StarkWare CEO Eli Ben-Sasson has reignited the long-simmering debate over Bitcoin’s fixed supply, arguing in a recent X post that the 21 million coin cap “doesn’t make sense” because lost private keys gradually remove bitcoins from circulation. He proposed replacing the cap with a hard issuance rule of up to 4% per year, which he says roughly matches global population growth while still keeping Bitcoin scarce under a known monetary policy.
Ben-Sasson’s argument hinges on the fact that lost keys are irreversible—coins remain on-chain but become unspendable. Estimates suggest between 2.3 million and 4 million BTC are already permanently lost. Over an infinite timeframe, he contends, all coins would eventually become inaccessible, rendering the fixed cap meaningless. He believes a predictable small inflation rate could sustain usability without undermining scarcity.
The proposal met swift pushback from the Bitcoin community. Critics insisted the 21M limit is central to BTC’s value proposition, and any change would dilute the asset’s differentiation from other cryptocurrencies. Many Bitcoiners view lost coins as a “donation” that increases scarcity for remaining holders. Supporters also noted Bitcoin’s divisibility into 2.1 quadrillion satoshis, making minute units always available for transactions.
Adding a new dimension, Zcash founder Bryce “Zooko” Wilcox highlighted Zcash’s proposed Network Sustainability Mechanism, which would let users burn ZEC and gradually reissue those same coins as future rewards—preserving the absolute supply cap. This alternative differs from Ben-Sasson’s idea by not creating any additional lifetime coins.
The discussion revived remarks from Strategy executive chairman Michael Saylor, who previously framed burning private keys as a “pro rata contribution” to other holders, though he did not commit to doing so himself. Any shift in Bitcoin’s monetary policy would require overwhelming consensus across developers, node operators, miners, exchanges, and users—making practical change extremely unlikely. StarkWare has previously focused on scaling tools for Bitcoin without forking or new tokens, but this marks a shift into the sensitive terrain of monetary policy.
