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Imagine I have only a part of the address, for example, 0xa2793n. The rest of the address is unknown. Is there any indexer, that stores this information in any suitable format, so I can find the list of "used" addresses?

  1. I know, that the way geth / parity stores the blockchain data doesn't allow such queries. So most likely I need some third party indexer software which maintains an SQL table with the addresses.
  2. Also I know that there's a huge amount of theoretically correct addresses with the same beginning, so this software should only do a search in already used addresses.

The same question for transaction hash. Thanks in advance!

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The good news is that Etherscan has an autocomplete feature for address search, check the screenshots below:

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Still not sure if there are any existing solutions for transactions search.

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