{
  "manageEntity": {
    "action": "Save",
    "entityId": "1864616158",
    "entityType": "Track",
    "nonce": "0x9019b8eb988062c50caecb073ff16b4369e1ef5b45f9c2a40cd19d1508f550a5",
    "signature": "0x8b519da2c16aa84a153d4b909f9c52f873f0d528accf8ad9d90a6dc60ce212bf4c82c187a21fe67f73a199a6c91180750ed51a42c77d3d879a1f0df3b5f1ffe11b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}