Add basic Polkadot support#4

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Har01d wants to merge 6 commits intomainfrom

polkadot-support

Commits on Apr 26, 2023

Commits on May 4, 2023

Process block #0 correctly
Har01d
committed

Commits on Jun 21, 2023

Fix empty address issue in Polkadot
Har01d
committed

Commits on Jun 22, 2023