{
  "manageEntity": {
    "action": "Save",
    "entityId": "303082",
    "entityType": "Track",
    "nonce": "0x293a1cd1425f6d4ad30ccce74af3acba0530b89a70f2a902acb6734e3a57add5",
    "signature": "0x7aa517f43cbd87b54fcf684cc21aeb6db70fa4eeb56f0b957076788e8dcdc12d6d786c3ddfc33cb95b59b608019331b8676b24c95b8f90f83504557b88fc96101b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}