A new debate has started in the Bitcoin community after StarkWare CEO Eli Ben-Sasson questioned whether Bitcoin’s famous 21 million coin limit should remain unchanged.
In a post on X, Ben-Sasson argued that Bitcoin’s fixed supply may not make sense in the long run because people continue to lose access to their private keys. When that happens, the Bitcoin is still visible on the blockchain, but it can never be spent again.
According to estimates, between 2.3 million and 3.7 million BTC have already been permanently lost, while some reports suggest the number could be closer to 4 million. Ben-Sasson believes this shrinking usable supply could become a bigger issue over time.
To address the problem, he suggested replacing Bitcoin’s fixed supply cap with a predictable issuance model that would allow up to 4% new Bitcoin to be created each year. He said this rate is roughly in line with global population growth and would still keep Bitcoin scarce while preventing the usable supply from continuously shrinking.
However, the idea was quickly rejected by many Bitcoin supporters.
For most Bitcoin holders, the 21 million coin limit is one of the asset’s most important features. They argue that lost coins are not a flaw but part of Bitcoin’s scarcity. In their view, when coins are lost forever, the remaining Bitcoin becomes more valuable because there is less available supply.
Critics also pointed out that Bitcoin can be divided into very small units called satoshis. Since one Bitcoin equals 100 million satoshis, the network can support transactions even if whole Bitcoins become increasingly scarce.
Ben-Sasson disagreed, saying that satoshis linked to lost private keys would also become inaccessible over time. He maintained that Bitcoin could remain scarce even with a small, fixed inflation rate.
The discussion also brought attention to comments previously made by Strategy Executive Chairman Michael Saylor. Saylor has described the loss or burning of Bitcoin private keys as a benefit to other holders because it effectively reduces the available supply.
Meanwhile, Zcash founder Bryce “Zooko” Wilcox suggested a different solution. He pointed to Zcash’s proposed Network Sustainability Mechanism, which would allow users to voluntarily burn ZEC tokens and have those coins gradually reissued as future rewards. This approach aims to support network incentives without increasing the total supply beyond its existing cap.
Unlike Ben-Sasson’s proposal, the Zcash model keeps the maximum supply limit unchanged.
Even so, any attempt to change Bitcoin’s 21 million coin cap would face enormous resistance. Such a change would require broad support from developers, miners, node operators, exchanges, wallet providers, and the wider Bitcoin community.
For now, most Bitcoin supporters appear firmly committed to keeping the current supply rule intact. While discussions about scaling and network improvements continue, changes to Bitcoin’s monetary policy remain one of the most controversial topics in the crypto world.
