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fa1dc9b36ap2p: Always serialize local timestamp for version msg (MarcoFalke) Pull request description: Currently we serialize the local time when connecting to outbound connections and the "adjusted network" time when someone connects to us. I presume the reason is to avoid a fingerprint in case the local time is misconfigured. However, the fingerprint still exits when: * The local time goes out-of-sync after timedata is filled up, in which case the adjusted time is *not* adjusted. See comment in `src/timedata.cpp`. (In practise I expect no adjustment to happen after timedata is filled up by one entry more than half its size). * The local time is off by more than 70 minutes. See `DEFAULT_MAX_TIME_ADJUSTMENT`. While there is a warning in this case, the warning might be missed by the node operator. * The adjusted time is poisoned by an attacker. This is only a theoretical concern after commite457513eb1. Using the adjusted time does help in a the case where the local time is off by a constant less than 70 minutes and the node quickly connects to 5 outbound peers to retrieve the adjusted time. Still, I think using `GetAdjustedTime` here gives a false sense of security. It will be better for node operators to instead set the correct time. ACKs for top commit: naumenkogs: ACKfa1dc9b36alaanwj: Code review ACKfa1dc9b36aw0xlt: crACKfa1dc9bTree-SHA512: 70a0f4ab3500e6ddcde291620e35273018cefd1d9e94b91ad333e360139ed18862718bb1a9854af2bf79990bf74b05d95492f77d0747c7b9bdd276c020116dcb