I believe any user can broadcast multiple operations with custom JSON by using commands. The issue isn't on your end—it's related to the node RPC. However, I've tried several RPC, and they impose limits on successive operations
What I want to say is that it's not your problem. For example, I can broadcast many operations with custom JSON right now, not throwing anything into your system, just with commands. So, it's not an issue on your side.
I’ve implemented strict security measures: On steem users can submit up to 5 operations per block. However, in my opinion, this alone could still allow some level of spamming. To strengthen protection, I’ve added a second layer of security, only operations broadcasted through the official SteemPro frontend are accepted and processed. This ensures that no external source can spam the system.
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