Accessing Members

The TRISAMembers service is an experimental service that provides extra, secure access to the directory service for verified TRISA members. Only members of the TRISA network (e.g. members who have been issued valid identity certificates) can access detailed directory service data about the network using this service. Note: Once validated, this service will be moved into the official TRISA specification.

The TRISAMembers Service

This section describes the protocol buffers for the TRISAMembers endpoint, which can be found here. This file can be compiled into the language of your choice (example for Go). Note: You will need to download and install the protocol buffer compiler if you have not already.

Currently, the TRISAMembers service is comprised of only a single RPC — the List RPC. Other experimental, secure RPCs may be made available in the future.

service TRISAMembers {
    // List all verified VASP members in the Directory Service.
    rpc List(ListRequest) returns (ListReply) {};

Listing Verified Members

The List RPC returns a paginated list of all verified TRISA members to facilitate TRISA peer lookups. The RPC expects as input a ListRequest and returns a ListReply.


A ListRequest can be used to manage pagination for the VASP list request. If there are more results than the specified page size, the ListReply will return a page token that can be used to fetch the next page (so long as the parameters of the original request are not modified, e.g. any filters or pagination parameters).

The page_size specifies the number of results per page and cannot change between page requests; it’s default value is 100. The page_token specifies the page token to fetch the next page of results.

message ListRequest {
    int32 page_size = 1;
    string page_token = 2;


A ListReply returns an abbreviated listing of VASP details intended to facilitate peer-to-peer key exchanges or more detailed lookups against the Directory Service.

The vasps are a list of VASPs (see definition of VASPMember below), and the next_page_token, if specified, is notification that another page of results exists.

message ListReply {
    repeated VASPMember vasps = 1;
    string next_page_token = 2;


A VASPMember contains enough information to facilitate peer-to-peer exchanges or more detailed lookups against the Directory Service. The ListReply will contain a list of none, one, or multiple VASPMembers.

message VASPMember {
    // The uniquely identifying components of the VASP in the directory service
    string id = 1;
    string registered_directory = 2;
    string common_name = 3;

    // Address to connect to the remote VASP on to perform a TRISA request
    string endpoint = 4;

    // Extra details used to facilitate searches and matching
    string name = 5;
    string website = 6;
    string country = 7;
    trisa.gds.models.v1beta1.BusinessCategory business_category = 8;
    repeated string vasp_categories = 9;
    string verified_on = 10;

Connecting with mTLS

To use the TRISAMembers service, you must authenticate with mTLS using the TRISA identity certificates you were granted during registration.

The gRPC documentation on authentication provides code samples for connecting using mTLS in a variety of languages, including Java, C++, Golang, Ruby, and Python.

For example, if you were using Golang to connect to the Directory Service, you would use the tls, x509, and credentials libraries to load your TRISA identity certificates from their secure location on your computer and construct TLS credentials to mutually validate the connection with the server. Finally you would use the compiled members protocol buffer code to create a members client. Note: the protocol buffer definitions are described more fully earlier in this page.

import (

    members ""

func (m *MyProfile) Connect() (_ members.TRISAMembersClient, err error){
    config := &tls.Config{
		Certificates: []tls.Certificate{m.Cert}, // m.Cert is your TRISA certificate parsed into a *x509.Certificate
		MinVersion:   tls.VersionTLS12,
		CurvePreferences: []tls.CurveID{
		PreferServerCipherSuites: true,
		CipherSuites: []uint16{
		ClientAuth: tls.RequireAndVerifyClientCert, // this will ensure an mTLS connection
		ClientCAs:  m.Pool, // m.Pool is a *x509.CertPool that must contain the RA and IA public certs from your TRISA certificate chain

    var creds *credentials.TransportCredentials
    if creds, err = credentials.NewTLS(config); err != nil {
        return nil, err

    var cc *grpc.ClientConn
    if cc, err = grpc.Dial(m.Endpoint, grpc.WithTransportCredentials(creds)); err != nil {
        return nil, err

    return members.NewTRISAMembersClient(cc), nil

Note that there are currently two TRISA directories; the TRISA TestNet, which allows users to experiment with the TRISA interactions, and the VASP Directory, which is the production network for TRISA transactions. If you have registered for the TestNet and have TestNet certificates, the endpoint you will pass into the dialing function will be members.testnet:443. Alternatively, if you wish to access members of the VASP Directory and are already a registered member, you will use the endpoint