Hack history / 2020 / Hack or exploit
Ethereum Classic
Hack or exploit on Aug 6, 2020 · Forged Proof
SOURCES AGREE ON DATE AND LOSS · 2 SOURCES
Lost
$1.7M
dollars at the time
Returned
none listed
as the sources state it
Rank
#762
among thefts by dollars lost
What happened
Attackers executed a second 51% attack on Ethereum Classic within a week, controlling the network's hash power to reorganize 4,236 blocks and execute double-spends. The attack lasted over 15 hours, resulting in at least $1.68M in stolen value through block reorganization and transaction reversal.
Details
- Date
- Aug 6, 2020
- Kind
- Hack or exploit
- Method
- Forged Proof
- How in
- Bridge and cross-chain
- Target
- Layer 1
- Chains
- Ethereum Classic
Reported by
Related incidents
Verus-Ethereum Bridge 2026 · Hack or exploit · $7.5M
Verus-Ethereum Bridge 2026 · Hack or exploit · $11.6M
Prysm consensus client bug causes Ethereum validators to lose over $1 million 2025 · Hack or exploit · $1.2M
Ethereum Foundation 2024 · Hack or exploit · undisclosed
Ethereum Foundation 2023 · Hack or exploit · $9K
Verus-Ethereum Bridge 2026 · Hack or exploit · $11.6M
Prysm consensus client bug causes Ethereum validators to lose over $1 million 2025 · Hack or exploit · $1.2M
Ethereum Foundation 2024 · Hack or exploit · undisclosed
Ethereum Foundation 2023 · Hack or exploit · $9K
Cite this page
SwanBluechip, "Ethereum Classic hack, Aug 6, 2020: $1.7M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/htba6ae7126e/ (data as of 2026-10-31).