Is there any command to display hash vk?

Question

In contact with

Good afternoon. The point is.
Recently I came across a post in contact, where there was a button, join. By clicking on it, the transition to the group was immediately made, and the subscription was made automatically! from this button I got this link,
https://vk. com/away.php?to=http%3A%2F%2Fvk.com%2Fmoscowcitysquare&post=-147771001_237&hash=81999a23154660bfdf&el=button
Going through it, I also subscribed to a group, but then I ran into a problem that from other VK pages, clicking on this link gives an error. Since HASH is formed already another.
The question is actually what. Is it possible to do this, or is there some kind of command so that the hash is generated by itself, for your page, and so that this link works from all accounts at once? I want to make a link, by clicking on which a subscription would be immediately issued.
I found another method with this link: https://vk.com/widget_community.php?act=a_subscribe_box&oid=-119742244&state=1 But here it first redirects
to a page with a window, but I still need to subscribe directly, maybe someone knows how everyone it can be tripled, I have already broken my whole head!

Answer 1

Is it okay that in this case any left site will be able to subscribe you in VK to any left group?