The company announced Wednesday (July 22) that it had addressed the vulnerability that permitted the theft of 16.1 million in ADA last month, and had secured another 129 million ADA before hackers could get to it.

“However, given the gravity of this event and as previously announced, we have made the difficult decision to wind down SecondFi and Yoroi wallet,” the company said.

The root cause of the incident was a “highly subtle flaw in how the wallet software generated per-transaction signatures,” SecondFi added.

“In simplified terms, a value that should have been derived from secret information could, under certain…