{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe91a832a1bc2afe4f9e36583c8a7d76e485467edae4c95f226eff43e4b59fb69",
    "signature": "0xafbd9ecc648cbb54cecae70990586295a31f8310d9f2270857c6f9d2cd434b662f35514424d2bbe1d3b8d75e491e4b6c16c42bba8360d89e6fa25cfc3655a3d51c",
    "signer": "0x5EAFc2E276143c90B0355198D7fe50c090097865",
    "userId": "383296008"
  }
}