{
  "manageEntity": {
    "action": "Save",
    "entityId": "319047",
    "entityType": "Track",
    "nonce": "0xb665d45c44dbbd3985924d7a7c3de12cb8073d5e35f77c1a953d1f97b9ce8c67",
    "signature": "0x4de430a06fb64f0c7aabb6d8db25791607f8783e8983749c6429d3d846cbd43e0c0a000c82c46340a7ff35333198a262becd31f11a20b75462d99f6c412ce4d31c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}