Todd Proposes Tail Emission to Replace Bitcoin's 21M Cap

Bitcoin's 21 million coin limit has been under debate once again, this time by early developer Peter Todd. In a recent talk, Todd argued that Bitcoin should eliminate its cap and instead adopt a 'tail emission' model, where a small perpetual subsidy continues to create new coins even after the current schedule ends.

Todd framed tail emission as a long-term design question and not a call for an immediate cap change. He noted that fees alone may not be enough to fund adequate security as block subsidies shrink, citing the example of April 8, 2026, when miners collected only $2.443 BTC in daily transaction fees against roughly $450 BTC in daily subsidy.

Bitcoin critics have framed the cap debate as a risk to preserving a monetary rule that users expect to remain fixed. Dan Held, for one, called the idea 'bad' and linked to a 2019 essay arguing that a monetary system conveys information through rules that market participants expect to remain predictable.

Todd suggested that a lower rate of tail emission could be economically small compared to Bitcoin's normal price swings and still give miners a continuing reason to extend the chain. However, he acknowledged that there is no proven example showing that fees alone can fund adequate security at Bitcoin's scale.