jm Lë7Ï_ÍDøÄyyJff2óÎáÞ¢êÅÞD]÷LI followed their process: start "with the 160-bit all-zero hash value" and loop "upward with step-size 1 until an address ended with substring 'whc'".
https://whatsonchain.com/tx/81cb83bbfb08e37791e4a1f57b08be3759eb9efbea66ecc095b57878d376d5d4