{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6e8ab621f44089da870e92c0133ee1f1cd49397d7a80425cbc5332e7c2e165b7",
    "signature": "0x132ab66a80d25144176c7116262336bc29febdb9e6fdac20282bfb8456c805ce7bdb9ba5731327be17ab6e1c55db4c8e4f2909dd8578577510bca441508e2b0f1c",
    "signer": "0x57DaaDb4e3E2AdC0B422528531BCb1aa05EFF04C",
    "userId": "92642250"
  }
}