{
  "manageEntity": {
    "action": "Save",
    "entityId": "697780",
    "entityType": "Track",
    "nonce": "0xf364b3983f99d7baec030ca23d4766554e84edabd2e465d8908fe59639746bac",
    "signature": "0x1656665caa7812acc784597cd787c4eae487507d6de9f0abd8fe051614edcdb0051e8ee13e08a8a0d773dc914f3709ab1a93a00b3ade7d701d5fd5385e5431671c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}