Topic: 10 BTC Drawing! 0.05 BTC entry, 1st drawing completed, closed for now (Read 4315 times)

Yay I win! 

The drawing occurred tonight as requested by Lightlord, dooglus watched.

Here are the eleven drawn numbers and respective prizes:
Prize: .10 BTC    Number:50.2018  Roll ID: #90818338
Prize: .10 BTC    Number:08.5174  Roll ID: #90819020
Prize: .10 BTC    Number:84.1474  Roll ID: #90820253
Prize: .10 BTC    Number:67.3715  Roll ID: #90820696
Prize: .50 BTC    Number:20.0193  Roll ID: #90821263
Prize: .50 BTC    Number:70.7589  Roll ID: #90821916
Prize: .50 BTC    Number:23.8720  Roll ID: #90822341
Prize: 1 BTC      Number:55.8300   Roll ID: #90823134
Prize: 1 BTC      Number:09.7348   Roll ID: #90823752
Prize: 2 BTC      Number:08.3305   Roll ID: #90824627
Prize: 4 BTC      Number:56.6416   Roll ID: #90825384

Lightlord bought 196 tickets thus winning any time the number drawn was >01.99.99, which was all 11 draws.
9.9 BTC sent to him here: https://blockchain.info/tx/a8dc7b43939665668195ba495d844bec881251a440d1cba009103c77aabd5024

Here's a log of the draw:

Can it be done tonight?

Woah! Haha wow. We will hold the drawing tomorrow. Will post specific time / date. If you would rather it be held tonight LightLord since you are by far the person who bought the most tickets let me know and we'll do it tonight. Thanks man!

Send 9.8 BTC for 196 Tickets.

Transaction ID:

https://blockchain.info/tx/03531729748e91d073546c64a3573f3ad7bc0bf437cf9bc3ae9e240379656b47
Address: 18hR9DrRsUqrpdM5V4ZZEqaGryMYbdDsan


1) address
2) Lightlord owns
3) signature.


18hR9DrRsUqrpdM5V4ZZEqaGryMYbdDsan


Lightlord Owns this address


H9lZ6BR0cgA5RnhTPP8pmURHCFX8SJNbWqPCukiPGkzmLyNfpWA+WslZpgASa2iIblEZV/1T89jlnTHJojrTcVk=

4 Tickets sold so far! Back at it tomorrow. I am determined to make this drawing occur and not slowly fade away in the gambling section like so many other threads. Join now guys!

You might need a better user seed to people not accuse you, something like each unique buyer sending its own piece of the seed, and concatenating them as before.

I strongly suggesting doing the rolls this way.

Okay I will look into this. I don't understand coding or entering in the stuff, so if I can duplicate this I could use this if others want me to.

I'm not sure if you ignored what I wrote or you misunderstood it completely, so I will do an actual example that you can replicate and use for your own lottery and will be fairer for everyone involved.

The code is based on the lines in yellow at https://github.com/knowitnothing/misc/blob/master/justdice/no_browser_bot/browserless_dummy.py#L1-L23

Now you are planning to start selling your tickets, let's say that. So you generate a secret seed:

secret = gen_server_seed()

And publish its hash by doing:

secret_hash = hashlib.sha256(secret).hexdigest()

For the secret I obtained, secret_hash == "ec11a5e6acac0cd3513bab4d12a31175ea40a61867b56e766d29d7390ddcc8c4". So you publish (i.e., write it in your post) it and then actually start selling the tickets.

Now for the user seed: pick the first two letters from each address received, according to the ordering you will be using for the prizes, and concatenate them all. So let's say the user seed turned out to be "abcdefghijklmnop" (i.e., you sold eight tickets). So now the period for buying tickets ended, and then you do the rolls starting with nonce at 1. Suppose you want 10 rolls:


for i in xrange(1, 10 + 1):
     print 'roll %d: %s' % (i, dice_roll(secret, user_seed, nonce=i))


Using the secret I obtained earlier, and that everyone already knows its hash, I obtain the following rolls:

roll 1: 19.2738
roll 2: 89.8953
roll 3: 16.2619
roll 4: 12.9331
roll 5: 93.4046
roll 6: 53.9519
roll 7: 53.4825
roll 8: 39.0345
roll 9: 55.241
roll 10: 28.1354

The secret seed used was "Cdg7b8z6ZHvX5MTMsS8yGUsnizL_Emi.kO6wtjnTLMYuY0ArpFDm25qcwsJ521rk". How can you cheat this ?

You're right Dooglus - We will be using the order the .05 are rec'd according to:
http://blockexplorer.com/address/1EaG64J9UvEPzcamBAeZeP5AmzP8ieBDxn

1st rec'd gets the first ticket, 2nd .05 rec'd gets 2nd ticket and so on.

I think blockchain.info shows them in a random order.  It would be better to use blockexplorer.com because that shows the transactions in the same order as they appear on the blockchain.

See this screenshot of the two sites side by side to see how they disagree on transaction ordering:

Because how would drawing a secret without anyone else seeing be able to prevent me from basically redrawing the secret so that a certain address would win (thus someone would say I own that address that won 4 BTC). If I use OpenSSL to draw secret seeds, someone else would have to verify that I did not draw more then 1 or draw more then 11 whichever people decide. I would have to record it I guess and still people could say, you recorded it more then once. Thus, the fairest way I see it, is to use someone else's dice site which has public lookup of draws, to prove I only drew 11 times or however many was needed to pick 11 winners.

