Bitcoin Core announced that it will remove the 80-byte limit for OP_RETURN transaction outputs in its next software update.
Bitcoin developer Gregory Sanders stated on GitHub on May 5th that "the next release of Bitcoin Core will relay and mine transactions containing OP_RETURN outputs exceeding 80 bytes by default".
Sanders explained that the 80-byte limit was originally a "cautious signal not to excessively use block space for non-payment purposes", but its usefulness has now disappeared. Currently, many private mining accelerators are already ignoring the limit, and users are finding ways to bypass it.
OP_RETURN is a Bitcoin transaction output type that allows storing small amounts of data on the blockchain. Unlike regular outputs, it cannot be used and is not included in unspent transaction outputs (UTXO).
Developers pointed out that users are inserting data through more complex methods, such as creating fake output public keys or using scripts that can hide data. This makes network management more difficult and reduces efficiency.
While a blacklist was proposed to prevent such techniques, developers rejected it. The reasons include low reliability, difficulty in maintenance, and the potential for legitimate users to lose funds.
Sanders emphasized that this limit removal will not weaken Bitcoin's security. Other safeguards, such as the 4 million weight unit block limit, will remain in place.
However, this announcement has sparked controversy in the cryptocurrency community. Luke Dashjr, maintainer of Bitcoin Knots, criticized it as "complete madness". Bitcoiner Samson Mow mentioned on X on May 5th that "users can continue to use version 29.0 or run other implementations".
Critics also pointed out that this proposal was introduced without proper decision-making processes. Marty Bent, managing partner of Ten31 Fund, said, "It is clear that there is currently no consensus on the OP_RETURN issue".
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