From Cointelegraph
July 11, 2024 9:37 am:

Bitcoin was found not to have been double spent during Ethereum’s 2014 ICO, according to a joint investigation by Magazine and Gray Wolf. However, there are suspicions that illicit actors may have used the blockchain to launder dirty crypto.

Read more at Cointelegraph.: Decade after Ethereum ICO: Blockchain forensics end double-spending debate