Jimmy Song - Inside the Bitcoin Betrayal

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Nov 3, 2025

Jimmy Song, a prominent Bitcoin developer and educator, shares his insights on the complexities within Bitcoin Core development. He explores the political dynamics surrounding funding models and the implications of uniform mempools for decentralization. The conversation touches on the controversial changes to OP_RETURN, the motivations behind the shift from Core to Knots, and the potential risks of community division. With an eye on future developments, Jimmy argues that despite conflicts, the scrutiny could ultimately strengthen Bitcoin's resilience.

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ADVICE

Favor Faster Block Propagation

Keep mempools similar to speed block propagation and reduce stale-block risk via compact relay techniques.
Faster propagation improves finality and makes fee estimation and network reliability better for everyone.

INSIGHT

Mempool Costs Drive Policies

Nodes have rational incentives to restrict relay policy because bandwidth, CPU, RAM, and storage are real costs.
Upload costs multiply: hearing transactions from one peer causes many uploads to other peers.

INSIGHT

OP_RETURN's Purpose And Controversy

OP_RETURN is an opcode that stores arbitrary data by terminating script execution, originally limited to small bytes for timestamping via hashes.
Core v30 increased OP_RETURN defaults dramatically, raising controversy over mempool use and UTXO bloat.

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In this episode, I chat with Jimmy Song, a Bitcoin developer and educator that has been a driving force in Bitcoin for over a decade.

We dive deep into the political undercurrents around Bitcoin Core development, funding models, decentralization theater and the question on everyone’s mind: Is Bitcoin under attack from within?

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