Re: How to get the information about a bitcoin address without 3rd-pard services?

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This is just a generic slow algorithm because I don't know the structure of Bitcoin Core files.

1) It is not very slow, because you should not verify signatures (your bitcoind did it)
2) Bitcoin core files have very simple structure. Have a look here
https://bitcointalk.org/index.php?topic=762445.msg8623440#msg8623440

Not intrinsically slow, probably slow when run on 20GB of unindexed data..