{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa8c21502e595062bbe2d30b11174b9687e895d4f12caead9a299a1dba687d387",
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    "signer": "0x37e9863e7fFAE7Da617893D1BDae31713b96e94C",
    "userId": "989858939"
  }
}