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Roblox's server authority beta is almost here! It prevents clientside hacks by making the server the final decider of what actually happened. You have to provide inputs that the server equally consumes or else the client will mispredict and rollback.

Max ¯\_(ツ)_/¯

146,401 subscribers

63,064 views • 6 months ago •via X (Twitter)

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Server authoritative movement with client prediction and rollback/replay support. In this example, the client exploits by moving a wall out of the way. But the server owns the movement. The client has failed predictions due to the exploit, and rolls back. #RobloxDev

Server authoritative movement with client prediction and rollback/replay support. In this example, the client exploits by moving a wall out of the way. But the server owns the movement. The client has failed predictions due to the exploit, and rolls back. #RobloxDev

sleitnick

20,523 views • 1 year ago

Heh, someone found the FFlags that enable Roblox's WIP server authorative simulation model on production. It's still a WIP, but it's already really damn cool. No more clientside teleport hacks!

Heh, someone found the FFlags that enable Roblox's WIP server authorative simulation model on production. It's still a WIP, but it's already really damn cool. No more clientside teleport hacks!

Max ¯\_(ツ)_/¯

34,779 views • 11 months ago

ByBit Hack was completely avoidable! This industry needs to grow up! Veritaseum’s VeADIR Platform (Video: April 2018) Server-less Architecture There is no server, it just exists as computer code. the VeADIR creates a temporary server that is distributed across multiple computers, when there is a need for it, it creates a server, executes the programmable Smart Contracts then destroys itself. Which means in order to hack it, you need to find out where the server is, get through whatever security there is for that server cloud, then actually hack the server itself, and you have to do all that in the 4-5 seconds it is in existence. If you do succeed in doing all that which is unlikely, the only thing you could force it to do is what it was designed to do which was to buy or sell that asset. And, theoretically you’d have to pay the VERI fee to do it.

ByBit Hack was completely avoidable! This industry needs to grow up! Veritaseum’s VeADIR Platform (Video: April 2018) Server-less Architecture There is no server, it just exists as computer code. the VeADIR creates a temporary server that is distributed across multiple computers, when there is a need for it, it creates a server, executes the programmable Smart Contracts then destroys itself. Which means in order to hack it, you need to find out where the server is, get through whatever security there is for that server cloud, then actually hack the server itself, and you have to do all that in the 4-5 seconds it is in existence. If you do succeed in doing all that which is unlikely, the only thing you could force it to do is what it was designed to do which was to buy or sell that asset. And, theoretically you’d have to pay the VERI fee to do it.

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If you’re playing on MonkeyTilt, the outcome might already be decided BEFORE you bet “The cryptography behind every bet has always been sound” We tested it It isn’t... we sent two different client seeds for the same nonce same result both times the server is ignoring the client seed entirely the player has ZERO influence on outcomes — what we did — opened the MonkeyTilt provably fair verifier with a revealed server seed entered nonce 1 → got 3.04x changed the client seed same server seed, same nonce → 3.04x changed it again → 3.04x the client seed has ZERO effect on the outcome — why this matters — in a provably fair system the outcome is derived from: -server seed -client seed -nonce the client seed exists so the player contributes randomness the server CAN’T predict if it’s ignored the server knows every outcome BEFORE you bet the hash commitment proves nothing because the server already controls all the inputs — not a frontend bug — we checked the network traffic the verifier sends a WebSocket request with: -client seed -server seed -nonce the server receives different client seeds and returns the same result anyway request 1 → client_seed “Clientseed123456789” → 3.04x request 2 → client_seed “NEWSEED12345” → 3.04x this is the server ignoring input not a display issue — live bet traffic — placing a Limbo bet returns: -random_multiplier -total_payout -round_closed that’s it no hash no seed reference no nonce no proof seeds are fetched from a separate endpoint game engine and seed system are DISCONNECTED — nonce verification — you can only verify nonces you’ve already played in a real system all outcomes are predetermined once the server seed is committed - they’re deterministic blocking future nonces suggests results don’t exist until you bet — summary — -client seed ignored by server -no cryptographic proof in bet responses -game engine and seed system DISCONNECTED -nonce verification restricted this isn’t provably fair it looks like provably fair UI on top of server side RNG MonkeyTilt should probably address this anyone can verify this themselves in 60 seconds - open the verifier, change the client seed, watch the result stay the same

If you’re playing on MonkeyTilt, the outcome might already be decided BEFORE you bet “The cryptography behind every bet has always been sound” We tested it It isn’t... we sent two different client seeds for the same nonce same result both times the server is ignoring the client seed entirely the player has ZERO influence on outcomes — what we did — opened the MonkeyTilt provably fair verifier with a revealed server seed entered nonce 1 → got 3.04x changed the client seed same server seed, same nonce → 3.04x changed it again → 3.04x the client seed has ZERO effect on the outcome — why this matters — in a provably fair system the outcome is derived from: -server seed -client seed -nonce the client seed exists so the player contributes randomness the server CAN’T predict if it’s ignored the server knows every outcome BEFORE you bet the hash commitment proves nothing because the server already controls all the inputs — not a frontend bug — we checked the network traffic the verifier sends a WebSocket request with: -client seed -server seed -nonce the server receives different client seeds and returns the same result anyway request 1 → client_seed “Clientseed123456789” → 3.04x request 2 → client_seed “NEWSEED12345” → 3.04x this is the server ignoring input not a display issue — live bet traffic — placing a Limbo bet returns: -random_multiplier -total_payout -round_closed that’s it no hash no seed reference no nonce no proof seeds are fetched from a separate endpoint game engine and seed system are DISCONNECTED — nonce verification — you can only verify nonces you’ve already played in a real system all outcomes are predetermined once the server seed is committed - they’re deterministic blocking future nonces suggests results don’t exist until you bet — summary — -client seed ignored by server -no cryptographic proof in bet responses -game engine and seed system DISCONNECTED -nonce verification restricted this isn’t provably fair it looks like provably fair UI on top of server side RNG MonkeyTilt should probably address this anyone can verify this themselves in 60 seconds - open the verifier, change the client seed, watch the result stay the same

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In LiveView, we keep the state in one place - the server - and it simplifies a lot. But sometimes the state on the client is preferred, or even necessary, and we can't use LiveView for that part. Unless we have a LiveView that runs on the client 👀 Using Popcorn, we managed to run LiveView fully in the browser – here's a POC 🎉 The approach is to have a fully client-side LiveView rendered by a server-side one, and they can communicate with each other. Try it out:

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