{
  "manageEntity": {
    "action": "Save",
    "entityId": "613296690",
    "entityType": "Track",
    "nonce": "0xe9b3cb586f59937ce2a1b724ec132c8b1919d226ef30bc25e9701865d0f0a834",
    "signature": "0xb25f6ff407ff664c595788d4f50575808e394935bf438b65e75f66d41bfca81f77ea4f93bdb9e95ff5afd9acf1c2924b4555cf0c473389d547026153615130521c",
    "signer": "0x63EbE5a1B5C5F156330BDf810f5fFf6A224c75c8",
    "userId": "309080"
  }
}