Peter Todd’s tail emissions reignite Bitcoin supply debate

Bitcoin developer Peter Todd proposed a permanent, small reward for miners after the scheduled block subsidy reaches zero. A video of his July 23 Toronto talk was posted online on Aug. 14 and prompted renewed controversy over Bitcoin’s 21 million coin limit.

Under Todd’s proposal, miners would receive a fixed number of newly created bitcoin in every block after the subsidy ends. He says the steady reward would provide a predictable baseline for miner revenue. Today miner income comes from newly issued bitcoin and transaction fees; the issuance portion halves roughly every four years and is expected to reach zero around 2140.

Todd argues a fee-only model could produce occasional blocks with very high fees. Those large, concentrated paydays could make chain reorganizations economically attractive for miners with large shares of network computing power. A reorganization can reverse recent transactions by building an alternative chain with more work.

The proposal drew strong pushback from many holders and users. Critics on social media called the ideas euphemisms for perpetual inflation and a tax on savers. Messages emphasized the importance of the 21 million cap, with one common response summarized as ’21M is 21M.’ A prominent developer warned that changing the supply rule would require a simple narrative to rally support for a contentious change.

Todd has discussed tail emissions publicly since at least 2022. He proposed a ‘leaky-bucket’ rationale: some bitcoin are lost over time through inaccessible keys, damaged devices and failed inheritances. He mentioned a hypothetical loss rate near 0.1% per year but acknowledged that such loss rates are not directly observable and would be an estimate rather than an auditable parameter.

As an alternative to continuous issuance, Todd described demurrage: a charge applied when long-idle coins are finally spent, with the proceeds routed to miners. Demurrage could be implemented as a backward-compatible soft fork, while permanent issuance would require a hard fork. Holders note both options impose ongoing costs on existing balances, either through dilution or explicit charges when money moves.

Other figures have proposed related fixes. A cryptography executive argued that over long timescales keys will be lost and that bounded ongoing issuance deserves consideration. A separate mid-2026 proposal outlined a plan for a modest per-block reward from around 2040 combined with fee burning.

A supply change would require broad technical and user support. Node operators, miners, exchanges, wallet developers and users would need to adopt the change for it to take effect. Todd acknowledged a tail-emissions hard fork is unlikely to win that level of support in the next five years.

For now, many in the community favor preserving the 21 million limit. Upcoming halvings and the evolution of the fee market will be the immediate tests of whether miner incentives can be sustained without permanent issuance.