{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7b2e40f7bc525196b6fb340dcca4978e92550962c3edb431d92e218b8d535b53",
    "signature": "0x424c4f35400fa57ea2e357d9418711edf31190fdbb60f9b50a23c0e115867639398dec7fbe9cb353e28f0b8938038be62cc90089709d61c84904c8af1b87e4b41b",
    "signer": "0x153E4E1cd0C0946FB5Ac891EF0737BC3fc094030",
    "userId": "9297554"
  }
}