Deriving entropy on COLDCARD wallet with BIP85

"One seed to rule them all, One Key to find them, One Path to bring them all, And in cryptography bind them."

This article is about BIP85, setting up a @COLDCARDwallet from scratch, & using a primary seed to derive entropy for @bluewalletio & Bitcoin Core. The cool thing about BIP85 is that it enables one to create several keys for several Bitcoin wallets from a single, primary seed. i.e., you just have 1 seed to secure and then all of your Bitcoin wallets are safe. Perfect for people who like trying several wallets, like myself. I maintain a note book with pages and pages of all the mnemonic seed words for all the wallets I have tried out. The nice thing about this method is that now the only information I need to securely backup is one master seed phrase for my ColdCard, the BIP39 passphrase, and the index numbers for each derived key. Then I can take any of the derived keys and import them to a wide range of available wallets.