The casino claims that they are licensed under the laws of the island of Curacao but nothing is confirmed.
On their site they are saying this
Copyright © 2020
www.betchain.com is owned and operated by Dama N.V., a company registered and established under the laws of Curaçao, with registration number 152125 and registered address at Scharlooweg 39, Willemstad, Curaçao, and its wholly-owned subsidiary, Strukin Limited, registered address Pavlov Nirvana & Aipeias, 4, ALPHA TOWER, Floor 1, Flat 11, 3021, Limassol, Cyprus, and registration number ΗΕ 407624. Dama N.V. is licensed and regulated by Antillephone N.V. (license no. 8048/JAZ2020-013). All payments with Paysafe are made via Dama N.V. It is the player’s sole responsibility to inquire about the existing laws and regulations of the given jurisdiction for online gambling.
OP, I found this search tool:
https://www.info-clipper.com/en/May be you can use it to check the registration validity and contact the license provider.
Also to file a complain once you find the company is registered under them then use this link:
https://www.curacao-egaming.com/public-and-players/complaints-landing