Didn't take long for the puzzle to be solved!
Step 1: The private key in the post leads to the public key 1bitdoN4...
Step 2: The [left] and [right] hidden BBCode represented binary -> "first five"
Step 3: The first five letters of the pubkey are "bitdo". bit.do is a URL shortener.
Step 4: The color code is #01112d. bit.do/01112d redirects to a pastebin with a 'privkey'.
Step 5: The funds were sent from 1bitdo... to 1CaeSAr... A Caesar shift of 13 was used to encode the privkey.
Step 6: Only the letters were shifted. Once you shifted them back 13 places, you got the privkey.
Done.
More puzzles coming soon.
Well done, I had no idea .do was a valid TLD. kept hitting combinations of bitdo and caesar with no success.