcement handle the automation question imperfectly. This is a genuine limit, not proof that those other controls are useless.

Collusion lives elsewhere

Two players can coordinate through voice chat or private messages, then submit individually valid actions. The CoNEXT paper cited earlier excluded that out-of-band coordination from its prototype.

The ledger can show the moves. Motive may never touch it.

Off-chain facts have the same problem. Ethereum's oracle documentation says smart contracts can't access outside information by default and depend on correct oracle data. A contract may process a false report exactly as written and preserve it forever. Perfect execution doesn't repair a false premise.

Forget the vendor badge for a minute. Five questions reveal far more.

1. Who owns the official game state, and what does that authority actually validate?
2. Which legal-looking behaviors does the conduct policy still prohibit?
3. What evidence, remedies, corrections, and appeals exist when detection raises a flag?
4. What reaches the chain, and who supplies any off-chain facts?
5. Does public state expose information the game is supposed to hide?

Look for narrow answers. "We validate every move recorded by this contract" is testable. "Our game is cheat-proof" bundles state validity, device integrity, player identity, behavior, policy, and enforcement into one foggy promise.

Nobody has published enough comparable evidence to crown a universal anti-cheat winner. Distrust the loudest badge. The useful claim shows who owns the state, what gets reviewed, and what the system cannot see. That's how anti-cheat works when a team is being honest about its limits. Anything louder deserves side-eye.