diff --git a/verifier.c b/verifier.c
index b8fc5d1..f26d8e5 100644
--- a/verifier.c
+++ b/verifier.c
@@ -5,7 +5,8 @@ typedef enum verifierstate {
     ASKISSUER,
     GOTISSUER,
     ASKMEMBER,
-    GOTMEMBER
+    GOTMEMBER,
+    ASKATTEST,
 } verifierstate_e;
 
 typedef struct verifier {
@@ -132,7 +133,7 @@ int verifier_getmember(char *buffer) {
     int ret = 0;
 
     switch (verifier.state) {
-        case ON:
+        case GOTISSUER:
             bzero(buffer, MAX_BUFSIZE);
             strncpy(buffer, "PUBLISH\n", 8);
             verifier.state = ASKMEMBER;
@@ -167,9 +168,40 @@ int verifier_getmember(char *buffer) {
 
 //"ATTEST" > "OK"
 int verifier_attestmember(char *buffer) {
-    bzero(buffer, MAX_BUFSIZE);
-    strncat(buffer, "OK\n", 16);
-    return 0;
+    int ret = 0;
+
+    switch (verifier.state) {
+        case GOTMEMBER:
+            bzero(buffer, MAX_BUFSIZE);
+            strncpy(buffer, "ATTEST\n", 8);
+            verifier.state = ASKATTEST;
+            break;
+        case ASKATTEST:
+            if (0 == strncasecmp("ATTEST", buffer, 7)) {
+                printf("MEMBER > VERIFIER: %s", buffer);
+                uint8_t binbuf[MAX_BUFSIZE];
+                char *current = &buffer[8];
+                ecdaa_hextobin(current, binbuf, ECDAA_MEMBER_PUBLIC_KEY_FP256BN_LENGTH);
+                ret = ecdaa_member_public_key_FP256BN_deserialize_no_check(&verifier.mpk, binbuf);
+                if (-1 == ret) {
+                    printf("verifier_attestmember: member public key is malformed!\n");
+                    ret = -1;
+                } else if (-2 == ret) {
+                    printf("verifier_attestmember: signature of member public key is invalid\n");
+                    ret = -1;
+                } else {
+                    verifier.state = GOTMEMBER;
+                    ret = 1;
+                }
+            }
+            break;
+        default:
+            ret = -1;
+    }
+    if (0 == ret) {
+        printf("MEMBER < VERIFIER: %s", buffer);
+    }
+    return ret;
 }
 
 //"LINK" > "NOT IMPLEMENTED"