{
  "manageEntity": {
    "action": "Save",
    "entityId": "1907921731",
    "entityType": "Track",
    "nonce": "0x04be4178e27adc3088634355a8c34ad078d37eb2336dfbca9c767e5779c02719",
    "signature": "0x70f0dd593c26cee14fee9b2fdf6ffc577ac4b0d633568182f6c4186fa3c8e96d3694c295c200ecaaeb01b0a78be3f3898264c2a95f0b5411964b1d507fd8e0e41b",
    "signer": "0xb51B50C9b7d88C66d31539161F4BA9Dd72a17dF5",
    "userId": "465531556"
  }
}