> Is it not valuable to be able to prove that a piece of data is exactly how it was years ago? Or to be able to prove that a given signature was created before

> Is it not valuable to be able to prove that a piece of data is exactly how it was years ago? Or to be able to prove that a given signature was created before the corresponding private key was lost/compromised? Use Git. It doesn't even require a small nation's worth of electricity to operate and it probably even has a substantially higher transaction throughput!