That was a nice yet a little bit tricky way of passing your coins to your loved ones . But what if you died because of a sudden accident (knock on the wood), how did they find where your safety box located? And how can they open it just in case you used a vault? Well, just a "what if".

I think much better to do is pick someone who you trusted the most. The one who really loves you as a whole and not because of your money. You can tell him/her your private keys right away and how can they have it. You now have nothing worry about because if a person really loves you, he will not get tempted with all of the assets you have and try to backstab you over these material things . It is very crucial so choose wisely.