Monero’s ‘Largest’ Reorg Yet Erases 36 Minutes of Transaction History

Monero has shrugged off its largest chain rollback in its 12-year historical past.

The community reorganized 18 blocks, erasing 36 minutes of transaction historical past and invalidating 118 transfers, in keeping with unbiased screens disclosing the incident Saturday.

The native token belonging to the Monero blockchain, XMR, has been little impacted, with it rising greater than 5% on the day. It’s up practically 12% on the week to $302.54, CoinGecko information reveals.

“That is the most important reorg Monero has ever seen,” an XMR group podcaster generally known as Xenu wrote on X, including that the occasion shattered the previous rule of thumb that ten confirmations had been sufficient to think about a transaction remaining.

The rollback occurred between September 14 and 15 at block peak 3,499,659, when mining pool Qubic launched a hidden chain that overtook the principle community. Xenu later claimed that Qubic had mined in isolation “due to egocentric mining, even in any case their reorgs.”

Representatives for Monero’s open-sourcing mission and Qubic didn’t instantly return Decrypt’s request for remark.



Egocentric mining is when a miner withholds blocks they discover and later publishes an extended chain that rewrites current transactions. The tactic takes benefit of proof-of-work guidelines that reward cumulative work with out distinguishing between regular contributions and privately hoarded blocks.

Beneath Monero’s proof-of-work guidelines, the longest legitimate chain is taken into account the “actual” historical past, so nodes instantly swap over.

Within the newest case, Qubic’s withheld chain grew longer than the general public one. When it was launched, nodes robotically accepted it because the legitimate historical past, forcing the community to discard the earlier 18 blocks and the 118 transactions they contained.

The transfer successfully erased greater than half an hour of Monero’s current exercise, regardless that different miners had already confirmed these funds. The reorg additionally demonstrated that ten confirmations didn’t present sufficient assurance, main exchanges to increase their necessities.

Final month, Qubic trieda 51% assault on Monero because it developed methods to “experiment” and “assist” guard the community in opposition to future assaults. 

A 51% assault occurs when somebody controls greater than half of a blockchain’s pc energy and might change how new transactions are recorded, block or reverse them, and probably spend cash twice (double-spend).

Whereas that try was questioned, some group estimates on the time urged it might have briefly reached majority management.

Funds as soon as thought of remaining had been erased, pointing to how concentrated mining energy threatens the community. Some customers stated they would cease accepting Monero till stability returns, whereas others urged miners to maneuver to smaller swimming pools.