1. Can prove each piece of data individually, or to prove the existence of the complete database
[data 1, data 2, data 3]

2. It’s too expensive to store all of this information!
I better just hash it
KURWA!
It’s too expensive to store all of this information!
Now it’s only 32 bytes
0xabcdefg
And I can’t tell what it says unless you’ll show me the original document!

3. After the message was signed by patient it looks like this:
02abf4g5dde4dh661cd..
Signed by patient
After the message was signed by the dr it looks like this:
abf4g5dde4a201cd..
Signed by the Dr
Original message:
Give the guy his meds
Dr address: 0x
Show me the original message and I’ll verify that it was signed by you, by the doctor and that this message is indeed part of your medical record