Vastaamo was a Finnish private psychotherapy service provider founded in 2008. On 21 October 2020, Vastaamo announced that its patient database had been hacked. Private information obtained by the perpetrators was used in an attempt to extort Vastaamo and, later, its clients. The extorters demanded 40 bitcoins, roughly worth 450,000 euros at the time, and threatened to publish the records if the ransom was not paid. To add pressure to their demands, the extorters published hundreds of patient records a day on a Tor message board.

Extortion is the practice of obtaining benefit through coercion. In most jurisdictions it is likely to constitute a criminal offence; the bulk of this article deals with such cases. Robbery is the simplest and most common form of extortion, although making unfounded threats in order to obtain an unfair business advantage is also a form of extortion.