Cardano’s Splash fix patches the exploit, but leaves 2.4M ADA missing and holders trapped
Three days after Splash’s Cardano-based ADA/OADA StableSwap pool was drained, OADA holders nonetheless confronted an issue that corrected code alone couldn’t remedy: the pool had misplaced the ADA that offered their significant route out of the token.
Splash’s incident report mentioned one actor used two transactions on Sept. 13 to take away 2,434,648 ADA and 1,988,222 OADA. After subtracting the attacker’s 9,870 ADA deposit, but earlier than community charges, the ADA drain was 2,424,778.
Why a code patch is just not a liquidity fix
The pool’s validator calculated a “tradable” reserve by subtracting accrued protocol charges from its actual balances. According to Splash, it didn’t require that reserve to stay optimistic, bounded payment modifications solely from under and didn’t implement the path of a swap.
Those missing checks allowed the validator to just accept a transaction after the tradable ADA reserve had turned adverse. Splash mentioned a reserve-domain verify or a two-sided payment sure would have stopped the reconstructed assault.
Either fix would shut the documented exploit path. Neither would return the ADA that had already left the pool. Immediately after the drain, the pool held 10 ADA and about 1.44 million OADA, whereas its tradable ADA reserve was adverse and its LP token steadiness was unchanged.
The balance-sheet harm issues as a result of Splash’s Sept. 13 snapshot mentioned OADA had no protocol-level redemption. Other OADA venues in the report have been near empty at the moment, with the listed swimming pools holding solely single- or double-digit ADA balances.
The attacker’s OADA sale created one other constraint. At 14:53 UTC on Sept. 13, a Minswap V2 OADA/FLDT pool held 1,763,923 OADA in opposition to 45,751 FLDT. Splash mentioned new ADA/OADA liquidity might be arbitraged in opposition to that stock, permitting discounted OADA to compete for any recent ADA positioned in a reopened pool.
A code patch can cease the documented exploit path, but restoring an OADA exit additionally requires ADA liquidity or redemption and administration of the thin-pool OADA stock.
A usable relaunch would due to this fact require greater than corrected validator logic. It would want replenished ADA liquidity or a protocol redemption mechanism, together with a approach to tackle the OADA stock in the skinny secondary market.
Optim Finance said on Sept. 13 that its protocol was paused, remaining liquidity had been eliminated and OADA-to-ADA swaps have been unavailable. In a Sept. 15 update, it mentioned it was indexing the chain and compiling a full accounting of impacted addresses and property whereas working towards a decision. That replace didn’t announce restored liquidity, redemption or operations.
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