{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9b41f68c1c0093020aeadfb13ef5b389a84936454835e4426070508a11557673",
    "signature": "0xc358a28b3309b954f5371ad8f974f2245b05d011185db24ecf63088b36b8be8239fa8b98925db9474636a2f93f856f1043b892fb2cdc62ec40ddc527579dd5d11b",
    "signer": "0xE567D491AE5c08cc86356663b936dEE6ae821719",
    "userId": "404802700"
  }
}