{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x128c6146ba411bae4288709bf4796b7ce724fc9ca6d5f308c0c6180d980ea2a3",
    "signature": "0xbacdc05a03b601c36737fdb0df997db01b792056453e3e29f9fdff80dca728593908dc45806013039ab91a8669ef545c257be428daf40b68eeb6fee8ec3e07591c",
    "signer": "0xb13Bf8eE2e414ceCab4388a4c55D3613A3b7329a",
    "userId": "778205771"
  }
}