I'm not sure, but as i know, there is no trusted KYC providers for any crypto service. Maybe except those that located in USA and EU. So you should check registration of your crypto book. If ti's not EU, maybe you should better to use fiat books?
I do not know if there is any, but I remember when we were investigating a case against sportsbet.io then they talked about a site who do the KYC for them and I remember when I searched for them on google it felt like they have been doing this from a long time and seemed legit third party KYC provider. Their service was the response with KYC result. Like approved and not approved. So I am assuming the clients did not need to send KYC details to sporsbet.io but that third party company checks everything.
Obviously it costs money when a bookie will use third party KYC provider and if it is in house then there must be less cost. But when it is in house you are trusting the new bookie without knowing that if they will misuse it.
