Brain Wallet Challenges - Guessable Passphrase Bitcoin Bounty

[wrayjustin]

Brain Wallet Challenges - Challenges provide a Bitcoin Bounty held in a Wallet secured by a Guessable Passphrase.

Description:

Challenges provide a Bitcoin Bounty held in a Wallet secured by a Guessable Passphrase. Each challenge has a set category and a set number of hints. Hints must be purchased, but a portion of all hint fees are added to the Bounty!

Links:

Brain Wallet Challenge (www.reddit.com/r/brainwalletchallenge)
Welcome Post
Challenge #1:  Movie Quote

Frequently Asked Questions:

• What's a Brain Wallet? - A brainwallet refers to the concept of storing Bitcoins in one's own mind by memorization of a passphrase.
• Is there a site I can use to generate the Brain Wallets? - Absolutely, check out brainwallet.org
• When are new challenges posted? - After the current challenge is beaten. All new challenges will be flared as such.
• How much does a Hint cost? - The formula is (Total Bounty / Total Hints) * 1.5
• How much of the hint price is added to the Bounty? - 15% goes into the bounty of the current challenge.
• What happens to the rest? - 85% goes towards recouping funds for the next challenge, as well as operational costs.
• How do the hints work? - Each challenge has a set number of hints. The hints get much more specific as you purchase more. Buying all the hints or even most of them essentially gives you the answer. However, be resourceful and you will solve the challenge far before then. Remember that a portion of every hint payment goes towards the bounty. More players equals a higher bounty!
• What is a Salt and how do I use it? - The salt is a random, 10-character string added to the beginning of the challenge passphrase. This will be given to you in the initial post.

Getting Started:

You'll need a Reddit account (as the games are hosted on Reddit) and a ChangeTip account (more information on changetip can be found on their subreddit /r/changetip or their website www.changetip.com).  Subscribe to the /r/brainwalletchallenge subreddit to stay informed of new challenges.  Purchased hints will be sent to you via a private message on Reddit.

Example Profit Chart (Challenge #1):

The following is the profit table, the column title indicates the number of assumed players; as more contestants buy hints, the profits will increase.  Remember 0.001125 BTC is being added to the bounty for each hint purchased.

Hint	1 Player	2 Players	3 Players	4 Players	5 Players
1	0.093625	0.09475	0.095875	0.097	0.098125
2	0.08725	0.0895	0.09175	0.094	0.09625
3	0.080875	0.08425	0.087625	0.091	0.094375
4	0.0745	0.079	0.0835	0.088	0.0925
5	0.068125	0.07375	0.079375	0.085	0.090625
6	0.06175	0.0685	0.07525	0.082	0.08875
7	0.055375	0.06325	0.071125	0.079	0.086875
8	0.049	0.058	0.067	0.076	0.085
9	0.042625	0.05275	0.062875	0.073	0.083125
10	0.03625	0.0475	0.05875	0.07	0.08125
11	0.029875	0.04225	0.054625	0.067	0.079375
12	0.0235	0.037	0.0505	0.064	0.0775
13	0.017125	0.03175	0.046375	0.061	0.075625
14	0.01075	0.0265	0.04225	0.058	0.07375
15	0.004375	0.02125	0.038125	0.055	0.071875
16	-0.002	0.016	0.034	0.052	0.07
17	-0.008375	0.01075	0.029875	0.049	0.068125
18	-0.01475	0.0055	0.02575	0.046	0.06625
19	-0.021125	0.00025	0.021625	0.043	0.064375
20	-0.0275	-0.005	0.0175	0.04	0.0625

[1714809831]

1714809831

[1714809831]

1714809831

[Nobitcoin]

Good idea shame I didn't think of it myself 

[Jaaawsh]

This is cool :3 but you should give out one free hint to everyone. Just make it a really shitty hint that COULD point us in the right direction.

[wrayjustin]

Good idea shame I didn't think of it myself 

Thanks!  Hope to see you in there.

This is cool :3 but you should give out one free hint to everyone. Just make it a really shitty hint that COULD point us in the right direction.

We're actually discussing this now.  Here's what I said to another player:

Just keep in mind that brute-forcing is an option and we need to ensure we don't provide enough information that would allow someone to simply brute-force the challenge for free.

As it stands right now the search-space is massive, any line or collection of lines from any Movie ever. But once we get more specific, that search-space shrinks dramatically and brute-forcing is a real and fair possibility.

Additionally, One thing we are likely to do is post a second challenge tonight, which has a smaller bounty, and therefore, smaller hint prices. This will hopefully let people try the game out, with a much smaller investment.