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Zcash co-founder Eli Ben-Sasson publicly questioned Bitcoin's fixed 21 million supply cap on X, arguing that the steady loss of private keys will eventually pull circulating supply toward zero. He stopped short of calling for an open-ended monetary policy and said he still backs a hard ceiling, but floated replacing the fixed total with a fixed maximum issuance rate of 4% per year.
Why it matters
The proposal lands in a debate Bitcoin's community has long treated as settled. Every four years the halving steps new issuance down toward zero on a schedule that, on paper, caps the supply at 21 million BTC. Lost keys, dormant wallets, and unrecoverable early-miner hoards already act as a slow, irreversible supply leak the protocol does not offset. Ben-Sasson's framing is that the leak is not a quirk to be tolerated but a structural flaw to be designed around, with growth-tied issuance as a hedge. The pitch is unlikely to gain traction among Bitcoin purists, but it matters because it comes from a credible zero-knowledge and privacy-coin builder rather than a partisan critic.
Market impact
The immediate market reaction was muted. Bitcoin's supply schedule is governed by consensus rules, not commentary, and any change would require overwhelming miner, node, and holder agreement. The signal investors should read is rhetorical rather than mechanical: the existence of credible voices willing to publicly entertain a post-cap monetary regime is, by itself, a reminder that "21 million" is a community commitment, not a physical constant. Watch the response from long-term holders and from institutional ETF allocators, both of whom have bet explicit capital on the existing scarcity story.
Frequently asked questions
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What did Eli Ben-Sasson actually propose for Bitcoin?
He suggested keeping an absolute supply cap but replacing the fixed 21 million total with a fixed maximum issuance rate of around 4% per year, so circulating supply could grow alongside the human population as old keys are permanently lost.
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Could this proposal actually change Bitcoin's supply schedule?
Not through commentary alone. Bitcoin's issuance is governed by consensus rules, so any change would need overwhelming agreement across miners, node operators, and holders. That bar has never been cleared for a monetary-rule change, and most long-term holders treat 21 million as a hard commitment.
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Why does lost-key supply matter for the cap?
Bitcoins in wallets with permanently lost private keys are functionally out of circulation, and that pool grows every year. The argument is that over decades the float could shrink enough to impair liquidity, which is the wedge Ben-Sasson uses to justify a growth-tied issuance rule.
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How did the market react to the proposal?
The immediate reaction was muted. Price action was unaffected, and the proposal drew pushback from Bitcoin purists on the basis that any post-cap issuance breaks the scarcity story that institutional and long-term allocators are buying.
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Why is Ben-Sasson's voice notable here?
He is a co-founder of Zcash and a long-standing figure in zero-knowledge cryptography, which gives his monetary-policy critique more weight than a typical outsider take. Even an idea that is unlikely to be adopted can shift the boundaries of the debate when it comes from a credible builder.
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