How to generate random numbers in Solidity?

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[brunorocha]

Awesome, best video explaining random number in Solidity I watched so far... thank you

[francoisguyot]

How is that not manipulable ? the rand variable is stored on chain and foo() will be called afterwards, looks like everything can be predicted isn't it ?

[simonbachmann]

1. The miner cannot manipulate block difficulty as you say at 3:52. This is set by the network.
2. He cannot manipulate "now" either as this is also included in the hashing process when doing the mining. Changing "now" would change the hash.
The only influence a miner has is to withhold a block from publishing. If the random number is used for a lottery and the price of the lottery is really high, it might be more lucrative to not publish a block but have another chance in the lottery. The best way to do it is with the "Lock Commit Reveal" pattern. Maybe you can do a video on this.

[jomoljaison]

Sir, I want to create random string like A5Ed012.Please help

[Photographerindian]

Thanks bro your videos are very helpfull

[Клоунеско]

Yo bro! Cool content but did not show how the contract interacts with Oracle!!!

[pauleth]

Neither of these ways is the true randomness.

[JFKTLA]

omg you just showed me how to make a million dollars.. ill remember your wallet friend :P