To use services such as the BKNIX NTP server, RPKI server, etc. without going through a transit provider, you should peer with the BKNIX Services AS, 63528.
Registering in the RPKI
For cryptographically secure resource validation, you shoud register in the Resource Public Key Infrastructure. You need to use the registry from which you acquired your address space; for Thai address holders, this is usually APNIC
Peers filter using the Internet Routing Registries or the RPKI. To register in the IRR, you need to choose which IRR instance to use and then register there. Here are a few of the more common alternatives.