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Questions tagged [randomness]

158 questions
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Are future block hashes viable as an RNG?

Let's say I want to make a gambling contract. Anyone can call the createWager function to create a new bet to flip a coin. When they win, in order to collect the payment for the wager, they have to call the collectPayment function, which uses the…
Jay
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How can the "Random Beacon" proposal guard against bribes?

The Random Beacon proposal suggests a scheme where K-of-N signatures are used to sign a random number. It suggests that the only way for a random number to be corrupted if all K signers are corrupt; it takes only one honest signer to make the…
MaiaVictor
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Rolling a die at some point in the future

This question has been asked previously by someone else but the answers weren't quite sufficient. I want to write a simple contract that will yield an immutable 'random' number after a period of time. My thought is to write it with reference to the…
Richard Boland
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Random number between 0 and 1 - quick little question

I know that the topic of random number has been discussed tremendous amount of times already but I have one small question. I need to get a pseudo random number (not ungamealbe), as simply as possible. The problem is that I need the number to be…
lemme
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Need of a random number oracle

I am looking for the less gas consuming random number generator. I think i need an oracle but can you direct me to the best ? Thanks
Nova Lova
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How bad are future blockhashes as source of entropy exactly?

This is not a duplicate (see below) Before you answer “bad, the miner can influence them”, please let me specify the question. It’s clear that things like timestamp should not flow into a random number computation because the miner mining the block…
matthias_buehlmann
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Is the blockhash enough for a treasure generating function?

Suppose your contract has a function which generates a random treasure, as illustrated below: function generateTreasure() returns (Treasure) { if (msg.value < 1 ether) return; // cost of calling the message uint8 rnd = randomUint8(); if…
MaiaVictor
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How can I securely generate a random number in my smart contract at POA?

I heard that a block of random function results can be dropped by a malicious miner. Can POA prevent this? How can I securely generate a random number in my smart contract?
KIMS
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Accessing RANDAO value from a smart contract

is there a way to access the block randomness from within a smart contract or does the value reside only on the consensus layer?
Jan Beneš
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Create a random number (that no one knows) at time A and reveal it when event B occurs

Similar things have been discussed before, but the requirement is - no one (no one non neutral that is) should have access to the secret before the reveal, so commit-and-reveal scheme doesn't work. If we had an honest neutral custodian this would be…
Phosphorescent
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Can this simple RNG be hacked?

For a game I have implemented Chainlink VRF and a basic RNG for small games where the fee of Chainlink wouldn't make sense. For the 3rd parameter to abi.encodePacked (some seed data? docs suck so not exactly sure), I pass all the public keys of…
Dominic
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