{
  "manageEntity": {
    "action": "Save",
    "entityId": "962648",
    "entityType": "Track",
    "nonce": "0x45fb2ea60e46eedcc8da33410b1e267782a24e2b3fc7e42e186bdb91340e96db",
    "signature": "0xf72589d03ed81214d67245fe34ea9f11991eafce85cac5330b3ef291f4533e78714eb97542e6919a0a26c3faac4d9494d7f6de33604089099937ecb30df266911c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}