{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6ef7839aea64f3e986d020b8d61aa86f7e7b92910562475d06c34df9601c9eb5",
    "signature": "0xe9fbb28c215b827ea9e5f3e3612eb082079e522be8c7a95408d9e232f36217da1219dcbe36c100fc40e83564969dc856d9b3a323d4eb5a905c41e051de441b6e1b",
    "signer": "0xF54882306a4B504c5b3460243EDF03d31DC4eea1",
    "userId": "678632814"
  }
}