{
  "manageEntity": {
    "action": "Save",
    "entityId": "1609442384",
    "entityType": "Track",
    "nonce": "0x396c357694579b336be635854748b7bd1b75f5b9e5019c58b5e2e8269101f60c",
    "signature": "0x209deac06c7b25a542b71c2b5fab92474d6c325b2e8cc49b77f4810d6dc52f6c0c708a1abb33eea37496982db60c709c6e402d732a97f1db986d5e9fd85f11c31b",
    "signer": "0x3D472a01Cb831ac594835ac6038A4346E2A22B94",
    "userId": "327343"
  }
}