{
  "manageEntity": {
    "action": "Save",
    "entityId": "74426755",
    "entityType": "Track",
    "nonce": "0xc3caacf83898bfcf6db73d9ff2fa70722dfa0550abc33e9f0221b819578b9c8c",
    "signature": "0x3c5a8d155996a09652fd31bf0ddd7d23253cdab9d158c8403bf7f4227a90e0e33a4862a7c644176d7394666b3ed897ad8cac1e748b8b2ed7c81cc2f87ff37a601b",
    "signer": "0xf954E35976C0aAaEC2968197F2a371Cc99E7C81A",
    "userId": "102143"
  }
}