All Questions
Tagged with random randomness
20 questions
2
votes
1
answer
130
views
How does randomBytes or extra entropy effect in wallet generation using ethers?
I'm trying to generate new wallet using ethers.js
From the examples I got online, randomBytes(16) is used. I wonder if I put randomBytes(128) make any difference.
Does it make the wallet generation ...
- 236
0
votes
2
answers
77
views
What are the best up-to-date secure approaches of generating pseudorandom number in Solidity? [duplicate]
I am thinking about creating a lottery with more than one winner and one round for users. Please don't consider usual 'commit-reveal' scheme. However, person can claim rewards on their own at the end ...
- 13
2
votes
0
answers
171
views
Is there any natural source of entropy when running `forge test`?
I'm looking for a pseudo-random value that is different each time the command is run.
Either forge test or forge script.
- 18.7k
2
votes
0
answers
223
views
Is there an alternative to Chainlink to get a random number in a solidity contract?
I'm trying to create an NFT that selects at random between 3 json metadata files. The only way I know of to do this is to use Chainlink. I've seen one tutorial that implements "@chainlink/...
- 373
0
votes
2
answers
264
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How to generate secure and pure Randomness number without Chainlink VRF?
I found that the Chainlink VRF do not really support all the networks.
So, I am considering to use off-chain and make my oracle to generate random number.
I have a vague idea just down below
Create a ...
- 387
6
votes
1
answer
2k
views
Using block.prevrandao as randomness for Miller-Rabin Primality test
I am interested in using the new PREVRANDAO value as a source of pseudo-randomness in calculating the Miller-Rabin probabilistic primality test on-chain. Chainlink VRF is an option but ideally I would ...
- 89
2
votes
3
answers
610
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How to generate random number and get it at the same time using Chainlink VRFv2?
I need to generate random number, on a single function hit and get it there only.
I am not able to do that, due to block confirmations required which is set to min. 3.
Is there any way to get this or ...
- 120
1
vote
1
answer
16
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Link tokens required on Avg for random number generation
Can someone tell how much link tokens are required on an avg. to generate random number via VRF chainlink method??
- 120
2
votes
1
answer
203
views
Can I generate multiple random uint8 from a uint256?
The chainlink VRF returns a uint256, for my application I need a uint8. If I utilize one uint256 and break it up into separate uint8 is that still secure as a source of randomness? Also, what's the ...
- 333
1
vote
0
answers
178
views
Random number generator
I am trying to hack a random number generator contract as follows :
// SPDX-License-Identifier: MIT
pragma solidity 0.8.0;
contract Guess {
uint256 private randNonce;
uint256 private result;...
- 354
1
vote
1
answer
332
views
What is the max number of inputs that can be entered in a keccak256(abi.encodePacked()) function?
I'm learning to use the keccak function on an online Solidity tutorial, and seeing that this function takes three inputs:
uint(keccak256(abi.encodePacked(now, msg.sender, randNonce)))
made me wonder ...
user94790
0
votes
2
answers
24
views
How does delaying on-chain randomness effect the security of number guessing games?
Say a number guessing game allows users to submit their guess before block N and reveals the winning number N + 100 games later, which is random number based on the block hashes of block N until block ...
- 103
2
votes
1
answer
312
views
Randomizing values in mintable NFTs
I've read and written simple smart contracts in the past yet I'm relatively new to getting random data in a transaction, which seems to be harder than I've thought, due to the nature of determinism of ...
- 131
0
votes
1
answer
458
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Commit reveal scheme with random number -- user chooses when to reveal... possible?
I've researched commit reveal schemes, but am not sure the following is possible...
User mints a playing card. The number of card is hidden.
At anytime, the user can choose to reveal the card number.
(...
- 298
0
votes
2
answers
571
views
On-chain Random Number Generator
I've been doing some research on gasleft() (used to be msg.gas but is now deprecated) and was unable to find any specifics on how or where this value is defined. I was able to find another detailed ...
1
vote
1
answer
2k
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Chainlink VRF fulfillRandomness doesn't use enough gas to perform function - how to get it to use more?
Chainlink VRF allows users to get a random number by calling requestRandomness and then waiting for the fulfillRandomness callback to be called by the Chainlink contract.
I have a function ...
0
votes
0
answers
356
views
Alternatives to get LINK tokens in Ropsten, for RNG
Sorry if this question sounds like very newbie (and maybe it is.
I'm developing a Smart Contract which needs a random number generation, and after researching some time it seems that ChainLink VRF ...
- 1,998
0
votes
1
answer
556
views
Minereum Lucky Draw claims 100% Safe randomness on a smart contract without oracles, is it really possible? [duplicate]
Is the way Minereum Lucky Draw game works really safe 100% onchain RNG and verifiable on smart contract?
They claim yes but I would like to know expert technical answer for this, if so, isn't this a ...
- 9
0
votes
1
answer
601
views
Blockhash Minus-256 Problem [duplicate]
What is meant by Blockhash Minus-256 Problem?
I am reading an article at:
Bad Randomness
It talks about Blockhash Minus-256 problem but does not explain much about it. As a result I can’t ...
- 1,416
1
vote
1
answer
308
views
How can I convert an element of a byte32 array to number?
The array contains an SHA256 hash. I want to add up 2 hexadecimal values, and later multiply them by 1.125 (only keeping integer). The resulted number would represent an alphanumerical character, it ...
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