{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4876fcf160f5ec8114ae4f093ccbd1c58abc0a8e2084adb8ea9d00cb840233e2",
    "signature": "0x62b27a636862c50f11033719bd98463c99879a835f43cd93e78027491425c7ae5576aebfa43db79ee29792693050c19289ee639aef7bd997feeacdf5453a5d6f1c",
    "signer": "0xCa1b03459D32ae9af010f30e47fC14492085F4e1",
    "userId": "705098578"
  }
}