{
  "manageEntity": {
    "action": "Save",
    "entityId": "147362",
    "entityType": "Track",
    "nonce": "0x41dbb59786b98b6555ececd3bdf88f93f01d85147356538cf78f73f39bc36308",
    "signature": "0xf4384bd7139acaa122031c939847c4df97018c69418b0dd50cfe9b11a589494b36ad6a7b0a88e2ad00433893e10885efcf74af1df1d37483f61fdcbea78e34921c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}