{
  "manageEntity": {
    "action": "Save",
    "entityId": "788878403",
    "entityType": "Track",
    "nonce": "0x1816f8993abda62134185919705786d224533b852fa90049a13e78c30eef5b9e",
    "signature": "0x6487cc27106c366bdecd1e123b8e990267d0f4997b7cde7eb84e03ca3f3045551b695cdb80352149a0ec66aa65cad27a47489c89edb90562687c372709e95a421c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}