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Open /contact/challenge in your browser to get a JSON response with challenge_id, salt, and difficulty.
Run this script with the salt value:

#!/usr/bin/env python3
import hashlib, sys
salt = sys.argv[1]       # paste salt from JSON response
difficulty = int(sys.argv[2]) if len(sys.argv) > 2 else 18
full_zeros = difficulty // 4
remain_bits = difficulty % 4
max_char = (16 >> remain_bits) if remain_bits else 16
nonce = 0
while True:
    h = hashlib.sha256((salt + str(nonce)).encode()).hexdigest()
    ok = all(c == "0" for c in h[:full_zeros])
    if ok and (remain_bits == 0 or int(h[full_zeros], 16) < max_char):
        print(f"Nonce: {nonce}")
        break
    nonce += 1

Usage: python3 solve.py SALT [DIFFICULTY]

Challenge ID Puzzle Nonce