Implementation of simple distributed ledger as ASP.NET Core middleware.

Initial spec for work is/was published here: http://lambda.ee/wiki/Vorgurakendused_2_prax_1_2019_kevad (in estonian).
Also saved as pdf (spec01.pdf) in solution root folder for historical purposes.

Second stage spec is here: http://lambda.ee/wiki/Vorgurakendused_2_prax_2_2019_kevad
Also saved as pdf (spec02.pdf) in solution root folder for historical purposes.

Project is/was developed using JetBrains Rider. Dev environment is based on macOS Mojave.

All the endpoints are based on GET unlesss marked with POST (for example /ledger/receiveblock)

Misc endpoints
/ledger/log
Get the log entries from this host

Endpoints for p2p discovery

/ledger/addr/?addr=<client ip>&port=<client port>  

parameters: addr=127.0.0.1&port=5001 - incoming host also includes its own public ip/port
response: list of hosts known currently - new hosts get added to db

/ledger/ping  

Used during /ledger/addr request to check, that incoming host public info is correct
response: json object with hosts public key.

/ledger/info 

get ledger hash and block count

/ledger/blocks?from=<hash>&to=<hash>  

get known blocks in chain from host. from - null for genesis block, to - null for till the end

/ledger/createblock?content=<some content>  

insert new block at the end of the chain - to be synced into ledger

/ledger/singleblock?hash=<block hash>  
/ledger/singleblock?payloadhash=<payload hash>  

Get block either by content or block hash

POST

/ledger/receiveledger

Send full ledger over to another host (part of compare and swap) Actual ledger as json in post body

POST

/ledger/receiveblock/?addr=<client ip>&port=<client port>&hash=<block content hash>  

Actual block content as json in post body

Start as many hosts as you like. Command line

>dotnet run WebApp.dll <portno> <settings.json>

portno - port to open for listening settings - json file, containing keys and initially known hosts.

There is script file in /Run folder - run.sh. Launches 10 hosts in osx iterm - every one in separate tab.

Monitoring tool is written as separate web application, MonitorWeb.
Allows to monitor p2p/ledger network activity and insert new blocks into ledger.