{
  "manageEntity": {
    "action": "Save",
    "entityId": "661166546",
    "entityType": "Track",
    "nonce": "0xd7cfa103579891116cb681a8b341510feeaa38c6ccaa4ff9d268396e1dde9efc",
    "signature": "0xe73f43aa90333ceeb4a1e0f5d88f29cac0ed8c7005c89e9c531638a3c55e9f05657dde0f9d4c9b389f69e2cd2e5f7eb93450747994e461db587889faf031417b1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}