High chance of Getting permanent backlink

Last week i created a backlinks on some of the authority site. after a few hours i check the backlinks that i created but links were gone because the owner of the website deleted my account. So, i was thinking that how did the website owner found out that i created a backlinks on his/her site?.
I found out that when you register on their website they will know who is the newest member and probably check your profile if you are just spamming their site.

So, my idea is to register on their site first and don't put any backlinks because the website owner will probably check the profile of their newest member and if they find out that you put backlinks on their site, they will not hesitate to delete your account. So, the best way to put backlinks is after the day you register on their site. In this way you will get a higher chance of creating a permanent backlinks. and sorry for my English

Yes there are a lot of ways through which you can gain Permanent backlinks. They are:

1. Quality blog comments.
2. Social bookmarks.
3. Anchor Text backlinks from Forum signatures.

if you like Permanent backlinks from Authority forums, then just post relevant posts and make sure your Signatures is not spammy

Regards.

Alot of forums have problems with "advertising" on their website, though.