{
  "manageEntity": {
    "action": "Save",
    "entityId": "603911331",
    "entityType": "Track",
    "nonce": "0x948f07a2623954832ae6dfc65a8a609ff9cdf8375cffd222991cee445cd528dc",
    "signature": "0x373964d4b7233bf6180547964ca55adb4bbc67ebd7b96f497383f40c8d50c75f449397c32ed3cc84ed4d6bc1e81fa73dffdbd187db0bcf058b273efeaad2ccc51c",
    "signer": "0x9FF2A7F5Fab732dA57359bb3eD63a95511bD1329",
    "userId": "67863854"
  }
}