Comment by greyface-

Of course there's a script; every bitcoin tx output has a script. These challenges use the standard P2PKH script, i.e.:

  scriptPubKey: OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
  scriptSig: <sig> <pubKey>

https://en.bitcoin.it/wiki/Script