DataHoarder publishes timeline of historical Monero 18-block reorg from September 14 2025

Monero contributor DataHoarder¹ has published a full archive² of 115 invalidated mined transactions³ and all orphaned (and non-orphaned) blocks⁴ that apparently resulted from the historical September 14 2025 Monero 18-block reorg⁵:

On September 14th 2025, from 05:10 to 06:20 UTC, Qubic mined an alternate chain from height 3499659 to 3499678, for a total of 20 blocks. This alternate chain attempted and succeeded in orphaning the then canonical chain from height 3499659 to 3499676, for a total of 18 blocks. [..] There is an ongoing marketing and disinformation campaign by Qubic, downplaying the damage done or straight out claiming the transactions never existed in the first place, or that the reorg never happened! This is pure madness, insanity, and malevolence.

Log entries summary

[Time] [Notes]
05:12  Attacker mines first selfish alternate block
05:33  Attacking chain reaches enough depth to cause a 10 block reorg
05:49  Monero reaches 10 block height since attacking chain split
05:53  10 invalidated transactions
06:01  28 invalidated transactions
06:03  Attacker witnesses existence of orphan chain by mining Tari
06:15  Attacker mines their last block before reorg
06:16  31 invalidated transactions
06:21  Chain reorg invalidates previous transactions; Monero is now the attacker's tip
06:24  Monero witnesses existence of orphan chain; First post-reorg Monero block

For Monero blockchain consensus live status updates visit DataHoarder’s Monero Blocks⁶ and Rucknium’s Monero Consensus Status⁷ pages.

The community is currently considering various medium/long-term proposals submitted by Monero researchers and devs, including tevador’s Publish or Perish⁸ and Lucky transactions⁹, fluffypony’s Detective Mining¹⁰, and also Rucknium’s rolling DNS checkpoints¹¹ - which is a temporary emergency measure.

Join the MRL channels¹² to get involved in the technical discussions around this ongoing issue.

This is an ongoing story and the report will be updated when new information is available.