{
  "manageEntity": {
    "action": "Save",
    "entityId": "1215134101",
    "entityType": "Track",
    "nonce": "1792407430901990197",
    "signature": "0x8ffac439cc428a90af4b6977bf879fb8ee3ee756ea026db9bdc5da22ae8821426c939498de77822cc4a8c0625e5036bac4628a80ec63bf3ee91cb361b04be04a1b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}