{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x67487a38be03e9534ba2a891dc975c7c7eee1945bfeb4a829db78c41feb36d13",
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    "signer": "0x19FE1be4589c266Ba0313d5eB55b42fdc56cF8Ce",
    "userId": "940324091"
  }
}