An important piece of news can be seen as a victory for the 'progressive side' in the Bitcoin community: the upcoming Bitcoin Core v30 update will raise the OP_RETURN limit. This promises to open up many new functionalities for the network, beyond just storing regular transaction information.
According to a notice from developer Gloria Zhao on the evening of June 9, 2025, the upcoming Bitcoin Core v30 version scheduled for deployment in October will allow node operators to customize the OP_RETURN limit from the current 80 bytes up to 4 MB. Ms. Zhao explained that this software should reflect all the desires of the Bitcoin ecosystem. Therefore, Bitcoin Core v30 will increase the default OP_RETURN limit to 4 MB, but still allow users to revert to the old setting if desired.
OP_RETURN has been a highly controversial topic in the Bitcoin community. Supporters like Peter Todd and Jameson Lopp argue that removing the limit will make the network operate more transparently and accurately reflect reality as most miners no longer adhere to the old limit. In contrast, the opposing side led by Luke Dashjr and Jason Hughes is concerned that this change will facilitate spam behavior, causing the blockchain to expand uncontrollably and increasing the burden on nodes.
The proposal to increase the OP_RETURN size has emerged since 2024 alongside the Ordinals - Inscription trend, which is being promoted by participants as it allows Bitcoin blocks to contain more data, adding new functionalities.
The Bitcoin Core v30's increase of the default OP_RETURN limit can be seen as a victory for the 'progressive side' over the 'conservative group', as most node operators will use the default setting. However, the 'conservative side' warns that this will cause users to switch to alternative node software like Knots, which has seen its market share increase from 2% to 11% since the OP_RETURN debate began. #anhbacong
Source: #coin68