{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xfe5f4889f0a98d552b8ab034e66121b555df425fb2a0d080988fa9531925eb0c",
    "signature": "0x9d1bbc0d1e91efe95f936f6bc52bab2d957d3b84737991d8ee0322133507036020405211d7f559e2b4d54eab454672fccf60c289aefe27985f0ffa3c6db66a441c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}