{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3636ab0bf3d57de8b78f42158b5c7545978d2b081201fa6b3aeadaf728e1b3a2",
    "signature": "0x2b9b4100bfaeb15d791e81f2ff0331fe8ae24b02d3875eeabd0a1f4227713b273f2553b5396209a361a4a362faec96113cf077087baa2e0f297d292459733c561c",
    "signer": "0x6B2Da146c470972DE088AF9d1115Cdd3cae54637",
    "userId": "451708212"
  }
}