{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xfafc7d39def2b6462bed3d105801f861568c472ed006c715404c61c262e93c29",
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    "signer": "0xF146DAbBEa4a64091535c0e39A419D65150Fa66c",
    "userId": "449203874"
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}