Stephan Livera Podcast

Bitcoin Spam: A Libre Relay View with Proof of Cash | SLP703

Nov 17, 2025
In this discussion, Kevin Cai, a platform engineering lead at Lightning Labs and a Bitcoin developer known as Proof of Cash, delves into the Bitcoin spam debate. He examines the distinction between consensus and policy, arguing for decentralization and the importance of nodes relaying valid transactions. Kevin discusses the implications of UTXO consolidation, dust limits, and how miner behaviors shape transaction fees. He highlights the necessity of programmability for Bitcoin's future, noting that economic incentives will dictate the evolution of transaction policies.
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ANECDOTE

Running Multiple Node Implementations

  • Kevin runs multiple node implementations including Libre Relay, Core, and Nots to test behaviors.
  • He uses this multi-node setup to validate relay differences before deploying changes widely.
INSIGHT

Consensus Versus Policy Distinction

  • Consensus is binary but policy is subjective and acts as a nudge for user behavior.
  • Kevin argues aligning consensus with permissive policy preserves censorship resistance and redundancy.
INSIGHT

Spam Is A Subjective Judgment

  • Labeling transactions as 'spam' is subjective and can be conflated with censorship or compliance decisions.
  • Kevin warns that pruning others' transactions undermines Bitcoin's redundancy and anti-fragility.
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