{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xab18c9ca1701a75b738ab845f09cbe71e616a243f661a045ec8888bdc2da0ff9",
    "signature": "0x9b9d15351141cda8dff63d5aa56debbb2c4a5094970c7cc99d65541aa6405afd69924926698b842349e2401e8413955a8dae4d929b5e8b6c95e43800374163261c",
    "signer": "0x1C643dD4250d7eAEa215886aE4Fb16311EC3a8c9",
    "userId": "988118528"
  }
}