Topic: ★★[TRUSTED][Provably Fair]★★☞☞BTC Lottery ➋➍™ ☜☜(Current Jackpot 1.5 BTC) - page 2. (Read 2024 times)

Well, I can confirm it works.
Err, mdzedzej, I accidentally sent in 0.01 this time around... Any chance you could send the excess back to me?

0.0522 BTC
http://we.lovebitco.in/raffle.html
First ticket number:1
Last ticket number:8
Last 10 digits of blockhash: b354c721fc8
Winning Ticket: 5
Winning Wallet: 1EJ4fgnVMy1WkUmYxdBJPuS2AgU8yTkA62
 

As long as you had say a running unix time stamp at the bottom of the screen and proved that there were no edits and only one random number was generated I think that would work. It would help to also have in your video time from before and after the draw to show that a new number wasn't generated if the first one was unfavorable to you. i.e. Drawing held at 07:30:xx needs to have footage from 07:29:xx all the way through 07:31:xx to prove this. If you don't  then you could randomly generate at least a few numbers during that one minute time frame until you found one that was suitable and used it.
BTW I'm not trying to imply that you would cheat, I'm just trying to help you not be accused of cheating. If you did these things and posted the winner in the chatbox and uploaded the video to youtube or whatever I think that would be good. Just make an announcement in the chatbox a few minutes before the drawing will be held letting everyone know the exact time frame of the draw.

The problem with the generation of the random number isn't the generating it part. It's finding a way to prove that you actually didn't influence the outcome. The live feed idea is good as long as you have the unix timestamp showing (which is automatically created on random.org) and have available channels for the stream (skype, livestream, etc...). Even then you would need to record it as well and upload that to the site for people to verify, plus if no one watched it live, or only a few then you could face accusations of collusion. For that to work, you really need a lot of people watching it live to verify for everyone that there was no cheating.
Like I said, I though a lot about this and different ways to work it. This was my solution, but I'm sure there are others out there that would be easier to implement and could work just as well.

Just entered.
Lets see how it goes.

BTW, I had a post about provably fair that didn't get any responses, but I couldn't think of a way that it would not be. Here it is:

I have thought alot about things being provably fair and how to ensure that. I think I have come up with a good plan and here it is:
Provably Fair

A randomly generated 7 digit number is created using Random.org and an image is uploaded online. The number and the link are then hashed (using this form: 1234567_link) and the resulting hash is displayed at the bottom of the raffle for you to verify after the raffle has concluded. Each spot in the raffle is purchased and has a unique transaction ID. The first number in this transaction ID is used i.e. c5a93b86654df5c31d04e9465e8510be1445bf1822f727fe08c31bd17f3g81ca
is registered as 5. All transaction numbers are added together (5+x+x...) until a sum is reached and that number is multiplied by the random 7 digit number. That number is then divided by the total number of entrants into the raffle to choose the hash # that will be used in the next step. The number is divided by the total number of entrants as many times as needed until a suitable number is reached. All numbers are rounded to the nearest whole integer.
EXAMPLE: If the random number was 8349215, the transactions total was 27, and the total number of spots in the raffle are 11.
8349215*27=225428805    225428805/11=20493527.7273
That number then divided again and again by 11 eventually gives you 11.56... which would be round up to 12 meaning we would have to divide again to get 1.0516... meaning the first spot in the raffle will be chosen to provide the hash.
The last 10 digits of the hash will then be input at http://we.lovebitco.in/raffle.html with the correct number of entrants and the winner of the raffle will be chosen.

Ah hell, I'll give it a go

How do we know it wasn't you who chose the number? There will be no way to prove it was chosen by that site.

How is the random number chosen?

Provably fair?