I won't post the link to the source or his email address, but apparently nanashi___ is selling the Mt. Gox user database:
Official sale of MT.Gox database: personal details for almost all Bitcoin users.
I am selling all data obtained in recently MT. Gox database hack. File is ~20gb and contains full personal information of all clients in gox system, including passport scan. This document will never be elsewhere published by us. Selling it one or two times to make up personal loses from gox closure. Asking 100BTC for entire document. Willing to sell it in pieces, 10BTC for 2gb of data.
I will verify that I am in possesion of this data before you make purchase. Interested buyers can contact me and I will send you all information contained in file about you personally. No one contact asking for parts of the file for free/me to send file before payment.
I hate those blackhats ~.~
EDIT 11.03.2014:new info:
Mt. Gox database sale: steps to remove yourself from dump before sales.
Most around here know we are selling gox customer info. Many have contact us requesting to pay to have their data removed before we sell. We are doing this for a cost of 0.25 BTC per person removed. We have already sold and release 20% of data to 2 buyers, so if you are apart of that it's too late for you.
We are release the rest of this data to our buyers sometime this week, so after that happens it is too late for everyone who has not been removed already.
1) Email [...] with the email you used with mtgox.
2) I will check file already sold, if you are not part of that I will send you unique bitcoin address. If you don't get response it means your data has already been sold in first batch or we have finalized sale of all data.
3) After you have sent .25 bitcoin payment, email us again to inform us of this.
4) Thats all, we will delete your personal data and passport scan from all copies of database.
DO NOT email asking to do this for cheaper unless you are doing 10+ accounts at once. Also do not email us asking to confirm what information we have about you. If gox had it, we have it, and as you can read on boards we have confirmed possession of this dump for many people. We let you use our same email for this as all other gox hack communication so you know we are same people. Doing this things will cause us to ignore all further message from you.
nanashi
Also do not email us asking to confirm what information we have about you.
Interesting how this is the opposite of what he said before.
Afaik nobody has proven to be in possession of such data yet (please correct me if I'm wrong).
I'm starting to think this is all a scam.
EDIT 19.03.2014:04:37 email change to [...]. use pgp from original hack posts to confirm i am same person. cost is 0.35 bitcoins for full perm data delete
04:37 http://[...] use public pgp from there or any original hack posts to confirm its me
04:38 How do I know my data wasn't part of the piece of the file you have already sold?
04:38 if you don't start getting spam/phishing emails yet, you probably not part of the piece sold. email me with address and i check sold file.
04:38 if your data is not part, i send you bitcoin address and perminantly delete your data after payment recieved.
04:38 [...] only, do not use old address.
04:39 use same pgp to confim it me. i delete everything including passport scans and bank info.
04:40 nanashi is your group responsible for the new login on mtgox.com?
04:40 we did not do mtgox.com login. they still control mtgox.com as far as i know
04:40 We're supposed to trust the guy who stole the DB and sold them?
04:40 don't care. just responding. if i wanted to control mtgox.com i probably could.
04:40 Ok so it's safe to login to Mt Gox?
04:41 yes as long as you trust frenchman who stole 951,116 btc. he probably had to put this up for legal reason
04:42 Nothing was stolen by me. Time will tell the full story. On the other hand you are exorting people after stealing our customer's info. You are probably the hacker who stoll all our Bitcoins in the first place.
04:42 bla bla bla bla
04:42 yes I stole one billion dollars and now am sticking around to sell data dump for peanuts
04:42 ps they were not your bitcoins, they your customers
04:43 they're
04:43 two people commit suicide already because of your fraud and you joke. you care?
04:43 How many people will kill themselves because of what you are doing?
04:43 few poeple kill themself because of viagra spam. you ruined many people
04:44 Lots of people kill themselves because of identity theft, which is happening with the data you are selling.
04:44 this is serious? if you are so concerned next time protect customer info better. why you even keep passport scans on server?
04:44 if not for us someone else would have done exact same
04:44 at least we give people honest chance to have data deleted before sale
04:44 nanashi is it too late to have my information removed before you sell the database?
04:45 gonzop maybe not. have sold 10% of dump and am waiting until thur/20 to sell rest while allow people to pay to be removed
04:45 Pure extortion. I can't wait until they catch you.
04:45 can't wait to see you behind bars mark. you rob one million people.
04:45 I didn't rob anyone. You are a criminal.
04:45 maybe but i need sell this data to feed my family. you took food from their mouth like thousand other when you stole our bitcoins
04:46 You are a scumbag.
04:46 what does that make you?
Thoughts? Clearly the bitcointalk nanashi___ isn't the real one, but has anyone tried to contact the real nanashi___? Could he prove possession of Mt. Gox user data?
P.S.: I don't even know whether these chat logs are real or not.