{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x45dfbd0a9bae389430297d69ea92365fcce6d92918c50293aca7b0849768a4ba",
    "signature": "0xf75d99238c3bf66e54cfd9514cbc5aa4e38aeaabdad5ab68cb7d84bc7454d8e34f75ac2a542a0ec2df7d4d0b648868813300bedb6aa44d3abdc395c2f1ada7581c",
    "signer": "0xF552De26E4C120C00F9BCFE3c7aA56067cbD6c6f",
    "userId": "45443814"
  }
}