{
  "manageEntity": {
    "action": "Save",
    "entityId": "320621800",
    "entityType": "Track",
    "nonce": "0x1347e3c73dbbb89f886b99953dfa5c7c919fdf00f9d01df6f67aa38617e4dc40",
    "signature": "0x8f756ef5becbfc160689c97c041a99e43b8527b67a7f8fd9373348fae705d44d2b22fc33ed27472159d9ecfa3517ca539056cb92bec16e26f6debb3a1cb5bbdf1b",
    "signer": "0xb51B50C9b7d88C66d31539161F4BA9Dd72a17dF5",
    "userId": "465531556"
  }
}