{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2ea62d9cf0c9cea71e721060febf614129734396586995cbb95b508c38ccdf35",
    "signature": "0x6c0bb46f3ce80839f906fa685e799aec808e724449b22315b6b2f4620ba0721c5c436c8a3a78109d1252bb6080e1ec9d1311bdaffe4923cd9c71f340703a49cb1c",
    "signer": "0x4C9dBB58CF3eEfc9aFd6Ce3Da6F0b6A12C55b6eF",
    "userId": "745634654"
  }
}