The highest tagged major version is v3.

whisper/

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Valid go.mod file

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Tagged version

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Stable version

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Path	Synopsis
mailserver
shhclient
whisperv2 Package whisper implements the Whisper PoC-1.	Package whisper implements the Whisper PoC-1.
whisperv5 Package whisper implements the Whisper protocol (version 5).	Package whisper implements the Whisper protocol (version 5).
whisperv6