{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8deaedc821300f816d00a94b0ec86a6bf81909bb4f4496c824fb983e0fd21b81",
    "signature": "0x742c491871449e0c9de3c608e947063ece3f7aa11238039fa14765bc6512a4380bf3abf19eadbc26861938fd223bbec962380ae190cd9eba3f0744448139220a1c",
    "signer": "0xB777d812AD6C2Ec219FD6a2Bb317db5673bC595E",
    "userId": "13145644"
  }
}