Bitcoin Core 30 to expand OP_RETURN data limit from 80 bytes to 4MB in October 2025

10-6-2025 – The Bitcoin Core development team has unveiled plans for its forthcoming Core 30 release, slated for October, which promises to reshape the network’s operational framework. The update, a triumph for reformist voices spearheaded by Antoine Poinsot, will dramatically expand the OP_RETURN data carrier threshold from a modest 80 bytes to an expansive 4MB. [. source: https://www.cointrackdaily.com/bitcoin-core-30-to-expand-op_return-data-limit-from-80-bytes-to-4mb-in-october-2025/