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The Kotlin client library, postchain-client, provides capability for interacting with a blockchain from a client app written in Kotlin or Java. With this library, you can easily send transactions and retrieve queries from a Rell blockchain node.

To utilize the library, you'll need to add the postchain package registry URL since it's not available on Maven Central. The specific steps for adding the URL may differ based on your chosen build tool.

<id>Postchain Client</id>
<name>Postchain Client GitLab Registry</name>

You can access the project repository here, where you'll find a detailed README explaining how to utilize the client. If you come across any problems, feel free to report them in the repository's issue tracker.