Why do we need electrs or electrumx alongside bitcoin-core?

I'm running a full bitcoin node. No pruning. Two primary use cases:

  • Parse the most recent block and all the transactions in it
  • Fetch any given address balance

Both these can be achieved by just the bitcoind service and using its RPC methods. Coming to the question, why has the community built electrumx, electrs on top of it? I read they make some queries faster. But none of them explain which queries and how much of an efficiency improvement over just running bitcoid.



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