Billy Markus, the creator of Dogecoin, shared his top investment principle for digital assets and his favorite tokens. He advised traders not to invest more in crypto assets than they would be comfortable losing. Markus also expressed his preference for Bitcoin and Ethereum, and characterized Dogecoin as 'Bitcoin in a dog suit'. He showed a lack of enthusiasm for ERC-20 tokens, assets built on the Ethereum network. Dogecoin was trading at $0.06357, down by 18 percent in the last seven days.