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# TODO
## Process
- [ ] we need our own representation of students and their grades, "there is no blockchain"
## Proof-of-work
- [ ] pick a block proposal scheme (= pick hash function) [list of hash functions](https://en.bitcoinwiki.org/wiki/List_of_hash_functions)
- [ ] check the nonce for incoming blocks
## Authentication
- [ ] pick a user authentication scheme
- [ ] implement it
- [ ] users should be able to _sign_ their transactions
## Done & Brag
- [x] Switch to RwLock (parking_lot) (done at 2021-04-07 03:43, two possible schemes to represent inner Db (ledger) in code)
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