Murch, Bitcoin Core developer and editor of the official community enchancment proposals (BIP) repository, printed on-chain information exhibiting that OP_RETURN outputs bigger than 83 bytes symbolize simply 0.0032% of Bitcoin’s whole block house.
In his publication, he described that share as “surprising” (in an ironic tone) directed in direction of those that warned that Bitcoin Core v.30 would open the door to doubtlessly unlawful content material and the spam within the Bitcoin community by having enabled these kinds of outputs.
The information comes from two Dune Analytics charts created by Murch himself, overlaying February 2023 to Could 2026. The primary information the weekly rely of OP_RETURN outputs sorted by measurement. Within the week analyzed by Murch, outputs longer than 83 bytes represented simply 0.000075% of the whole outputs.
The second graph measures the whole house occupied by these outputs in bytes per week: these bigger than 83 bytes absorbed 0.14% of the whole house consumed by OP_RETURN outputs, equal to 0.0032% of Bitcoin block house.
Each graphs uncovered by the developer present a low quantity of OP_RETURN outputs exceeding the 83-byte restrict on community utilization.
Opposite to the information offered by Murch, a report printed in mid-April by a Bitcoin node dealer warned that over the past quarter, registrations through protocols resembling Ordinals and Runes and transactions with OP_RETURN accounted for 44% of Bitcoin operations; of this share, virtually 63% have been OP_RETURN outputs.
This information, which coincides with what was reported by CriptoNoticias in October 2025, displays that, contemplating not solely OP_RETURN operations better than 83 bytes, the share indicated by Murch will increase significantly.
OP_RETURN is a Bitcoin opcode that permits arbitrary information (textual content, identifiers, information) to be included inside a transaction. Till Bitcoin Core 29, the restrict for that information was 83 bytes.
In October 2025, and after a debate that had begun months earlier than, Bitcoin Core 30 expanded that restrict to 100,000 bytes by defaulta change criticized by the bitcoiner neighborhood since, in accordance with its detractors, it facilitates the usage of Bitcoin as a file community, rising what they contemplate spam by taking over block house with out transferring financial worth.
Similar information, reverse arguments
Adam Again, co-founder of Blockstream, additionally sarcastically dismissed the alarm. In X he wrote that Bitcoin Mechanic (developer and probably the most energetic critics of the change launched in Core 30) “positively price forking”in sarcastic reference to the place of those that suggest, resembling Mechanic, the introduction of a gentle fork via the BIP-110 proposal to keep away from the inclusion of arbitrary information in Bitcoin. For Again, this proposal is disproportionate to an influence that the information doesn’t assist.
One miner and node operator famous that “so why was it so essential to open it by default within the reference implementation?”, warning that if the usage of OP_RETURN outputs bigger than 83 bytes is so marginal, the extension in Core v.30 wouldn’t have been needed.
Likewise, one other person responded with the identical logic: “It isn’t about amount, however about high quality,” arguing that the present low incidence doesn’t justify having opened the restrict and that the issue shouldn’t be what number of outputs exceed 83 bytes right this moment, however what sort of content material could possibly be embedded tomorrow with out restriction.
Steve Tippeconnic, a developer specializing in quantum, added a extra exact technical criticism. In response to him, increasing the restrict of OP_RETURN didn’t clear up the issue that its defenders argued, since the usage of information embedded within the witnessthe transaction house the place digital signatures are saved and the place protocols like Ordinals may embed info.
Then again, mentioned the quantum specialist, the change opened up a brand new vector to embed information extra instantly and visiblywith out addressing the origin of the talk. “Simply as everybody at BIP-110 predicted,” he wrote, tying that outcome to warnings the proposal had raised earlier than Core 30 was launched.
BIP-110: the proposal that wishes to reverse the change
BIP-110 is a gentle fork proposal created by nameless developer Dathon Ohm that seeks to limit non-financial makes use of of Bitcoin block house, reserving it for funds and settlements. As reported by CriptoNoticias, this proposal was included by default within the newest replace of the Bitcoin Knots shopper, a software program that filters the operations that Core v.30 enabled.
Activation of BIP-110 requires {that a} crucial mass of node operators set up that shopper voluntarily to supply the specified impact. If that adoption doesn’t happen, the BIP-110 guidelines by no means come into impact, since with out sufficient nodes to reject blocks with arbitrary information, the community will merely proceed to just accept them as earlier than.
In that context, Murch’s information reignited the talk over whether or not the expanded OP_RETURN restrict represents an actual threat for Bitcoin or a disproportionate alarm.
