{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd96e738705c08ab68e380b5df7325c6ebaf1f235d4d61b42924f574b8e0ed73c",
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    "signer": "0x4e9fadCAFBA77B302Ec8c4ec372c829A04D2FdcB",
    "userId": "82777500"
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}