As bitcoin and ether remain in the red on Monday, here are five things worth knowing in crypto from the past week – from Jack Dorsey confirming Square is building a bitcoin hardware wallet to TikTok banning cryptocurrency promotions.

1. Sen. Elizabeth Warren gives the SEC a deadline for answers on crypto regulation

On Wednesday, Sen. Elizabeth Warren, D-Mass., addressed a letter to Gary Gensler, the chairman of the U.S. Securities and Exchange Commission (SEC), calling for more crypto regulation.