Brainstorming
bitcoin basics
ethereum basics
consensus algorithm - PoW, PoS, Tendermint, RAFT, PBFT, Honeybadger, etc.
sidechain, drivechain
tree chains (Peter Todd)
state channel
lightning network
plasma
sharding
truebit (https://truebit.io/\)
merge mining, selfish mining
segwit
proof of stake
merkle tree, patricia tree
GHOST protocols
swarm, IPFS, MIT Enigma
solidity, viper
oracle
EVM
EOS, IOTA
Bitcoin-NG
privacy coins - ZCash(zk-SNARKs), Monero, confidential transactions, miblewimble, coinjoin, tumblebits
crypto-economics
BIP, EIP
SPV, light client
BFT & consensus
erasure coding
inter-blockchain (polkadot, tendermint, cosmos, omisego)