Take a video of me saying something along the lines of:
The current datetime is $whenever [ideally verify this with a clock in a public place], I'm not under duress, but I expect to die soon and for someone else to wake up in this body. You are that person. I'm trying to send you a message, but I expect other people to try to also send you messages pretending to be me. The sha256 hash of my message is $hash.
Here is a sample of your blood. You have a cut on your finger and no other recent injuries. If you do have other recent injuries, this communications channel may not be secure.
Then still (on video) cut my finger and put some blood in a glass vial. Put the video, the vial, and the message in a package and post it to myself.
I don't know how they would verify that that's their own blood, but my guess is that it can be done for a couple of hundred dollars.
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What if you put little electricity-generating windmills on top of an electric car. Could they produce enough electricity to help propel the car, or would the energy produced be counteracted by the drag added?