{
  "manageEntity": {
    "action": "Save",
    "entityId": "1403945342",
    "entityType": "Track",
    "nonce": "1788107551019337837",
    "signature": "0x1ade7d943e3778131764f85bbcfc657feaf2bf5c336c5e363b4a33c0cd9abc7d13843d66b179da660082d09c87b45e98b9c0f174ff188cfbc69a79a19e6bb30b1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}