i have one question..
in 2011 bitcoins per 50,000 to 500,000 we spent for nothing, just pranking and stuff...
if one person kept 50,000 bitcoins in his account from 2011 up till now,
would the bitcoins still be valid for transactions?
I do not think that bitcoin has expiration of usage because bitcoin now and then are the same aside from the price that change over the years. Bitcoin then can be use for transactions even for how many years of keeping it to the wallet for its profit. It is not other coin that might use it's value when no more investors interested and no other company that uses that coin for exchange.