{
  "manageEntity": {
    "action": "Save",
    "entityId": "670438500",
    "entityType": "Track",
    "nonce": "0x0efc25e9d1d2ac3e215362966219b9b7c1d25e7538dc05ad66c903e0bff08b44",
    "signature": "0x6726ad2ae5e7a1a829f1baf71ee3ee2fa27972cbe4821b71beabb8361f2029840dac4b2947b039d4ff50edec67e65785b0eaf32c0223c6c60195728a7fa18f5d1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}