One cannot distinguish between saved and lost coins, because it is only possible to prove ownership of a private key, but impossible to prove that a private key is lost. I.e. nobody can tell the difference between whether I just haven't moved my coins for five years or I lost the key.
However I just did some quick net search, from redit through stackexchange and ending with random people blogs and pretty accurate picture emerges, about 25% of bitcoins has been lost forever. 4.000.000! if you add Satoshis stash  
Some talented programmer could write a script which would be looking for wallets "inactive" for 4-5 years, with equal(like 50BTC or 75) amount of bitcoins (possibly from early mining), that could give us some more precise knowledge.

No more classic numerals on buildings, streets, government(city) documents etc.
They still will be in use, cause who is going to stop regular people from using them?
New puzzle ready-> GL and stay tuned.

Another "ancient" puzzle is ready 4 you to crack. Doge is on the rise again hold maybe?
Solve and claim, dont forget to let me know that you did, some points awaits.

I will try with one more idea. Simple and iconic. Somehow similar to untolds work, not intended.
Two more days in the competition left, I bet the best logos are yet to be posted

Virtually any colour could be applied, only one layer in any resolution with transparent background.
I think it will be my last approach for this contest. 

Prize of 350Doge was released, congrats VanDerWaals.
New period starts immediately, scoreboard was reset and saved.
Solve the math riddle below, claim and post, 4points and an item awaiting.
   

I'm having trouble with logging in to betcoin account.
IP verification system is not sending me any emails   and I hate that.
The same happens with password reset method.
What should I do besides placing a ticket? (I did file a ticket now but not sure if system recognizes my email)
This happens to me second time, before it was just temporary, last month it was all OK, now second day in a row and no massages.

Edit: Case closed, handled and resolved by betcoin support.

Last puzzle for this period ready down below. Winner is obvious, congratulations But you know that this is not over yet, just a beginning. New period starts tomorrow, prize will be issued in PM soon after first riddle for period2ofRound4. Thanks for playing and as always stay tuned.
   

New leader arose, impressive scores Mr Van first place challenge? Looks like it.
One more puzzle in current period left, not much can be changed, however... what good is of magic when unused? GL and as always stay tuned.

Every first letter after the dot clever, good job VanDerWaals.
I was trying similar method but did not figured out it was about every first letter...
Additional yobicode with 300 Doge was sent in PM. 5 extra points in the tournament added as well.   

Miiikes riddle from this post is still unsolved, although I'm still trying a little few more minutes and it will be boosted with 300 additional DOGE as Saturday is about to end in my time zone. Real brain breakers today stay tuned for more "free" coins and (truly)free fun Last but not least -> new simple puzzle is ready.

Around 500 plus 5points for the scoreboard however I'm bumping this reward with additional 100Doge per day it is hanging unsolved so it is +200 by now. Quite a nice and chunky yobicode, if you ask me...
Next puzzle nr2 for today is ready.

Hard puzzle, I think its even harder than previous one, I dont have a clue on how to approach it
Right now we have two unsolved puzzles here, Miiikes and mine below. Two more will come at later hours today. If Miiikes riddle gets solved and proven correctly, I'm offering a bounty points for it, additional 5P.
Meanwhile take a look at something easier -> 

Hello, another math puzzle is here. Shouldn't be hard to solve.
I think I will be AFK tomorrow so multiple puzzles that are in schedule for Saturdays could get posted in uneven time spans, maybe even 3puzzles in a row? But that's unlikely.  Stay tuned.
   

Slightly bit different puzzle once again. Not to hard though.
Solve it, claim it and let us know, points awaiting.
   

No problem, massage verified and quoted.

---

Obviously verified with coinig... yes its has its flaws but calling people stupid for using it... c'mon
as long as it works for certain signatures, it is absolutely OK to use it, cause why not?

Hi. Yes this is correct. Cool that everything works for you
Multibit classic is not asking for any passwords at start-up.
Your passcode will come in handy while doing some operations with the wallet, sending BTC or signing personal massage etc.
Safety reasons dictate to import "empty" private keys in to BCH wallet.
So make sure you have bitcoins stored in a different wallet while working on retrieving BCH.

Well that depends, I have had a few situations where campaign manager told me that he would love to have me at his campaign, that for past few days all he gets are submissions from "illiterate" people and if this rate continues he will be out of work. Basically, amount of good posters is limited, new ones are disqualified because of fresh accounts, older members are usually wearing some signature etc. They(managers) sometimes have no choice.

At first glance I thought you will be referring to crappy threads
Those about shoe size, favourite movie or amount of inches nature gave you   are the best/worst.
I have been wondering why those are permitted, rules clearly say, no crappy subjects...
Anyway, welcome at the forums, have fun and stay safe.

Just my one cent to the pile:
Maybe it is time to drastically change the distribution model? Just like most other altcoin airdrops, go with registration and 1click for everyone to receive fixed amount every 24h or so.
No more farming, no more abusing, bots and "illegal" pools.
It works for others than why not for Raiblocks? Yes, its super ordinary, in fact one may say its boring but you can see for yourself where competitive model drove all of us...
Either way, good luck and try to make Rai interesting and fair one more time pretty please  

Everybody everywhere are reducing rewards and payouts due to bitcoins price spikes...
Very often they are egger to reduce but somewhat forget to increase at lows...
Thanks to "stable" doge price you wont see this any time soon at my thread Solve&claim ->
   

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My browser is Firefox55xx 32bit, if it gives you any clues.