BIP39 stands for Bitcoin Improvement Proposal 39. The words are chosen from a certain list of 2048 typical English words which can be used to the deliver a binary seed (your non-public key). This additional complexity enhances the risk of misplacing the passphrase, and therefore losing your copyright. Seed Phrase https://bookmarkpath.com/story18767019/an-unbiased-view-of-bip39-seed-phrase-github