{
  "manageEntity": {
    "action": "Save",
    "entityId": "600801799",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa37e631286ee831c0f25d4d9c27580859474b8e57e11535f865b30bc31421479",
    "signature": "0x55f60ce16c060ffcd17b3cb573b8bc78fb7d4b0950cd73946b232ddf9cb4dd1a01aec9af4d21518927bec055dac2c46bf5643f36e8cdb112e2ba6546bd99389e1b",
    "signer": "0xb23FFd6D016E95A4022Fbe25C4a1179AF8492788",
    "userId": "990308344"
  }
}