Florida man Trace Mayer (WoT:nonperson), an FBI and IRS collaborator that does affiliate marketing on the side, allegedly attempted an attack on Bitcoin according to multiple attendees of the recent Unconfiscatable conference (archived, archived).

Attendees are claiming Mayer pitched MimbleWimble Coin, an altcoin vulnerable to 51% attacks and debuting with a 50% premine. Mayer has a history of promoting altcoins and invested in companies known for promoting them including Bitpay and Kraken. (archived, archived).

Mayer announced the “Proof of Keys” celebration of the Bitcoin genesis block in December 2018. Mayer has yet to proclaim any "holidays" related to MimbleWimble Coin.