{
  "manageEntity": {
    "action": "Save",
    "entityId": "188750332",
    "entityType": "Track",
    "nonce": "0xca715f930e4d99b98bcc9a5fcfab2fdeb986a6afb879c9ce422cd77a88a88854",
    "signature": "0xfb9182b3c0d596e89a30b3c76a7a33a266f0b24c070f0fd1448e7b5eb9bdf2284b5a1113df74cf1101a0fce13d6c60d1ec967cb0ce49c600db6dffd590401e3b1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}