Cracking a nut is traditionally read as effort that reaches a hidden reward. It stands for solving a hard problem — getting through the shell to what is worth having.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.