He reportedly showed the police a poorly written ransom note riddled with spelling mistakes asking for $10 million in the cryptocurrency Monero.
source https://www.google.com/url?rct=j&sa=t&url=https://www.thedailybeast.com/kidnappers-demand-dollar10-million-cryptocurrency-ransom-for-norwegian-billionaires-wife&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNF-iKMqcy6GVVa5f3xrUYp-G5C73w
