Abstract
This study examines the legal regulation of transactions in Indonesia and the application of progressive law in addressing money laundering crimes conducted through transactions. The development of blockchain technology and the increasing use of crypto assets have created the potential for misuse as a means of concealing or disguising the proceeds of criminal activities. The issues discussed in this study are the legal framework governing transactions in Indonesia and the application of progressive law to money laundering offenses involving transactions. This research employs a normative juridical method using statutory and conceptual approaches. The findings indicate that is not recognized as a legal means of payment in Indonesia; however, it is permitted as a crypto asset that may be traded and supervised by the state. Furthermore, crypto assets may constitute the object of money laundering offenses as they fall within the category of assets with economic value. The application of progressive law to money laundering offenses involving transactions is carried out through legal interpretations that adapt to technological developments, allowing crypto assets to be covered by the anti-money laundering regime despite the absence of specific regulations governing them. Therefore, the progressive law approach plays an important role in supporting the effectiveness of law enforcement against money laundering crimes in the digital era.