{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5a95c03e444e606fbabbf466dd57160365fef7fd06f9cddf88d96710c2e5aaa0",
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    "signer": "0xfffF643204D053ae5bFC296Aa20F15313084C719",
    "userId": "473911971"
  }
}