Hi Hugo, Bitlifi is a nonkyc project from Anycoin. However Its a LN wallet making possible to send satoshis on phone contact. So you still have a change to identify the attacker, if you get the connected number from Bitlifi and if he used registered SIM card. Unfortunately what I know, neither in Czech Republic nor in Romania or Moldova is kyc of SIM card user mandatory. But knowing the connected phone number you can still get more important data from Internet or from the phone company, which can help you with tracking the attacker. Wishing you success to find him