{
  "manageEntity": {
    "action": "Save",
    "entityId": "1393325231",
    "entityType": "Track",
    "nonce": "1787902394496293078",
    "signature": "0x493aa314149be12927e90c4ae27f17de2a647968e66af7c327d8ea6432f0f2163b2424b732da77077232c72500c057e097126d4d098272fc306f5eaba8f885c81b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}