Bip39 Words. Get the required range of COLDCARDs, decide on Import Existing during setup and load a similar backup file on to each of these. Give each COLDCARD its have passphrase and then lock down the seed. Your seed words will not be recognised to any with the devices and https://techonpage.com/story4453356/bip39-https-linktr-ee-bip39-bip39-words-an-overview