Blochchain.info. You look up the wallet address and the first rec'd .05 would get the first ticket. When the balance of the wallet is 9.95 BTC then the next .05 BTC would get the 200th ticket.

I'm not seeing how this is complicated, care to explain ? I'm not seeing how people are going to accuse you if you do the way I mentioned.

That couldn't be less clear.

Do you mean on the blockchain, or on blockchain.info?  Because they're different.

I could possibly do that, the problem is doing multiple rolls, it could become very complicated and leave room for accusation or something.

Also, not realizing this possible flaw beforehand, I am now going to be pressing "randomize" to change the server seed before the 11 or however many draws. This is to prevent Dooglus from seeing what 10 numbers would be drawn and thus buying those specific tickets to win. Updated the OP to include this rule.

Uhm, you should actually post the hash of the secret seed, let people collectively decide on a user seed, and use an offline system for doing the rolls so we all can be (twice) sure that the nonce is starting on 1. If you need, I can point to some code that does the rolls exactly in the same manner that just-dice does, and the secret seed is also picked by using OpenSSL.

Yes its in order of transaction ID's on blockchain. 1st .05 received would have the first ticket and so on.

I'm OK with this, and can provide a list of the numbers rolled by account 99900.

How are you determining the order of the tickets?  I would imagine it's based on the order of their transactions in the blockchain, but it would be worth stating that.  Note that blockchain.info and blockexplorer.com show transactions in different orders.  I believe blockexplorer.com shows them in the same order as they actually appear in the block, so that would be the one to use.

Hi guys,
I am interested in setting up a fixed pool drawing, hopefully one that can grow to as much as 50 BTC if popular. For this one though, I am going to start with a set 10 BTC pool, where there are 200 tickets, each costing .05 BTC.
Here is how it will work:
Each ticket costs 0.05 BTC (roughly $5 in USD), and there will a total of 11 winners.
Prizes:
4 BTC - 1 winner
2 BTC - 1 winner
1 BTC - 2 winners
0.50 BTC - 3 winners
0.10 BTC - 4 winners
Total paid of 10 BTC = 9.90 BTC, I keep .10 BTC and pay the tx fees.

Tickets sold so far: 4 / 200.

How will it be provably fair?

I have thought about this and I've decided the best way, is to do it is as followed:
I am going to use Just-Dice's rolling of the dice to pick the winners. Basically I will draw 11 and only 11 numbers on the account 99900 (I own this). Before I draw ten times I will press "randomize" on the site to randomize the server seed. This will be the only time this user will be used. Each ticket of the 200 tickets gives you a .5% chance of winning. The first ticket bought will have numbers 00.00.00 to 00.49.99. The 2nd ticket bought will have 00.50.00 to 00.99.99. Third would have 01.00.00 to 01.49.99, and so on. The 200th ticket would have numbers 99.50.00 to 99.99.99.

Here is an example draw:
The first draw will be for .10 BTC, and I roll a 03.42.99, whoever bought the 7th ticket bought would be the winner. No ticket can win more then once, in the unlikely chance that a subsequent roll falls within another ticket's winning number range, a new number would be drawn/rolled. All of this will be verified by Dooglus of course (I'll ask him to post here to make sure its okay with him) for the 10 rolls and any possible following rolls. This account will not be used for real wagers, and whether the bets win will not matter, only the random numbers drawn will matter.

Order of winning number draws:
The winning prize numbers would go from least to greatest, so the 11th roll would be for who wins the 4 BTC.

Please send 0.05 or more to 1EaG64J9UvEPzcamBAeZeP5AmzP8ieBDxn. Each ticket costs .05, feel free to buy more then 1 ticket per transaction.

Please send ONLY from a wallet you own, winnings will be sent back to the same address that the BTC was sent from!

How do we know we can trust you?
Check my reputation thread in my signature for many examples of me escrowing or purchasing where sent first to 10 BTC or more in one transaction. If you don't trust me, thats fine, everyone is entitled to their opinions. All entries will remain untouched in that address above that I own.

How long do we have to wait for this to fill?
If after 30 days from the first ticket being bought, the drawing has not filled, I will refund all bets. Since this is order sensitive for tickets bought (your order decides the winning number range you get) I will not refund any tickets early for any reason.

Will you be entering this drawing?
In the future I may enter it if people allow it but for the first one to prevent any accusations of being "in" on the drawing, I definitely will not be entering.

When will the drawing occur?
When all 200 tickets are sold, I will announce the specific time and date of the drawing, in which I will be chat under the 99900 account so you could be there when I first announce what ticket # wins each drawing. The drawing will occur within 48 hours of the 200th ticket being purchased.

I have another question?
Feel free to PM me or comment here


List of tickets and their owners:
1. 179QD   2. 1ApYR   3. Harshbuttrue (SWC)   4. 1GdQZ   5-200. LightLord.

Basically Lightlord owns 02.00.00 to 99.99.99. If any of the 11 numbers are below 02.00.00 then someone else wins that amount haha.