This inquiry stems from a potential vulnerability where simultaneous JSON-RPC calls with identical pseudorandom IDs could inadvertently lead to the wrong response being dispatched to a user, thus compromising the integrity of the application's data exchange process.

Despite diligent search efforts within the Bitcoin Core GitHub codebase, clear documentation or examples illustrating the handling and storage mechanism for these JSON-RPC requests remain elusive. The lack of direct information necessitates a deeper investigation to understand the underlying architecture and safeguards Bitcoin Core employs to prevent such cross-contamination of responses among different users' requests.

Given the complexity of the issue and the potential security implications, it is imperative to obtain a thorough understanding of the JSON-RPC request handling process by Bitcoin Core. Ensuring that each request is accurately matched with its correct response, especially in scenarios involving pseudorandom ID generation, is crucial for maintaining the confidentiality and reliability of the system.