6

During this CCC conference from 2011, starting from 00:18:55, the presenter suggests that as bitcoins can be lost (lost private key, dead owner, sending to an "eater" address that nobody posses, etc.), and as the total amount of bitcoins has a known threshold (21 millions), there is a possibility that given enough time, most bitcoins, if not all, will actually vanish (be unusable).

The questions is when?

Actually, according to him:

  • if 0.5% of bitcoins are getting lost per year, "all" bitcoins will be gone by approx. 2032;
  • if the losing rate is 0.1% per year, it will probably last for a century, but will ultimately be doomed.

And if we suppose that inactive wallets (2 years with no transaction) are in fact lost wallets, we reach that 0.1%/year threshold...

6

The math is clearly absurdly unrealistic because as there are fewer Bitcoins available, it becomes harder to lose them. So the rate of loss has to decay as the availability of Bitcoins goes down.

  • 1
    Although the quantity lost per iteration will fall, as the total supply decreases the RATE of loss be it half a percent, one percent, etc. per year would not change, as the circumstances leading to loss would be unchanged; death, drive failure, natural disaster, etc. The rate of loss will always be n^T where n is less than one; ie 0.99 and T is time. It would seem to me that it is you that fails to understand logarithmic decay; half-life. – litepresence Jan 3 '17 at 21:20
4

Are you suggesting that 0.5% relative to the still available bitcoins are lost every year or 0.5% of the absolute amount of bitcoins? Anyway, either my math is lying or each would turn out to be about 10% loss in 20 years, which doesn't translate to "all" in my opinion.

Additionally, should the value of Bitcoin sufficiently increase (which would happen if as many Bitcoins were lost as you suggest), the protocol could be hard-forked to allow for another eight digits divisibility. While the distribution would remain the same, a fraction of a bitcoin would then still be enough to fuel a global economy.

Finally, since this question was first asked, wallets with deterministic key derivation have become more commonplace. As it is sufficient to transfer the master seed for such wallets, it is almost trivial to bequeath such wallets.

  • Excelent analysis! A loss of 0.5% of each year's existing money supply means that, over 20 years we get 1.005^20 = 1.1049 i.e. 10.49% If it's rather 0.5% of all possible Bitcoins (that is, off the max. possible 21 million) then in 20 years we get exactly 10% . Per your 2nd definition, bitcoins would evaporate in 200 years, as per the first, in ln(2)/ln(1.005) = 138.9757 years :) – Joe Pineda Dec 30 '13 at 18:54
  • 1
    Thanks! However, in the relative loss scenario, the loss should be 1 - 0.995^20 = 9.54%. Otherwise one would calculate a 0.5%/a growth, not a 0.5%/a loss. – Murch Jan 3 '14 at 2:31
1

There is currently a bounty offered on BitcoinTalk for implementing a method that would add bitcoins back to the mining reward in the case that an address had no activity for over 50 years which would completely resolve this concern.

The post can be found here and is located at #3 on the list https://bitcointalk.org/index.php?topic=371601.0

0

The math associated with this question is simply wrong! Conceptually, it is very simple to apply the rule of 72 in reverse. By applying the rule of 72, known by most bankers, knowledgeable investors, and knowledgeable consumers of loans, it indicates half of all Bitcoins will disappear after 144 years, assuming 0.5% are lost each year. (No PHD in mathematics is required, very simple math: 144 = 72/0.5)

-2

In theory, yes, they will all disappear eventually. However, as the money supply decreases due to their being less Bitcoin in circulation, the price will increase due to the scarcity of the existing coins so it will become more and mor expensive to misplace your bitcoins :)

  • -1 Not useful to me: Repeats information from the previous answers and doesn't add any new insights. – Murch Jan 3 '17 at 11:01
-2

Every year 1% of people die.

If every year 1% of bitcoin is lost, every 70 years:

HALF the coins in circulation remain.

if all coins were accounted for and all were already mined:

2086 0.99^70  = 50% remain
2156 0.99^140 = 25% remain
2226 0.99^210 = 12.5% remain 
2296 0.99^280 = 6.25% remain

enter image description here

  • 1
    -1 This calculation makes weird assumptions because it seems extremely unlikely that 1% of the population dying that translates to 1% of the Bitcoin users dying. Also, 1% of the Bitcoin users dying doesn't necessarily translate to 1% of the Bitcoins lost. Thus, I'm not sure what we're supposed to learn from this answer. – Murch Jan 3 '17 at 11:00
  • so you're proposing that even though 1% of all people die every year... bitcoin holders have found the fountain of youth and therefore 1% of bitcoin holders don't die like normal people? – litepresence Jan 3 '17 at 20:45
  • Further, besides death and failure to will; there is house fire and paper wallets, and coins lost on hard drives that fail every 10 years unlike humans which tend to make it 70+ years, then there are coins lost because sent to invalid addy, and myriad of other failures. I suspect 1% annual loss of supply is conservative. i.imgur.com/6C238Pp.png – litepresence Jan 3 '17 at 21:00
  • No, I merely suggest that since Bitcoin is a young technology, it is adopted first mostly by 20-40 year olds, and that those age groups have a smaller portion of the dying population for decades to come. Also it seems rather absurd that with gaining importance and value people would continue to lose Bitcoin at the same rate, especially since backups of deterministic wallets (that have become more common since this question was asked) don't outdate and are thus are perfectly inheritable. – Murch Jan 3 '17 at 21:57

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