{
  "manageEntity": {
    "action": "Save",
    "entityId": "702187",
    "entityType": "Track",
    "nonce": "0x87654c7b0bce9e258c9fe000a0f2b4d735460608bb9ae878700f9793f971539b",
    "signature": "0xc9875d8692982ce90fafcaf791b90f46b1ff98b6a43e44dbb735cd3c6e43a09826afd7f513c7f22f53927637505c2063a1f19f16df59c3336f92e499a7dccc011b",
    "signer": "0xc97A6025Ad8c7Ba1a35Ef7E3A3b88ABc8b2013BF",
    "userId": "666092734"
  }
}