{
  "manageEntity": {
    "action": "Save",
    "entityId": "142985",
    "entityType": "Track",
    "nonce": "0xe521118a9692dc2667b35fb5dda0d4ba6dc9099e976acc24e0811b205a5aa75f",
    "signature": "0xeab87e963867847cb779eb85dce4409c2229d3b25a1c3c37eb1a910a295f588044f29c061fb10e6816aa98844ae0a11c3c079811e047f9813c1a5086077c11071b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}