In my previous post I talked about that the blockchain never forgets and it is only pseudonym.
So if you gain a lot of money you should also tax it if you don't want to have problems with the revenue authorities.
The possibility is high that they can detect your account especially when you are connected with your Facebook account.
Just sayin :)
Actually I don't think you need to document it until it's used to purchase something. Both the IRS and the Florida judge everyone was posting about last week have declared that bitcoin is now money. It's only a piece of property until it's exchange for something. Don't get me wrong, I'm not a financial expert, but I don't think you need to document your "income". You don't document it when you give a piece of furniture to someone do you?
only if you convert to FIAT, that's why i use my bitcoin debit card.
have a look on my #introduceyourself too
https://steemit.com/introduceyourself/@raphma/hey-steemit-professional-poker-player-and-senior-member-from-bitcointalk-coming-in
Not sure if that really works.