Zcash Co-Founder Eli Ben-Sasson Questions Bitcoin’s 21M Cap, Proposes 4% Annual Growth
Zcash co-founder Eli Ben-Sasson has challenged one of Bitcoin’s most entrenched design principles, questioning the fixed 21 million supply cap in a series of posts on X on July 7, 2026. Ben-Sasson argued that lost private keys will permanently remove coins from circulation over time, and proposed a 4% annual issuance rate as a potential alternative to maintain liquidity.
Lost Keys and the Case for Supply Adjustment
Ben-Sasson’s central concern is that Bitcoin’s fixed cap does not account for coins that become inaccessible due to lost or destroyed private keys. “Capping the supply of Bitcoin at 21M doesn’t make sense. Because over time, keys will be lost. In fact, as time goes to infinity, all keys will be lost,” he wrote. While he reaffirmed support for a clear monetary policy with an absolute upper bound, he suggested that a fixed maximum growth rate—such as 4% annually—could better align with human population growth and ensure sufficient circulating supply.
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The remarks have reopened a long-standing debate within the cryptocurrency community about the trade-offs between absolute scarcity and practical liquidity. Bitcoin’s 21 million cap, embedded in its code by creator Satoshi Nakamoto, is widely regarded as the foundation of its value proposition as a store of wealth. However, Ben-Sasson’s argument shifts the focus from theoretical scarcity to real-world accessibility, noting that coins held in lost wallets effectively reduce the network’s usable supply.
Contrast with the Saylor Thesis
Ben-Sasson’s proposal stands in contrast to the demand-driven thesis often associated with MicroStrategy executive chairman Michael Saylor. Saylor has argued that Bitcoin’s fixed supply, combined with growing institutional adoption, will drive long-term price appreciation. In that model, scarcity is a feature that increases value as demand rises. Ben-Sasson, by contrast, frames lost coins as a future supply constraint that could harm market liquidity and usability.
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The proposal does not call for unlimited Bitcoin creation. Instead, it envisions a rule-based issuance model that caps total supply while allowing for gradual growth. However, any change to Bitcoin’s supply schedule would require broad consensus across the network—including developers, miners, node operators, and holders—making it a highly unlikely scenario in the near term.
As of July 2026, Bitcoin continues to operate under its original 21 million cap. The discussion highlights how foundational design choices remain central to cryptocurrency markets, with traders and analysts weighing the implications of scarcity, lost keys, and liquidity within the same debate.
Frequently Asked Questions
Why did Eli Ben-Sasson question Bitcoin’s 21 million supply cap?
Ben-Sasson argued that as private keys are lost over time, coins become permanently inaccessible, reducing usable supply. He believes a fixed cap without adjustment for lost keys may not be optimal for long-term liquidity.
What did Eli Ben-Sasson propose instead of a fixed 21 million cap?
He suggested a maximum annual issuance rate, using 4% per year as an example, to align supply growth with human population growth and offset coins lost due to forgotten or destroyed private keys.
How does this proposal differ from Michael Saylor’s view on Bitcoin?
Michael Saylor’s thesis focuses on rising institutional demand against a fixed supply to drive value. Ben-Sasson’s proposal emphasizes the problem of lost keys reducing accessible supply, arguing for a flexible issuance model to maintain market liquidity.
Could Bitcoin’s supply cap actually be changed?
Changing Bitcoin’s 21 million cap would require broad consensus among developers, miners, node operators, and holders. Without overwhelming network support, the cap is likely to remain unchanged.
