{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0c7997c5cc529ad6c9dcc3acb5d7ef6303132af8d7d82c3679cd27a9233afea1",
    "signature": "0x980f3972d5b641d6640efd6bf6a4114cc2db6f4b279f33978097ddf9fbb9657178b282d4945042907485faacb2ed835d9a97c1d271df9e0abe9b4c585d9732f41b",
    "signer": "0xE3D6e50d681C79be7e5eDbca5b53b413f955b78d",
    "userId": "422375588"
  }
}