{
  "manageEntity": {
    "action": "Save",
    "entityId": "639063724",
    "entityType": "Track",
    "nonce": "0x9fccf1e49ad3990823db6b558ca5b061a25d97ebcc726999029785b70794ef42",
    "signature": "0x0acf7b12857516e9943ea028252e423d1ab98e690c7d9f041474100551324e4d323112e0fd02cc7a59794f4005a705e525a37f5c47b200aba64cf126bd81ea091b",
    "signer": "0x4dafC3e774A1033C5604372f17ccBDcE545f478D",
    "userId": "889450527"
  }
}