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 Do you think that as time and technology progress it will be possible to "mine" those lost bitcoin from old wallets? In the future when sha256 collisions are easy or something like that? 
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 Quantum computers do not exist yet. Only theoretically possible.  
 The note was talking about the future. What do you think? Would it be possible in 5, 10, 20 years? 
 In 20 years maybe. Does it matter if you can sell your BTC by then? 
 How can anyone know for sure which bitcoins are lost? 
 I think it would be safe to say, that when the technology is far enough that we would be able to systematically "mine" old addresses all non migrated bitcoin will be in the lost category and free for anyone to "mine" again .  
 I wonder if that can be verified  
 What do you mean? Verified mathematically if the old wallet mining would be event possible?  
 I also asked on #StackerNews and got into a new rabbit hole 

https://stacker.news/items/583764/r/alashazam

there are 'burned coins' and lost wallets but the lost bitcoins are mostly the first category (the second type are still valid and we may assume that someday someone will access the lost wallet)

Hope it make sense

(I am still very new to that stuff, and get easily confused) 
 The amount of unclaimed rewards (burned coins?) should be verifiable on the chain, right? The rest exist the same way as a Roman gold coin exists few meters deep in a potato field somewhere in the middle of nowhere... It can be recovered tomorrow, in 25 years, in 250 years or never.  
 Since it all started back in January 2009, many people must have had mined many and changed computers, forgetting they mined btc while they were 1$ or so, non-technical people might have lost their password, other had their storage destroyed, lost, that was my guess, but I wanted to have more stories ...  
 sorry if what I am saying makes no sense, I am still trying to understand all this new stuff