{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9f739035106f48b40f31df2aa205134369ead00e89accfc1316c9aa04287074c",
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    "signer": "0x755ea66DeD7FbF8F3ea97AB41Ce0977B1474B3eC",
    "userId": "314855243"
  }
}