The NFT marketplace Blur sprang into action this weekend after detecting a critical bug in its message processing system that affected bids cancelled over the past 80 hours. The incident, which unfolded on the evening of April 22, saw 36 affected bids accepted during a roughly 30-minute window before the team disabled bid acceptance and deployed a fix.
TL;DR
- Blur detected a bug in message processing affecting recently cancelled bids
- 36 affected bids were accepted during a 30-minute window before fix was deployed
- Affected traders will receive double refunds — twice the difference between their bid and the proper top bid
- Blur implemented two additional redundant safety checks to prevent recurrence
- The marketplace accounted for 82% of NFT trading volume in the prior week
What Happened
Blur CEO Pacman confirmed that the team detected a bug at around 8 PM Pacific Time on April 22. The issue affected some bids that had been cancelled in the preceding 80 hours. Upon discovering the error, the team immediately disabled the bid acceptance functionality to prevent further impact.
During the approximately 30 minutes between detection and the shutdown, 36 affected bids were accepted. The team worked quickly to resolve the underlying issue and re-enabled bid acceptance by 11:05 PM PT, roughly three hours later.
Blur’s Compensation Plan
In a move that drew praise from the NFT community, Blur announced that all affected traders would receive refunds calculated at twice the difference between their bid price and the proper top bid, denominated in Ethereum (ETH). For example, if the legitimate top bid was 14.5 ETH and the affected bid was accepted at 15.5 ETH, the refund would amount to 2 ETH.
Notably, affected traders do not need to sell their NFTs to qualify for the refund. Blur committed to sending the compensation within 24 hours of the incident, a response that community members described as a “classy move” and evidence of professional crisis management.
Additional Safety Measures
Beyond fixing the immediate bug, Blur implemented two additional redundant safety checks designed to ensure similar issues cannot recur. Bids above the floor price are now automatically cancelled before bid acceptance is re-enabled, adding a layer of protection for traders on the platform.
This is not the first time Blur has addressed user-facing issues with compensation. In December 2022, the marketplace offered a 50% refund to a user who lost 70 ETH due to a user interface issue with its bidding system. The user had accidentally paid 70 ETH for an Art Gobblers NFT after depositing over 140 ETH into the bidding pool.
Market Context
The bug fix comes at a time when Blur is dominating the NFT marketplace landscape. The platform, which launched in October 2022, accounted for approximately 82% of NFT trading volume in the week leading up to the incident, even as rival OpenSea introduced zero-fee incentives to win back market share. Bitcoin traded at around $27,800 and Ethereum at roughly $1,874 at the time of the incident, with the broader crypto market experiencing a pullback amid inflation concerns.
Why This Matters
Blur’s swift response and generous compensation package sets an important precedent for how NFT marketplaces should handle technical failures. The double-refund policy goes beyond merely making users whole — it actively rewards patience and trust. As NFT platforms compete for dominance, the quality of incident response and user protection measures will increasingly differentiate market leaders from the rest of the pack.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. NFT trading carries significant risk, and readers should conduct their own research before participating in any marketplace.
double refunds is wild. most cefi platforms would tell users to pound sand. blur basically paid people to trust them again, smart move when you have 82% market share to protect
its because they had zero choice. any loss of confidence and opensea takes it all back. calculated business decision, not generosity
82% market share and they still paid double. thats how you keep users. opensea would have sent a template email and called it a day
opensea did send a template email once. it said we are aware of the situation and then nothing happened for 6 months. blur handled this right
36 bids in 30 minutes. that bug could have been so much worse if someone found it first and exploited it deliberately before pacmans team noticed
30 minute window for 36 bids. imagine if the bug had been in bid creation not cancellation. whole different scale of damage
two redundant safety checks after the fact. classic close the barn door energy. where were those before launch
where were those before is the right question. 80 hours of cancelled bids sitting in a queue with zero validation is a design choice not a bug
NFTDetective exactly. the bug existed for 80 hours and nobody caught it internally. double refunds are PR not accountability
two safety checks after the fact is standard incident response tbh. you find the bug, fix it, then add redundancy. every major exchange does the same thing
standard response sure, but 80 hours of stale cancelled bids in the queue is not standard. that detection gap is the real issue nobody addresses
slug_curator the difference is blur had 82% market share to protect. most teams would have buried the incident and hoped nobody noticed
36 bids in 30 minutes is a tiny number. blur handled this right but the 82% market share made the PR response mandatory not optional
double refunds on 36 affected bids is probably cheaper than the PR cost of users posting screenshots of their losses on twitter. smart calculation either way
Lena K. blur paid maybe $50k total in double refunds. a single screenshot of a broken bid on twitter would have cost them more
the PR math is simple. $50k in refunds vs a viral screenshot of a broken bid costing millions in user trust. blur understood content engine economics better than opensea ever did
exactly. 36 affected bids, double refunds, everyone moves on. opensea would have spent 3 weeks investigating then offered a $10 credit