{
  "manageEntity": {
    "action": "Save",
    "entityId": "321172509",
    "entityType": "Track",
    "nonce": "0xd4f4ae052ae165d0ffd610334442756734188168d26b46cbf0044dc39690bb78",
    "signature": "0xdfe29722033ee50fd079b47d223cf7cc52cf68798d7676b36d8489b9c3f0f6aa07c0c30e67d78a5d0075d02c99936b8c289e3cbceb953ecb8d7a60c127a39cc51c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}