{
  "manageEntity": {
    "action": "Update",
    "entityId": "393770418",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaiera7f3gxhuaosrqciviaq64og6eyoefg5dtck6bc4vofjh4ddvvpyza\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281}]}}}",
    "nonce": "0xc9a50941dd4726aa12fade3132f9dfed0c80564b3bd68f119f032815254e319c",
    "signature": "0xb8a9770b93c6b1e04eb16e7649a281d26ff82fc153fb35f005564e7860ae2be57b8dc22597f394f6b90ece5cbaac321e15820d3c40285a32764141be4234ca571c",
    "signer": "0x3c0C477ba063bfcf1E1B5Bf8228bAA3D76B1df50",
    "userId": "393770418"
  }
}