{
  "manageEntity": {
    "action": "Save",
    "entityId": "555853707",
    "entityType": "Track",
    "nonce": "0x427b5818d43fd1b0627f568f7ad95abf6519042bb3b84e84cd7d8126999f6526",
    "signature": "0x1644765ddb9b73cc6896e6086aaf0c13c7008ee51ba673fa1313c633f527838e36a2029206ea249849413b647922ca407d9678160fe5b7d9ee89cf742b25d4101b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}