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Uniquely identifying an iOS user
NSString *UUID() {
    CFUUIDRef cfuuid = CFUUIDCreate(NULL);
    NSString *uuid =  (__bridge_transfer NSString *)CFUUIDCreateString(NULL, cfuuid);
    CFRelease(cfuuid);
    return uuid;
}

uuid = UUID();
[keychainItemWrapper setObject:uuid forKey:(__bridge_transfer id)kSecAttrAccount];
NSString *pass_token = randomString(10);
[keychainItemWrapper setObject:pass_token forKey:(__bridge_transfer id)kSecValueData];

#include "OpenUDID.h"
NSString* openUDID = [OpenUDID value];