2021.md

Blockchain Incidents - 2021

Incidents involving blockchain protocols (e.g. 51% attacks), node and wallet software, other related technologies. Subscribe to Blockchain Threat Intelligence for news of the latest incidents.

• Project: Firo (formely Zcoin)
  Date: 2021-01-19
  Summary: 51% attack for 36 hours with 306 blocks reorged.
  Impact: 866K FIRO ($4M) double spent on Binance. Firo froze attacker's funds and forked to compensate exchanges.
  References:

  • Firo 51% attack post mortem and vote on attackers’ funds by Firo Team

• Project: Nano
  Date: 2021-01-21
  Summary: Ongoing spam attack.
  Impact: Network slow down.
  References:

  • Spam attack (test?) on NANO this morning. 60,000 transactions dumped in 10 minutes... by u/Qwahzi
  • Recent DoS nano network attack and V21.3 fixes by Nano

• Project: Verge
  Date: 2021-02-15
  Summary: 51% attack with 560K block orphaned (200 days worth)
  Impact: Unknown
  References:

  • The Verge Re-Org Attempt: Aftermath by Verge

• Project: Hardhat
  Date: 2021-02-19
  Summary: Project NPM package targeted with a similarly named package.
  Impact: Unknown
  References:

  • Announcement Tweet
  • How MetaMask’s Latest Security Tool Can Protect Developers From Theft