Banano Find the Key Puzzle

Update: it's all gone folks! Thanks for joining in the puzzle. I'll keep it here for those who still want a challenge.

The rules are simple. Be the first to gain access to this Banano wallet with the secret key and it's all yours. All 1,000 BAN (~$10 AUD / $7 USD at the time of writing). If the wallet has 0 balance, it means someone has successfully cracked the puzzle and liquidated the account!

Here are the guidelines for solving the puzzle: