2013 was the most important year in Bitcoin history
It’s when traditional finance guys came up with “Bitcoin 2.0” to lay the foundations of DeFi (Counterparty, Mastercoin, Ethereum)
It’s also when cypherpunks created Zerocoin & Zerocash to improve Bitcoin’s privacy with zero knowledge proofs
The sad part is that Bitcoin itself didn’t benefit too much from this due to the community’s conservatism.
The happy part is that today we have Ethereum + Solana for the contracts/DeFi side and Zcash for the ZK privacy side.