Don't do any deals with luke-jr, especially ones that depend on him living up to his word.
On March 14, 2011, we made history by entering into the first Bitcoin futures contract that I know of. The value at the time was $0.92. He thought that the value would exceed $1.15 in a month's time and I took the other side. A month later, the price closed at $0.86 and his position lost. I came to him to settle up, but he responded with a long-winded obfuscation and refused to pay.
At the time the deal was made, luke-jr specified that if either side failed to live up to the deal, he would be "publically shamed."
The contract was documented in the #bitcoin-dev IRC channel (starting with http://bitcoinstats.com/irc/bitcoin-dev/logs/2011/03/14/1
A contract to buy at a future date (a futures contract) is settled based on the difference between the strike price ($1.15) and the last price before the expiration time (the price at 4/12 23:59:59 which was $0.86 according to bitcoincharts mtgoxUSD).
Since the size of the contract was 25 btc, the value of the deal is therefore:
(25 * $1.15) - (25 * 0.86) = $7.25
In my favor.
I'll quote the main text:
The conversation began with a discussion of bitcoin futures (my nick is blarzong):
00:11 luke-jr blarzong: I will sell him 1 BTC, for a contract to purchase more at a specific rate.
00:12 blarzong luke-jr: what rate?
00:12 luke-jr blarzong: I will pay him 1 BTC, in exchange for an agreement that he will buy 50 BTC from me within the next month at $1.25 USD each
00:12 blarzong luke-jr: that would be a losing proposition
00:13 luke-jr blarzong: if you know the future, it might be
00:13 luke-jr I'm obviously betting that it won't go over $1.25 in the next month
00:14 blarzong luke-jr: the market doesn't expect it to go anywhere near 1.25.. so your proposal wouldn't be favorable to anybody's risk asessment
00:14 luke-jr blarzong: where is that market analysis?
00:15 luke-jr I certainly expect that it will go near $1.25
00:15 luke-jr just not over
00:15 blarzong luke-jr: i will take that bet
00:17 luke-jr blarzong: make it $1.15 and I might bite
00:17 blarzong ok $1.15
00:18 luke-jr blarzong: this is contract to buy, not option, right?
00:19 blarzong yeah
00:19 luke-jr 25 BTC so $28.75
00:19 blarzong ok
00:20 luke-jr blarzong: please deposit to clearcoin and send the link to the email I PM you
00:25 blarzong how can he ensure i will pay up if im the loser
00:25 blarzong or he will pay up if hes the loser
00:26 blarzong in the end, one party will give the other the difference in btc
00:27 blarzong i think someone on the forum said they were developing a market with ricardian contracts you could transact
00:29 molecular are you doing a trade or a bet?
00:29 Necr0s A contract to trade at a later time, yes?
00:29 luke-jr molecular: kindof a bet
00:30 molecular your basically making contract to make a trade @1.15 at a certain point in the future?
00:30 blarzong this is the first btc futures contract
00:38 blarzong luke-jr: until we have ricardian contracts in place it will have to be a gentlemans bet..
01:01 luke-jr blarzong: I assert that I should be trusted on my word.
01:02 blarzong luke-jr: youre a trustworthy guy, so thats fine w/me
01:16 blarzong luke-jr is a smart guy.. i think i will probably lose a few btc on this trade
02:04 luke-jr blarzong: as of right now, we have no contract. While I assert my word as being trustworthy, that does not extend to taking you at your word. :p
02:19 luke-jr Netsniper: why don't we just say max stakes 20 BTC, calculated on the market price in a month?
02:30 luke-jr maybe we need a trusted 3rd party to hold the escrows and evaluate the market
02:44 luke-jr blarzong: why don't I just plan to buy 25 BTC from you at $1.15 on Apr 13, and if one of us fails to follow through we are publicly shamed?
02:45 blarzong luke-jr: fine w/me.. thats exactly what you said before, but im for it
02:45 luke-jr nah, before I was insisting on clearcoin from you :p
02:45 blarzong aye..