Debate Grows Over Bitcoin Core v30 Update After Szabo's Warning
Prominent cryptographer Nick Szabo has publicly advised Bitcoin node operators against upgrading to Bitcoin Core v30, reigniting debate over the software's direction and its implications for the network. His message, posted on October 8 via X (formerly Twitter), highlights a growing divide between supporters of Bitcoin Core and those who back Bitcoin Knots, a fork maintained by developer Luke Dashjr.
Core v30 Introduces Expanded Data Capacity
Bitcoin Core remains the most used client for operating Bitcoin nodes. The new v30 release in October lifts the OP_RETURN output size limit to 100,000 bytes, enabling users to store larger amounts of arbitrary data�such as text or images�on-chain. This change makes it easier to use non-monetary data inscriptions, a feature some in the community view as "spam."
Bitcoin Knots, by contrast, now includes filters that restrict certain transaction types, including those using OP_RETURN or similar inscription methods. Advocates argue this preserves Bitcoin's function as a censorship-resistant monetary network. Critics warn it may limit transaction freedom.
Concerns Over Legal Liability and Network Philosophy
Szabo and others worry that allowing more arbitrary data onto the blockchain could create legal risks. If a node stores problematic content, its operator could face legal consequences. Szabo previously warned about this risk, saying that the update removes plausible deniability for node operators.
Other developers joined the discussion on X. Giacomo Zucco responded by noting that filters in Knots might only reduce, not completely prevent, the propagation of unwanted content. He stressed that just one problematic transaction could still create legal exposure. Still, Zucco shared concerns about the general direction of Core's development.
Developer Wicked urged those uncomfortable with the changes to avoid both Core v30 and Knots, recommending users stick to earlier Core versions pending further analysis. Jameson Lopp also advised caution, recommending thorough research of Knots before switching clients, and pointed out the risks of relying on a single maintainer.
Broader Impact on Bitcoin's Mission
Supporters of Core v30, such as Adam Back of Blockstream, plan to proceed with the upgrade, while others, including Jimmy Song, align with Szabo's concerns.
The debate reflects wider philosophical questions. Some advocate for expanding Bitcoin's use cases, while others call for preserving its original intent as a censorship-resistant digital money. The discussion highlights how ongoing software changes pose not only technical but also legal and philosophical challenges for the world�s largest cryptocurrency network.
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