It's Dog's knot--I'm hoping to learn it from him next time we get together-we are LDR. The safety knot is tied on one hand only; I think the idea is that if I really need to, I can get that hand free, then use it to release the rest on my own. Although I feel totally safe with Dog, I can never forget the Stephen King book, Gerald's Game, in which the top dies, leaving his bottom stuck in handcuffs, so I know it is a good idea. After all, anything can happen. I like to hold onto my restraints, not just have them on my wrists, so I can sort-of convince myself that the safety knot rope is just a little thicker. Yes, it is frustrating, a little, but on the whole, it makes me grateful that my first BDSM partner is so concerned with my safety. I've mentioned elsewhere that he and I were just friends for about 15 years before our relationship turned sexual at all, so I already trusted him a lot. Having him be so safety conscious is an added bonus, but may spoil me for any other top. I might expect him to be the same. I guess if this relationship ends, I will have to be doubly on guard about safety, since I don't really have to think about it now, if you get what I mean.
Once I learn the knot, I will try to explain it here, but I think it is related to the slip-knot used to tie horses. He (Dog) is in finals right now, but I will shoot him an email and ask if he can explain his technique--but don't hold your breath (pun intended!)
Thank you for the kind comments-I'm such a newbie at all of this, but I am a teacher at heart, so it feels really good to know that I was able to contribute and not just ask for help.