[sethist]

I also wonder what percentage of the "hoarded currency" is actually currency that has been destroyed and if it will have any long term consequences. For example, in the early days of Bitcoin I mined a few blocks with an old laptop. The computer eventually died without any backup of my wallet thereby destroying the those Bitcoins. There doesn't appear to be anyway for anyone to know whether I am simply hoarding those Bitcoins to dump on the market at a later date or if they have been permanently removed from the money supply.

[vyrotek]

I'm in the same boat. I played around with BitCoin in the early days and never really cared for the coins I earned. I wiped the machine I used and only recently realized they were gone forever. Apparently I just flushed a few hundred bucks, meh.

[gwern]

> There doesn't appear to be anyway for anyone to know whether I am simply hoarding those Bitcoins to dump on the market at a later date or if they have been permanently removed from the money supply.

Yeah, this is the big problem with the papers or blog posts pointing out how many coins are not moving around and then insinuating that Bitcoin is a scam or that it will soon be destroyed as an old miner dumps a few hundred thousand coins: for most of them, the parsimonious explanation for them not moving is simply that they've been lost. But there's no way to prove this! Did Satoshi wipe his hard drive when he moved on to other 'projects'? We have no way of knowing.

(There apparently are ways to verifiably destroy bitcoins - send them to impossible addresses or something like that - but I haven't heard that anyone has bothered doing that and this wouldn't apply to people losing coins accidentally or apathetically.)

[new299]

If a few blocks is 3 or 4, you might want to keep that HD around. Could be worth sending it to a professional data recovery firm and having the platters removed etc.