got - gotten

zyc50

Both are correct past participles of the verb get. Either can be used in combination with has or have, with the meaning of become or been.
  Examples
  She has got tired of it; I have gotten tired.

  In this construction, gotten is more common in AmE* .. Got is more common in BrE*.

  Be careful, though.
  Got and gotten are not always interchangeable.
  When the idea of possession is intended, got is used, merely intensifying the sense of has or have! Gotten can't be used here.

  E.g.
  'She has got a brother', or more likely, 'she's got a brother'. Not ''She has gotten a brother'.

  When the idea of obtaining is intended, gotten is normally used, though it is not an offence to use got.
  E..g
  She has gotten a postponement.

  This difference can be quite significant in usage.

  'He's gotten the money' can only mean that he obtained the money. 'He's got the money' means that he had the money all along.(at least in AmE)

  Got (not gotten) is also used to express an obligation or necessity:

  'She's got to find the money'.