While a 51% attack on Bitcoin will cost a billion dollars, Dash developers say an attacker needs more than money to attack the Dash network.
Source: https://cointelegraph.com/news/raising-the-security-bar-dash-claims-a-51-attack-is-not-enough
Raising the Security Bar? Dash Claims a 51% Attack Is Not Enough
July 30, 2020
CoinTelegraph