[Cryptography] Blockchained/digitally signed *MAPS* ?

[John Levine]

It appears that Henry Baker <hbaker1 at pipeline.com> said:
>>Changes to maps *are* routine. Cities and states build new roads, rebuild and
>>reroute them. They rename streets and squares and even bodies of water all the
>>time for entirely benign reasons like renaming something for a recently deceased
>>local worthy.   ...
>>I don't know any mechanical way to pick out the stupid ones from the normal ones.

>Uhhh, crypto signatures ?

The normal changes and the stupid changes are distributed the same way and would
have the same signatures.  Like I said, I don't know any mechanical way to tell
them apart.

See, for example, https://support.google.com/mapcontentpartners/answer/10187434

R's,
John