How to make a provably fair coinflip site

[fishy]

I'm looking into making my own gaming site, does anyone know how to make a PROVABLY fair coinflip site?
Or would a random.org number generator suffice?

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[fishy]

No, you probably want to use the blockchain time as a seed so you know it is random.

Do you know how I can do it?  I'm a newbie kinda still! 

[gweedo]

No, you probably want to use the blockchain time as a seed so you know it is random.

Do you know how I can do it?  I'm a newbie kinda still! 

https://github.com/fireduck64/BitcoinTimestamp

[Cyberdyne]

I'm looking into making my own gaming site, does anyone know how to make a PROVABLY fair coinflip site?
Or would a random.org number generator suffice?

The only way to do this and prove fairness would be to present the user with two options A and B - one of them wins and one loses.

It would be difficult (or impossible) to prove fairness if they only had one button to choose from (such as "FLIP").

Generate a string, such as

A=WIN|B=LOSE--lots-of-random-characters-$*(#$*9*($#$
or
A=LOSE|B=WIN--lots-of-random-characters-$*(#$*9*($#$

Then show the user a sha256 hash of that string and let THEM decide which button to press, A or B.

After they have clicked a button, you can show them the secret string, and they can match it to the hash to prove fairness.

[Dabs]

A coin flip is basically 50/50 on any of the dice sites. Right? (minus house edge)

[fishy]

I'm looking into making my own gaming site, does anyone know how to make a PROVABLY fair coinflip site?
Or would a random.org number generator suffice?

The only way to do this and prove fairness would be to present the user with two options A and B - one of them wins and one loses.

It would be difficult (or impossible) to prove fairness if they only had one button to choose from (such as "FLIP").

Generate a string, such as

A=WIN|B=LOSE--lots-of-random-characters-$*(#$*9*($#$
or
A=LOSE|B=WIN--lots-of-random-characters-$*(#$*9*($#$

Then show the user a sha256 hash of that string and let THEM decide which button to press, A or B.

After they have clicked a button, you can show them the secret string, and they can match it to the hash to prove fairness.

In PHP?

[Cyberdyne]

In PHP?

Oh, you want us to develop the entire site for you? I think I gave you a good start.

PHP would be fine for writing the code.

You can use functions like mtrand() and hash().