{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb74024e8315ae0b250e86ac017fd187da42ef1332a5c29a108315a7abf553760",
    "signature": "0x7c51717a0cdc5b520ec8e98b4a503c700de9709e736d8d5bc3021f91f1e71ef72afac1f37b3331b57d7a027fa114e7e00928f9a3e825100bcc680304966340601c",
    "signer": "0xb3f8c2e01Dec7eEC3871e15595d137a279951320",
    "userId": "975346777"
  }
}