On July 7, Eli Ben-Sasson, CEO and co-founder of StarkWare, lit up the crypto conversation with a single idea: scrap Bitcoin's hard 21 million coin cap and replace it with a 4% annual issuance rate.
His argument starts with lost keys. Of the 21M BTC hard limit, 20.05 million have already been mined. Ledger and River Financial estimate 3 to 4 million coins are permanently gone — owners died, wallets were destroyed, keys forgotten. "As time goes to infinity, all keys will be lost," Ben-Sasson wrote on X. If that holds, the 21M figure eventually becomes a number detached from reality: coins exist on the ledger but nobody can spend them.
The proposed 4% rate tracks global population growth, which Ben-Sasson argues would keep the working supply roughly stable. It also addresses a separate problem: after 2140, when block subsidies fully expire, the network must survive on transaction fees alone — and nobody knows if fees will be enough to fund the security that keeps Bitcoin trustworthy.
Pushback was swift and sharp. For Bitcoin maximalists, the 21M cap is a social contract, not a setting you adjust. Critics noted that lost coins actually tighten supply without adding selling pressure — inaccessible BTC can't hit the market. And Bitcoin's divisibility into 100 million satoshis per coin means there's no practical scarcity of units for transactions regardless.
Zcash founder Zooko Wilcox proposed a middle ground: a mechanism to burn coins and allow reissuance after four years, leaving the total cap intact. Ben-Sasson prefers capping the rate of issuance rather than the absolute ceiling.
The odds of Bitcoin actually rewriting its supply rules are close to zero — any change requires alignment across developers, miners, and node operators who have historically resisted even minor protocol updates. But the debate surfaces a real question that doesn't expire: what funds network security once the subsidies run dry?
