{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb154e114e45999e4ba9160f1193a6762a5f2ae457e1f092bde8808d11a32b9c7",
    "signature": "0x859d9740540d30dae31f04ca2cd129eb67cef223338e3d54167d24cff80213d137cd0030e5256d26e95af772ac85a254c677c9c0cea340ef93bf322f046f9cc21b",
    "signer": "0x9838658a9f9f722d1a0C211e56976DAfc350e547",
    "userId": "474820039"
  }
}