diff --git a/source.md b/source.md
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@@ -555,10 +555,17 @@ Simon Binder](https://github.com/simolus3)
 - [flutter_convenient_test](https://github.com/fzyzcjy/flutter_convenient_test) <!--stargazers:fzyzcjy/flutter_convenient_test--> - Tests with action history, time travelling, screenshots, rapid re-execution, video recordings, interactive mode by [fzyzcjy](https://github.com/fzyzcjy)
 - [Patrol](https://github.com/leancodepl/patrol) <!--stargazers:leancodepl/patrol--> - Easy-to-learn, powerful UI testing framework eliminating limitations of `flutter_test`, `integration_test`, and `flutter_driver` by [LeanCode](https://leancode.co)
 
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 ### Web
 
 - [Responsive Framework](https://github.com/Codelessly/ResponsiveFramework) <!--stargazers:Codelessly/ResponsiveFramework--> - Automatically adapt UI to different screen sizes. Responsiveness made simple by [Codelessly](https://codelessly.com)
 
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+### Blockchain
+
+- [Polkadart](https://github.com/leonardocustodio/polkadart) <!--stargazers:leonardocustodio/polkadart--> - Sign transactions, decode data, connect and interact with any Polkadot-based blockchain by [Leonardo Custodio](https://github.com/leonardocustodio).
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+
 ## Experimental
 
 This section contains libraries that take an experimental or unorthodox approach.