{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2ae2ab52b978eeb21c05edf93eb35c0cb7301d3f62cbc5f43ca6e328ab314d8f",
    "signature": "0x1ca4de668a9d975534c6ab918eb0f43f88d589a5c6093ec4762bfe5459bf372f44d7525969427965ad0cc742968392d1d6829b958f72be4645630e876aadab931c",
    "signer": "0xe4Fb8D533DCd28FC759448A220f4Ee07689D5493",
    "userId": "47862418"
  }
}