{
  "manageEntity": {
    "action": "Save",
    "entityId": "221383",
    "entityType": "Track",
    "nonce": "0x57df1801cfa113053af43610298f82691714b9431bc26e27759d63ef47ce8e08",
    "signature": "0x707894f5b3b7118774d84333e841981adb416389181fe19f495ea1af830b05393c2a551fa4041d136e2be302fb0bc549dd5feb02994a27b4509e264cb5231db81c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}