How can I securely generate a random number in my smart contract?
There are a few trade-offs and key points to keep in mind in this area. Any decision that a user makes which affects the outcome gives that user an unfair advantage. Examples include: Using a blockhash, timestamp, or other miner-defined value. Keep in mind that the miner has a choice of whether to publish a block or not, so they could conceivably have one chance at the prize per block they mine. A
Where does metamask store the wallet seed? (file path)
I have a Windows installation that cannot be booted anymore. I'd like to copy the file containing the Metamask wallet seed to another machine and have that Metamask installation use it. The same Metamask accounts were installed on both Firefox and Chrome on that Windows installation. Does anyone know where the Metamask plugin stores its keys or wallet seed? (I do not have the wallet recovery phras
`external` vs `public` best practices
Apart from the public modifier Ethereum introduces the external one. Both may be called outside of the contract and inside (the later one by this.f() pattern). Moreover, according to the docs: External functions are sometimes more efficient when they receive large arrays of data. but there is no further information what does actually sometimes mean and if this efficiency gain is held also for inte
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What is the meaning of Ethereum mainnet genesis block extradata value?
What is the receive keyword in solidity?
Convert address to string
Can we get all elements stored in a mapping in the contract
What does the indexed keyword do?
Web3 create account from mnemonic + passphrase
Function with more than 16 arguments
What exactly is the Nothing-At-Stake problem?