On April 2023, Sentiment was exploited in a reentrancy, resulting in approximately $1M in losses. That makes the Sentiment exploit the 86th largest DeFi incident out of 690 documented in our archive.
Attack Mechanics: How the Sentiment Reentrancy Played Out
Exploit Class Applied to Sentiment
The Sentiment incident on April 5, 2023 is classified as a Reentrancy. A malicious contract re-enters a vulnerable function before state is updated, letting it drain funds multiple times. In the full archive, Sentiment is 1 of 51 documented reentrancy incidents.
Sentiment in Context
At $1M, the Sentiment exploit is a significant ($1M–$10M) event compared to the largest same-class incident in our archive — Curve (2023) at $41M.
Prior Reentrancy Before Sentiment
The nearest reentrancy incident before Sentiment was – dForce, 54 days earlier on February 10, 2023 ($3.65M lost). The same exploit class surfaced again within the reentrancy attack surface.
Sentiment Vulnerability Signature
The primary source categorises the Sentiment exploit specifically as “Read-Only-Reentrancy”. This narrower label is entity-specific: it reflects how the Sentiment contract failed, rather than the broad reentrancy pattern alone.
Impact & Recovery for Sentiment
Sentiment Loss Figure
The Sentiment exploit caused $1,000,000 in losses — a significant ($1M–$10M) incident and the 31st largest of 214 documented in 2023. This single incident represents 0.2% of all tracked losses that year.
Where Sentiment Sits Among Reentrancy Attacks
Ranked by loss size, Sentiment is the 11th largest of 51 reentrancy incidents documented. That puts the Sentiment loss below the class average of $2.87M.
Timeline Since the Sentiment Incident
The Sentiment exploit occurred 3 years ago (1,105 days). The contract, its fork-block, and the attack transaction remain on-chain and forensically reproducible.
Primary Reference for Sentiment
Public post-mortem / on-chain analysis for the Sentiment incident: view source.
FAQ
How much did Sentiment lose?
The Sentiment exploit in April 2023 resulted in $1,000,000 in losses — the 31st largest of 214 DeFi incidents that year.
When did the Sentiment hack happen?
The Sentiment exploit was recorded on April 5, 2023 — 1,105 days ago.
What type of exploit hit Sentiment?
The Sentiment incident is classified as a Reentrancy. A malicious contract re-enters a vulnerable function before state is updated, letting it drain funds multiple times.
How common is the Reentrancy pattern seen at Sentiment?
Our archive contains 51 documented reentrancy incidents. The Sentiment incident is one of them.
How does Sentiment compare to the largest Reentrancy attack?
The largest reentrancy incident in our archive is Curve (2023) at $41M. The Sentiment loss is $1M.
What makes the proposed defense method low-cost?
It does not involve retraining or altering the classifier's parameters.
What is a significant risk associated with the taxation of cryptocurrencies?
The risk of VAT/sales tax evasion is profound due to cryptocurrencies' nature and transaction methods.