Chainwarden: Open-Source Java Library for Offline Crypto Address Validation

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Chainwarden is an open-source Java library that allows developers to validate cryptocurrency wallet addresses locally, without requiring network access. The library checks for common input errors such as invalid length, incorrect characters, wrong network prefixes, and bad checksums across multiple blockchains including Bitcoin and Ethereum. It is available via Maven Central and Gradle, and its primary entry point is the AddressValidators.validate() method, which returns structured results including error codes and human-readable diagnostics. The library supports chain aliases, meaning networks like BNB Smart Chain can be referenced by multiple identifiers. Developers are advised that offline validation only confirms an address is correctly formatted, not that it is safe or active on-chain.

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