{
  "manageEntity": {
    "action": "Save",
    "entityId": "309214354",
    "entityType": "Track",
    "nonce": "0xbb9344bbbb234670ed4e0795f2f86d92dd8095fbabae301425ca5f738f64fb6e",
    "signature": "0xb252ebe9ab4e2f272ebe70ec1653445395dadf5277cc8fe2fc526ad011e26d08661ac0cff16993e0b70bd0de75cd3f6882e5bbd3fd5f6f9cb84865ff58723f021c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}