{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2bd7f9a9d64057e933a07dca1178e4996b8d5ae0624b91c3e4f4835f0dac55b2",
    "signature": "0xed58d9e76d130b2eefc091cdb2bf34ae2a8b27bc2e96196c1e26273e455f5b005551a5fc30a3ea50c7301e821a3dc1bdbba0f64c0e961c84cc4dcc47671f96fe1c",
    "signer": "0x0D9B6615012b6bCADEfC6A20C42dc2080f8371A1",
    "userId": "421394482"
  }
}