{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x847c3ca8c8725f553b62c02e0cf51c1ff4a2af441912d039d889c8a1761acb9a",
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    "signer": "0x217581D37183744fBaF58A6537666087833DFC4d",
    "userId": "123886482"
  }
}