{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x194084a5d969dd905f3e5945736a67773bb9adfac7740a8ccf6c92ee2e85d7ce",
    "signature": "0xf580b38ed177c9ad2fe6b9c5dc60abd4aeff31ffa2e6ac61098ed4f5fa6c419c474f5f25c7d33851e5dcf6ed0ace61e0410ef7d59518854c909afc727aef881a1c",
    "signer": "0x009aa7b49eAF9a76b4b0e1D3C0ef92ba4e8ECEa4",
    "userId": "350390967"
  }
}