The former super, Rosalind Hernandez, was living in a Chelsea apartment building and working as the superintendent when she befriended the resident, Antonio Ruas, and gained his confidence, prosecutors said. After a time, Mr. Ruas, a retired stone setter from Brazil who was in poor health, asked her to sell his apartment and tie up his affairs in exchange for $100,000.

“The shadow financial system created by the explosion of cryptocurrency has created an ideal vehicle for money laundering and other crimes in New York State. Crypto is the go-to means for bad actors to move and hide the proceeds of crime,” Bragg said in a statement.

“Tyshaun Watson is facing accountability for viciously attacking a pizzeria manager. This employee, who was just doing his job, suffered significant injuries and had to be placed in a medically induced coma for two weeks,” Manhattan District Attorney Alvin Bragg said. “No worker should ever have to fear for their safety, and my office will prosecute those who harm them.”

“Crypto is the go-to means for bad actors to move and hide the proceeds of crime,” he added. “It is long past time for businesses that operate without a virtual currency license and flout due diligence requirements to face criminal penalties.”