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Bitcoin Core developers have released version 30.0, introducing several architectural and performance improvements to enhance network security and node efficiency. The latest update also brings a significant change to the OP_RETURN data limit — one that has drawn both praise and criticism from the Bitcoin community.
According to the official release, Bitcoin Core v30 includes optional encrypted peer-to-peer connections between nodes to strengthen privacy. In addition, the OP_RETURN data limit within Bitcoin Core software has been raised from 80 bytes to 100,000 bytes, enabling users to embed larger amounts of non-financial data into Bitcoin transactions.
“With the release of this new major version, versions 27.x and older are now considered End of Life and will no longer receive updates,” the announcement stated.
While this new release focuses on refining node functionality, fee rate adjustments, and bug fixes, the drastic increase in the OP_RETURN limit has become the most debated aspect of the upgrade.
OP_RETURN Limit Change Divides the Bitcoin Community
The OP_RETURN field allows users to embed data in Bitcoin transactions, often for purposes beyond simple value transfers. By increasing this limit, Bitcoin Core developers have opened the door for more advanced on-chain applications, such as decentralized data storage, NFTs, and experimental protocols.
However, the move has caused strong disagreement among long-time Bitcoin users and developers. Many believe this update deviates from Bitcoin’s original purpose as a peer-to-peer digital cash system. Critics argue that larger data storage on-chain could lead to blockchain bloat, raising node operation costs and potentially introducing legal risks.
Several Bitcoin supporters have likened the debate to the “block size wars” of 2017, which divided the community and resulted in the creation of Bitcoin Cash. Though the new OP_RETURN change doesn’t alter the base protocol, the controversy highlights a growing philosophical split over how much functionality Bitcoin should accommodate beyond financial transactions.
Supporters Defend the Update’s Broader Utility
Despite the criticism, many prominent figures in the Bitcoin ecosystem have voiced support for the v30 update.
Jameson Lopp, co-founder of CasaHODL, endorsed Bitcoin Core’s latest version, calling it an important step toward improving flexibility and resilience for node operators. Similarly, Pavol Rusnak, co-founder of Satoshi Labs, noted that Bitcoin Core v30 reflects “sane engineering decisions” and praised its development team for maintaining peer-reviewed, high-quality code.
Ark Labs ecosystem lead Alex Bergeron also supported the new OP_RETURN expansion, saying he intends “to use all of the additional OP_RETURN space and make Bitcoin more like Ethereum, except better.” His statement underscores how some developers see this change as an opportunity to explore Ethereum-style functionality directly on Bitcoin without compromising its base security model.
Critics Warn of Potential Blockchain Bloat and Legal Risks
Not all developers share the same enthusiasm. Cryptographer Nick Szabo, known for his early influence on smart contracts and digital currency concepts, urged caution. He warned that the expanded OP_RETURN capacity could lead to the embedding of illegal or copyrighted material within the Bitcoin blockchain — something that node operators cannot easily remove.
“Without safeguards allowing archival node operators to delete illegal content non-disruptively, they could be held criminally liable,” Szabo cautioned on X (formerly Twitter).
In light of these concerns, Szabo recommended that operators consider using Knots, an alternative node software that allows users to manually enforce smaller OP_RETURN size limits. “As a temporary measure, run Knots. I strongly recommend not upgrading to Core v30,” he advised.
Luke Dashjr, the founder of Knots, has also been vocal about maintaining strict data size restrictions. While he has not commented on the v30 release itself, his past remarks suggest skepticism toward expanding Bitcoin’s data storage capacity.
Growing Adoption of Knots as Alternative Node Software
According to data from BitRef, there are currently over 5,100 Knots nodes active on the Bitcoin network, representing roughly 21.5% of all nodes. This suggests that a significant portion of node operators prefer maintaining tighter control over transaction data sizes, possibly as a precaution against future scalability issues.
The rise in Knots usage also reflects broader unease among Bitcoin purists who view Core v30 as a potential step toward centralization risks and increased operational costs for full node operators.
Balancing Innovation and Bitcoin’s Original Principles
Bitcoin Core v30 highlights an ongoing tension between innovation and ideological purity within the Bitcoin ecosystem. While the update offers practical improvements for developers and new opportunities for data-driven applications, it also raises fundamental questions about Bitcoin’s long-term direction.
For supporters, the OP_RETURN expansion represents progress — allowing Bitcoin to remain competitive with smart contract platforms like Ethereum. For critics, it challenges the network’s minimalist design, potentially threatening decentralization by inflating blockchain size.
As adoption of the new version begins, the broader community will closely watch whether these changes improve Bitcoin’s utility or complicate its role as a secure, efficient peer-to-peer payment system.
