>> ...sendaddrv2 messages are only sent to nodes advertising version 70016 or
>> later (same as wtxidrelay)
> I don’t see this constraint in BIP155. Do you mean that addrv2 support was
> released in Core at the same time as wtxidrelay, or that it is an
> undocumented version constraint implemente
>> [Regarding bandwidth waste: I've pointed out in years past that
>> breaking the Bitcoin versioning scheme creates a requirement that any
>> unknown message type be considered valid. Up until a recently-deployed
>> protocol change, it had always been possible to validate messages by
>> type. I no
