How to derive BTC m44 addresses from xpub?
The following key:
xpub6C5oXscLYZwgq2DB42TFC32QcoPa1MeCWUNPZSjydunniCM77TRcBfFnjScJeToVXS5RBDr53Ls5RXvDHujmFSL4Fqc9kkpsMjU1vg68xv7

Corresponds to a level 3 public key w/index of 0x00000080 which is 0h/0'. In the context you've described it probably corresponds to &quot;m/?/?/0'&quot;. This key's parent's fingerprint is 0x3ab9169c, so you'd need to provide the parent's full fingerprint to confirm the original derivation path.
Although m44 &amp; m84 have the same master/root key, they have completely different level 1 keys, which would change all lower nodes. In short you can only derive m/... full paths from root keys, not child keys, which you've provided.
Edit: The key you've provided is probably meant for deriving receive &amp; change addresses of a certain address type.