Bitcoin Core v30 Raises OP_RETURN Limit to 4MB Amid Debate
Bitcoin Core v30 has introduced a new wallet format and dramatically raised the OP_RETURN limit from 80 bytes to nearly 4 MB per output. This change aims to enable on-chain services—NFTs, DeFi and zk-proof applications—by leveraging larger data capacity. Critics warn it will increase node storage and bandwidth costs, weaken decentralization and push up transaction fees as non-financial data compete for block space. Legal experts caution that bigger OP_RETURN payloads could expose full-node operators to lawsuits if illicit content is embedded. Some users are already migrating to Bitcoin Knots to enforce minimal data rules. Supporters argue that higher transaction fees and market incentives will self-regulate on-chain storage, and that built-in pruning options mitigate long-term blockchain bloat. As Bitcoin Core v30 rolls out, traders should watch for any consensus changes that may affect network costs and node operating expenses.
Neutral
The expansion of the OP_RETURN limit in Bitcoin Core v30 is unlikely to drive a clear bullish or bearish trend for BTC price. In the short term, increased transaction fees and node costs may create volatility and deter some users, suggesting potential downward pressure. However, the ability to host on-chain applications like NFTs, DeFi and zk-proofs could enhance Bitcoin’s long-term utility and market appeal, offsetting initial cost concerns. Overall, the net effect on price is neutral as traders weigh short-term fee hikes against future growth prospects.