Supporters of the expanded OP_RETURN data limit in Bitcoin Core 30 see it as useful for decentralized identity and messaging, while critics argue it encourages blockchain abuse

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“NACK. The goals of transaction relay listed are basically all wrong. Predicting what will be mined is a centralizing goal. Expecting spam to be mined is defeatism. Helping spam propagate is harmful,” Dashjr posted on X (Twitter).
Supporters argue that this could improve the infrastructure for Bitcoin Layer 2 solutions, decentralized identity systems, and BTC-anchored Web3 projects.