Now, IOTA has officially explained the incident in a recent official publication. According to the statement, the network freeze was an automatic response by the network, to a possible hack.
“The incident was caused by an edge case in transaction structuring. An unusual set of transactions, which may have been constructed as an attack, disrupted ledger state calculation. When the nodes faced issues calculating a consistent ledger state, they reverted to rejecting milestones as a safety mechanism.”
The publication further goes into some specifics about the incident, stating that the problem was at the IOTA Reference Implementation (IRI) level. IOTA states that the IRI could not handle an edge case where transactions are shared between distinct bundles. To solve the issue, IOTA released a new IRI version, v1.8.3, the following day.
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