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The removal of the OP_RETURN size limit in Bitcoin Core 30, effective October 30, 2025, marks a significant shift in Bitcoin’s technical and philosophical landscape. By allowing up to 4 megabytes of data per OP_RETURN output, the update aligns the protocol with existing practices like Ordinals and inscriptions, reducing UTXO bloat and enhancing flexibility for non-financial applications such as cross-chain bridges and document archiving. Proponents, led by Peter Todd, argue that this change supports Bitcoin’s decentralization by discouraging private blockspace markets and preserving efficient block propagation. However, critics, including prominent Bitcoiners, warn of potential spam, higher costs, and a deviation from Bitcoin’s core monetary purpose. The decision has already sparked community division, with Bitcoin Core’s node share dropping to 88% and alternative clients like Bitcoin Knots gaining traction. As the network adapts, the community will closely monitor performance impacts and ongoing debates about Bitcoin’s identity as either a financial system or a broader data ledger. Make your choice honestly and responsibly
By allowing up to 4 megabytes of data per OP_RETURN output
This is incorect. Also GFY Bot
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Wow, coindesk is really an absolute rag. OP_RETURN does not get the witness discount, so the max is the legacy block size of 1mb.
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Thank you for clarifying.
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70 sats \ 1 reply \ @Norbert 13 Sep
So disappointing that CoinDesk would make an embarrassing mistake like that. I've written the reporter and I hope he will correct it even if the article is a bit old. This debate certainly doesn't need misinformation.
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well done for doing this
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