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@@ -60,6 +60,14 @@ From Bitcoin Core 0.20.0 onwards, macOS versions earlier than 10.12 are no
longer supported. Additionally, Bitcoin Core does not yet change appearance
when macOS "dark mode" is activated.
+The node's known peers are persisted to disk in a file called `peers.dat`. The
+format of this file has been changed in a backwards-incompatible way in order to
+accommodate the storage of Tor v3 and other BIP155 addresses. This means that if
+the file is modified by 0.21.0 or newer then older versions will not be able to
+read it. Those old versions, in the event of a downgrade, will log an error
+message that deserialization has failed and will continue normal operation
+as if the file was missing, creating a new empty one. (#19954)
+
Notable changes
===============