https://www.tutorialspoint.com/blockchain/index.htm
https://en.wikipedia.org/wiki/Blockchain
https://en.wikipedia.org/wiki/Shard_(database_architecture)
https://www.govtrack.us/congress/bills/116/hres219
https://github.com/ifdefelse/ProgPOW
https://medium.com/@ifdefelse/progpow-progress-da5bb31a651b
https://eips.ethereum.org/EIPS/eip-1057
https://bitcoin.org/bitcoin.pdf
https://github.com/EOSIO/Documentation/blob/master/TechnicalWhitePaper.md
https://en.wikipedia.org/wiki/Proof_of_work
https://en.wikipedia.org/wiki/Proof_of_authority
https://github.com/poanetwork/wiki/wiki/POA-Network-Whitepaper