Per a discussion on IRC, I am auctioning off my immortal soul to the highest bidder over the next week. (As an atheist I have no use for it, but it has a market value and so holding onto it is a foolish endowment effect.)

The current top bid is 1btc ($120) by John Wittle.

Details:

1. I will provide a cryptograpically-signed receipt in explicit terms agreeing to transfer my soul to the highest bidder, signed with my standard public key. (Note that, as far as I know, this is superior to signing in blood since DNA degrades quickly at room temperature, and a matching blood type would both be hard to verify without another sample of my blood and also only weak evidence since many people would share my blood type.)
2. Payment is preferably in bitcoins, but I will accept Paypal if really needed. (Equivalence will be via the daily MtGox average.) Address: 17twxmShN3p6rsAyYC6UsERfhT5XFs9fUG (existing activity)
3. The auction will close at 4:40 PM EST, 13 June 2013
4. My soul is here defined as my supernatural non-material essence as specified by Judeo-Christian philosophers, and not my computational pattern (over which I continue to claim copyright); transfer does not cover any souls of gwerns in alternate branches of the multiverses inasmuch as they have not consented.
5. There is no reserve price. This is a normal English auction with time limit.
6. I certify that my soul is intact and has not been employed in any dark rituals such as manufacturing horcruxes; I am also a member in good standing of the Catholic Church, having received confirmation etc. Note that my soul is almost certainly damned inasmuch as I am an apostate and/or an atheist, which I understand to be mortal sins.
7. I further certify that the transferred soul is mine, has never been anyone else's, has not been involved in any past transactions, sales, purchases, etc. However, note that, despite rich documentation that this is doable, I cannot certify that any supernatural or earthly authorities will respect my attempt to sell my soul or even that I have a soul. It may be better for you to think of this as purchasing a quitclaim to my soul.
8. Bids can be communicated as replies to this comments, emails to gwern@gwern.net, comments on IRC, or replies on Google+. I will update this comment with the current top bid if/when a new top bid is received.

Suggested uses for my soul include:

• novelty value

• pickup lines & icebreakers; eg. Wittle to another person considering selling their soul:

  JohnWittle> ______: "You know, I own gwern's soul.
  You know, gwern of LessWrong and gwern.net" is a
  great ice breaker at rationalist meetups and I anticipate
  it increasing my chances of getting laid by a nonzero amount.
  Can your soul give me similar results?
  

• supererogatory ethics: purchasing a soul to redeem it
• making extra horcruxes

• as a speculative play on my future earnings or labor in case I reconvert to any religion with the concept of souls and wish to repurchase my soul at any cost. This would constitute a long position with almost unlimited upside and is a unique investment opportunity.

  (Please note that I hold an informational advantage over most/all would-be investors and so souls likely constitute a lemon market.)

• hedging against Pascal's Wager:

  presumably Satan will accept my soul instead of yours since damnation does not seem to confer property rights inasmuch as the offspring of dictators continue to enjoy their ill-gotten gains and are not evicted by his agents; similarly, one can expect him to honor his bargain with you since, as an immortal he has an infinite horizon of deals he jeopardizes if he welshes on your deal.

  Note that if he won't agree to a full 1:1 swap, you still benefit infinitely by bargaining him down to an agreement like torturing you every day via a process that converges on an indefinitely large but finite total sum of torture while still daily torturing you & fulfilling the requirements of being in Hell.

EDIT: Congratulations to Mr. Wittle.