Hack history / 2019 / Hack or exploit
Nuls
Hack or exploit on Dec 23, 2019 · Signature Verification Flaw
SOURCES AGREE ON DATE AND LOSS · 2 SOURCES
Lost
$480K
dollars at the time
Returned
none listed
as the sources state it
Rank
#1,169
among thefts by dollars lost
What happened
NULS blockchain was hacked on December 23, 2019, losing 2M NULS tokens (~$480K) through exploitation of a signature verification vulnerability in NULS V2.2. Attackers compromised a NULS team account and transferred the funds. Of the stolen tokens, 548K NULS entered trading markets while 1.45M were frozen. NULS responded with an emergency hard fork at block 87,800 to permanently destroy the frozen tokens.
Details
- Date
- Dec 23, 2019
- Kind
- Hack or exploit
- Method
- Signature Verification Flaw
- How in
- Smart contract bug
- Target
- Layer 1
- Chains
- NULS
After the theft
- Frozen
- yes, amount not stated
“Of the stolen tokens, 548K NULS entered trading markets while 1.45M were frozen.” (DefiLlama)
Reported by
Cite this page
SwanBluechip, "Nuls hack, Dec 23, 2019: $480K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/htbaea28dd34/ (data as of 2026-10-31).