{
  "manageEntity": {
    "action": "Save",
    "entityId": "1233437247",
    "entityType": "Track",
    "nonce": "0x787a7dd353374711f80168d695418785aba7ea3ea4d741274bd26b423c249691",
    "signature": "0xca92b4f3d730d2793e745a6d8acd9793c3fcc85eaf0002419d34502b655ac9d479f754be9fe3b76786c9482f156305654ecdfb3f456d99ab2073f679624498b61c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}