What happens when Bitcoin’s lost coins keep increasing?

[Antidote47k]

A few days back I came across a post here about protecting your Bitcoin while still making it available for your family in the event of your death, and it got me wondering about all the UTXOs that have been lost since the genesis of Bitcoin.

If the private key to a UTXO is lost, the UTXO remains on the blockchain forever and is effectively unspendable. Given Bitcoin’s fixed supply of 21 million coins, could lost coins eventually make the available supply much smaller? While I don’t necessarily see this as a serious issue, it makes me wonder if we could eventually reach a point where a very significant portion of Bitcoin is permanently inaccessible.

Is there any way these coins could ever return to circulation? But then the bigger question is, how would we even identify a lost UTXO? Bitcoin has no mechanism for reclaiming coins simply because they have not moved for a long time.

I don’t see this as a problem for the foreseeable future, but it is an interesting long-term question

[Moreno233]

If the private key to a UTXO is lost, the UTXO remains on the blockchain forever and is effectively unspendable. Given Bitcoin’s fixed supply of 21 million coins, could lost coins eventually make the available supply much smaller? While I don’t necessarily see this as a serious issue, it makes me wonder if we could eventually reach a point where a very significant portion of Bitcoin is permanently inaccessible.

Lost coins are lost and will make the circulating supply smaller since they are unspendable. If the number of lost coins increases, which will definitely happen, it simply means that the coins in your wallet becomes stronger and more valuable. In other words, lost coins increases the value of the coins in your possession so it is important to protect the coins in our possession so we don't turn them into lost coins by misplacing the private keys because if you lose your coin, it will be adding value to those of others who still have theirs.

[Stalker22]

While I don’t necessarily see this as a serious issue, it makes me wonder if we could eventually reach a point where a very significant portion of Bitcoin is permanently inaccessible.

I am not sure how you define "a very significant portion," but even if we reach that point, would that be a problem?  What if Satoshi had decided instead of 21 million that bitcoin was capped at, say, 10 million.  Would that have made any difference?

Is there any way these coins could ever return to circulation? But then the bigger question is, how would we even identify a lost UTXO? Bitcoin has no mechanism for reclaiming coins simply because they have not moved for a long time.

Exactly, we cannot know if bitcoins are truly lost or just dormant wallets.  There is no such mechanism, and hopefully, there never will be.

[Livingleged]

A few days back I came across a post here about protecting your Bitcoin while still making it available for your family in the event of your death, and it got me wondering about all the UTXOs that have been lost since the genesis of Bitcoin.

If the private key to a UTXO is lost, the UTXO remains on the blockchain forever and is effectively unspendable. Given Bitcoin’s fixed supply of 21 million coins, could lost coins eventually make the available supply much smaller? While I don’t necessarily see this as a serious issue, it makes me wonder if we could eventually reach a point where a very significant portion of Bitcoin is permanently inaccessible.

For every coin that is lost it’s practically adding more worth of value to the available active once that’s according satoshi himself. He said it will be just like a donation to everyone. It will strengthen the monetary properties for those that remain careful with custody.

Is there any way these coins could ever return to circulation? But then the bigger question is, how would we even identify a lost UTXO? Bitcoin has no mechanism for reclaiming coins simply because they have not moved for a long time.

No, the only way a coin can be recovered is if you can unlock it that is either recovering the seed or it private key. Without any of those then the coin are gone forever.
UTXO are just unspent transactions that are locked on the network by a particular locking script, it’s not like they are even lost. they are on the network but nobody could claim them as you could only sign the transaction if you have the private key that was used to create the signature.

[ColdLava40]

I don’t see this as a problem for the foreseeable future, but it is an interesting long-term question

Less supply=scarcity=high demand. Every lost coins only makes the circulating coins valuable.

But you made a very good point. How do we define lost coins from dormant coins? This question has been on my mind for a very long time. We can't just point every wallet that has not been touched for years as lost coins, so how then are we sure which ones actually accounts for the Increase in values?

What if one day a large potion of said lost coins wakes up and are moved to exchange? Would that mean its effect on the available coins would decrease?

[Coyster]

If the private key to a UTXO is lost, the UTXO remains on the blockchain forever and is effectively unspendable.

I am not sure you fully understand what UTXO's are, but anyway, UTXO's do not have private keys. It is bitcoin addresses that have private keys. Unspent Transaction Output (UTXO) is simply bitcoin you have received in your wallet that you are yet to spend, and whenever you decide to spend some or all of it, it becomes the input in the new transaction.

Is there any way these coins could ever return to circulation? But then the bigger question is, how would we even identify a lost UTXO?

No, coins that are lost are lost for good.
No, there is no way to identify lost coins. There are coins sitting in wallets that haven't moved for a very long time, and some people might think the owners have lost the keys, meanwhile, they are just solid long term hodlers.

A few days back I came across a post here about protecting your Bitcoin while still making it available for your family in the event of your Given Bitcoin’s fixed supply of 21 million coins, could lost coins eventually make the available supply much smaller?

Yes. Bitcoin has a fixed supply, so lost coins reduces that number and makes everyone else's coins worth a little more.

Lost coins only make everyone else's coins worth slightly more.  Think of it as a donation to everyone.

[Hypnotizer]

A few days back I came across a post here about protecting your Bitcoin while still making it available for your family in the event of your death, and it got me wondering about all the UTXOs that have been lost since the genesis of Bitcoin.

…and yesterday I also came across a new thread with the same base question as yours in the Bitcoin Discussion board.

As many people have already mentioned, Lost Bitcoins are for the good of the community because it’s increasing the scarcity of the overall supply, some people even purposely burn their own coins just to give back to the community.

If the private key to a UTXO is lost, the UTXO remains on the blockchain forever and is effectively unspendable. Given Bitcoin’s fixed supply of 21 million coins, could lost coins eventually make the available supply much smaller? While I don’t necessarily see this as a serious issue, it makes me wonder if we could eventually reach a point where a very significant portion of Bitcoin is permanently inaccessible.

@Coyster has already corrected you about what UTXOs mean and why they don’t have any private key. With increasing number of lost bitcoin, the supply would reduce for sure and even if we reached a point where a big portion isn’t accessible, so far people still want to use bitcoin… the price would increase very significantly because of the lesser supply and high demand.
And if your concern is Bitcoin accessibility by a common man, they the smaller units (SATS) got you covered..

[Agbamoni]

could lost coins eventually make the available supply much smaller?

Haven't you heard of cases where individuals found their lost wallet keys and accessed their lost coins, eventually becoming millionaires? That's what happens to most coins that you see adamant in some wallet. The coins are not completely lost, it just remain there until the owner eventually sees them, or it keeps remaining in the wallet. The coins dont expire, it doesnt get accessed by God knows who . What happens to lost Bitcoins is that it stays in the wallet. Perhaps you should ask yourself what happens to the wallet holding Satoshi's Bitcoin when most Bitcoiners dont believe Satoshi is still alive.

[Audrey Simmons]

Let's differentiate two things:-

Maximum Bitcoin Supply: Total number of Bitcoin to exist, capped at 21 millions coins.

Circulating Bitcoin Supply: Total amount of mined Bitcoin, including permanently lost coins which we cannot be differentiated and coins held by long term investors that hasn't been moved for long.

Identifying a lost Bitcoin is way hard to do, except when coins are publicly burned to address impossible to gain access ever again.