A validation flaw tied to the recent Ironwood upgrade let an attacker create roughly a fifth of the privacy coin's supply out of thin air
Pirate Chain, a privacy coin that shields every transaction by design, has a counterfeiting problem. A flaw in its source code allowed someone to mint around 39.8 million ARRR without authorization, roughly 20% of the token’s total supply at the time.
The network is still running. Users, however, have been told to keep their hands off their wallets while developers work out how to undo the damage.
The vulnerability surfaced on October 14, 2026. It traced back to two separate validation failures connected to Ironwood, a network upgrade that Pirate Chain activated on October 3.
The freshly minted tokens did not sit still. They were moved quickly into the Sapling shielded pool, the part of the network where balances and transfers are hidden by cryptography.
Pirate Chain’s development team acknowledged that the shielded nature of these transactions could make it harder to trace where the illicit coins went next.
One exchange moved fast. NonKYC flagged deposits tied to the exploit, restricted them, and blocked withdrawals to limit further risk.
Pirate Chain’s instructions were blunt. Users were asked not to move funds, and exchanges and mining pools were advised to voluntarily pause operations.
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The proposed fix is more dramatic: a blockchain rollback. The team wants to revert the network to its state as of 20:00 UTC on October 14, with the goal of discarding every block produced after the exploit window.
There was one piece of reassuring news. The team said there was no indication that Pirate Chain’s notary keys or its zk-SNARKs cryptography had been compromised.
Pirate Chain targets a maximum supply of 200 million ARRR. Around 39.8 million unauthorized tokens is a meaningful slice of that ceiling, not a rounding error.
The project also stands out because 100% of its transactions use zk-SNARKs. Unlike chains where privacy is optional, Pirate Chain makes shielding mandatory for everyone.
The rollback itself is a test. It requires coordination among exchanges, miners, and node operators, which is why the voluntary pause matters. If major participants keep processing blocks on the old chain, the recovery gets messier.
NonKYC’s quick decision to restrict deposits and freeze withdrawals likely kept some counterfeit coins from being converted into other assets.
The Ironwood upgrade had been live for only 11 days when the flaw was found. Privacy-focused coins face a particular version of this risk: when supply sits inside a shielded pool, outside observers have fewer tools to spot unusual activity, so the burden falls heavily on the validation rules being correct the first time.
What to watch next: whether the rollback to 20:00 UTC on October 14 is executed cleanly, when exchanges and mining pools resume normal operations, and whether the team publishes a full breakdown of the two validation failures behind Ironwood.