Bip39 Passphrase. Get the essential amount of COLDCARDs, choose Import Current through setup and load exactly the same backup file on to each of them. Give Each individual COLDCARD its own passphrase and after that lock down the seed. Your seed words won't be recognized to any of your units https://businessbookmark.com/story5005386/bip39-wallets-https-linktr-ee-bip39-the-bip39-wallet-diaries