Some online challenges or "hidden" treasure hunts provide partial or full private keys for users to find and claim a prize.
Users attempting to recover an old wallet from a printed "paper wallet" or backup. cDWFjmPB2JVi1wN4gciWAXjMeGrCjkaqlcquWEiAGIZ9Zzp...
The string provided appears to be a in Wallet Import Format (WIF). Some online challenges or "hidden" treasure hunts provide