StarkWare chief executive Eli Ben-Sasson sparked fresh debate over Bitcoin's monetary policy after posting on X that the 21 million supply cap "doesn't make sense." He proposed replacing the fixed limit with a hard issuance rule of up to 4% per year, arguing that lost private keys steadily reduce the usable supply.
Lost private keys fuel the argument
Bitcoin has no password reset. Once a holder loses a private key, the coins remain on-chain but become unspendable. Ledger estimated that 2.3 million to 3.7 million BTC are permanently lost; some reports place the figure near 4 million. Ben-Sasson used this trend to claim a fixed cap could make Bitcoin less useful over very long periods, as more coins become unreachable.
He proposed an annual issuance rate of 4%, roughly matching global population growth, arguing this would still keep Bitcoin scarce under a predictable monetary rule. The proposal directly challenges a core Bitcoin belief — that lost coins effectively act as a "donation" to other holders by reducing circulating supply and increasing scarcity.
Bitcoin community fires back
Critics on X quickly rejected the 4% inflation idea. They stressed that the 21 million limit is one of Bitcoin's defining features, and changing it would make BTC resemble other crypto assets. Some pointed to Bitcoin's divisibility: the network can split a single BTC into 2.1 quadrillion satoshis, providing sufficiently small units for payments even if whole coins become harder to access.
Ben-Sasson countered that those satoshis would also trend toward zero over time if private key losses continue. He maintained Bitcoin could remain scarce if the inflation rate stayed fixed and predictable. The debate echoes comments from Strategy executive chairman Michael Saylor, who spoke about burning private keys as a "pro rata contribution" to other holders, though he did not commit to doing so himself.
Zcash model enters the picture
Zcash founder Bryce "Zooko" Wilcox offered an alternative path. He pointed to Zcash's proposed Network Sustainability Mechanism, which lets users burn ZEC and gradually reissue those coins as future rewards without raising the 21 million cap. Unlike Ben-Sasson's proposal, this model keeps the lifetime supply limit intact while addressing miner incentives through internal recycling.
Any change to Bitcoin's cap would face enormous hurdles. Developers can propose code changes, but node operators, miners, exchanges, wallets, and users must reach broad agreement before the network accepts them. StarkWare had previously worked on bringing scaling tools to Bitcoin without forking Starknet or launching a new Bitcoin token. This new debate shifts from scaling to monetary policy — an area where Bitcoin users have shown almost no appetite for altering the current supply rule.