{
  "manageEntity": {
    "action": "Save",
    "entityId": "568838",
    "entityType": "Track",
    "nonce": "0x349edbce7c859385a00ca2f845872bd3e11fee113382d9bd44b4b1763e6e17b6",
    "signature": "0x59f1f0853eee4a25ff526797b1faa9257ec255590c7397c60f6313e9ba4c367866d49d7d1fccd92e0a6c346ddf17838c83da2587084f67014f9d10eb929835731c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}