What format is this scriptPubKey? I'm running BitcoinUnlimited's giga_perf branch of bitcoin in regest mode, and I'm noticing a different format than P2PKH in the scriptPubKey when running listunspent over rpc.

Typically I see scriptPubKey's in the P2PKH format:

'76a914' + b58check_to_hex(address) + '88ac'


But with this implementation I'm seeing:

'2103' + ??? + 'ac'


Some examples below, what format are these scriptPubKey's in?

{
  "txid": "07ad742b0bab1c5e65fe720459747aa687d293fef0d0f168297bcaafbe73f17b",
  "vout": 0,
  "address": "mrjTCJGC7aYdZsy3gUJMpBesgtH1ymybsN",
  "scriptPubKey": "21031f5ce0854d50e632bd7002ae5aff977396376082e45329fcdf1af52ab68f766bac",
  "amount": 50.00000500,
  "confirmations": 101,
  "spendable": true
}, 
{
  "txid": "d7f623f59d8fa37eea5fafeb3819ecd76750bea9bb48d453e0eb13426c7e707e",
  "vout": 0,
  "address": "n2Faf95smgYu6e9aBVAwwzp6oULnL7SSSs",
  "scriptPubKey": "21039ff795e5433e67b418e100938ac72e2713a1661c15f48a5c198a5086d96285beac",
  "amount": 50.00000000,
  "confirmations": 108,
  "spendable": true
}
Those are Pay to Pubkey scriptPubKeys. P2PK is in the format &lt;pubkey len&gt; &lt;pubkey&gt; OP_CHECKSIG. The 21 is the pubkey length and the 03 is the first byte of the pubkey. The ac is OP_CHECKSIG.