Bitcoin addresses based on Base58 (this kind of “1PnVcifB9EBwbaAauprqcucPgfUnrRLtWg”) are generated on the basis of a random 256-bit value. Someone will now talk about cid phrases and so on, but no, a cid phrase is essentially a shortened 256 bit number. (those who know the mat part do not swear, all I understand perfectly well, just trying to explain in a simple way). In general, a random 256-bit number turns into a 64-bit number, it turns into a private key, and a public key is created on the basis of the private key by caching.