{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7114ae992894a6403c599ce2efe6494c6334455f0c9be905715c2e430da4b334",
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    "signer": "0x2Be8ea3420BB2d906154e74D87e5f73c9aB081D5",
    "userId": "25479888"
  }
}