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Coinsbuy posts $100K bounty; onchain investigator puts Sunday breach above $7.9M

More than $7.9 million in unauthorized withdrawals drained from Coinsbuy in a Sunday security breach, according to an onchain investigator's estimate. The exchange posted a $100,000 reward and said it covered all affected client funds.

By Kwame Asante·Aug 10, 2026·1 min read·crypto

Key takeaways

  • More than $7.9 million in unauthorized withdrawals were drained from Coinsbuy in a Sunday security breach, according to an onchain investigator's estimate.
  • Coinsbuy posted a $100,000 reward to help identify the actors behind the breach.
  • Coinsbuy said it covered all affected client funds and labeled its reimbursement as complete.
  • The $100,000 bounty equals roughly 1.3 cents per dollar of the investigator's $7.9 million estimate.
  • Available reporting includes no figure for the number of affected accounts, the attack vector, or the reimbursement methodology.

More than $7.9 million in unauthorized withdrawals drained from Coinsbuy in a Sunday security breach, according to an onchain investigator's estimate. The exchange posted a $100,000 reward and said it covered all affected client funds.

Reward relative to estimated losses

Metric Figure Source
Estimated theft >$7.9M Onchain investigator
Reward posted $100,000 Coinsbuy
Client coverage Full (self-reported) Coinsbuy

The $100,000 bounty equals roughly 1.3 cents per dollar of the investigator's $7.9 million figure. Coinsbuy confirmed unauthorized withdrawals occurred and labeled its client reimbursement as complete. Those two data points, the onchain estimate and the exchange's coverage claim, come from different parties and sit unreconciled in current reporting.

Exchange's stated position

Coinsbuy said it absorbed the cost of making affected accounts whole after the Sunday incident. The $100,000 reward is its stated mechanism for identifying the actors behind the breach. No figure for the number of affected accounts appeared in available reporting.


Source is thin; the piece is written to the available facts. No account count, attack vector, or reimbursement methodology appeared in source material and none has been estimated here.

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Frequently asked

How much was stolen from Coinsbuy in the breach?

An onchain investigator estimated more than $7.9 million in unauthorized withdrawals were drained during the Sunday breach.

What reward did Coinsbuy offer?

Coinsbuy posted a $100,000 reward as its stated mechanism for identifying the actors behind the breach.

Did Coinsbuy reimburse affected customers?

Coinsbuy said it absorbed the cost of making affected accounts whole and labeled its client reimbursement as complete, though this is self-reported.

How many accounts were affected by the breach?

No figure for the number of affected accounts appeared in available reporting.

How does the reward compare to the estimated losses?

The $100,000 bounty equals roughly 1.3 cents per dollar of the investigator's $7.9 million estimate.