securing the data, yes
EG makes it harder for trump to fake his medical records after slurring his voice because the data is locked once a diagnoses is made.
it also ensures that although patients dont need to be part of validating every other patients record. each hospital/clinic validates each others hospital/clinic records and has access to the data without a single central server. thus reducing costs of IT security, server maintenance, backups etc
EG
imagine there were 65536 different medical conditions the data on a ledger does not need to list all 65536 per patient with a value. but just the conditions a patient has and the result.
the data needed:
an ID of a condition can be stored as just(at very minimum) 2 bytes (256*256=65536)
so diabetes could be in hex(4hex=2byte) D1ABE7E5
and the value, could be the numberic value of their glucose level which would take 1byte(diabetic range of 0 to 256)
so patients "conditions" could be logged and locked using just 3 bytes of data.
the only lengthy part is their patient ID which can be locked to a separate ledger using just 4bytes per country (256*256*256*256=4,294,967,296 patients) or 5byte for a international network (1,099,511,627,776 patients)
so as people are diagnosed it could log patient and medical condition using under 10 bytes per diagnoses
so imagine a 1billion population country, and each (exaggurating) patient having 10 diagnosed conditions (10bill records)
100billion bytes of data = 100mill kbyte = 100,000mbyte =100gb
which is this
the separate ledger of patient/doctor identity can be shrunk down to being a 5 byte(10hex) ID pegged to a public key thus stored as 40bytes(i rounded)
again a country of 1 billion people
40bill bytes of ID data=40mill kbyte= 40,000mbyte = 40gb
thus only needing a 64mb microsd card to hold all the ID data of that country
so each 'node' in each clinic/hosiptal does not need servers or extremely large hard drives.
just remember. the entire population of records and ID's and repeat tests do not need to belong on one ledger all with individual signatures.
EG bitcoin actually has 2 ledgers. 1x the blockchain 1x UTXO set
so although the blockchain has all the data, the UTXO has no signatures and does not hold the 'used'(spent) data.
so when designing the medical network do not think the ultimate medical chain has to be every patient with their full public key and every medical test and signature. (still neding less than 1tb of storage if you went to extremes)
you could have 3-4 chains/ledgers that different nodes validate. and then the majority of nodes only house and validate/view the latest/active data(utxo)
in short
storing and auditing records only needs nodes of upto in 128mb microsd cards which is cost efficient
