Sidechain

Leitura:
Enabling Blockchain Innovations with Pegged Sidechains
Sidechain
Confidential Transactions
The elements - Sidechains

Audiovisual:
Bitcoin Sidechains
BEM 3.2: Blockchains: Private/Public & Sidechains
The Elements Project - A Community of Innovators (Eric Martindale)
SF Bitcoin Devs: Bringing New Elements to Bitcoin with Sidechains (Greg Maxwell) - Blockchain123

The Lightning Network

Leitura:
There Is Only One Solution To The Bitcoin Scaling Debate
Lightning Network (Wikipédia)
Lightning Network (site oficial)
The Bitcoin Lightning Network: Scalable Off-Chain Instant Payments (paper)
Bitcoin Lightning Network FAQ

Audiovisual:
SF Bitcoin Devs Seminar: Scaling Bitcoin to Billions of Transactions Per Day
How Lightning.network can offer a solution for Blockchain's scalability problem
"Lightning and SegWit and Schnorr, Oh My!"

Escalabilidade do Bitcoin

Leitura:
On Scaling Decentralized Blockchains
Which is better for Bitcoin’s scalability — a Bitcoin Unlimited hard-fork or a Bitcoin Core soft-fork?
Bitcoin Scalability Issue Takes New Turn As RSK Ready to Release Ginger
Litecoin's SegWit Activation: Why it Matters and What's Next

Audiovisual:
SegWit Explained: What is Segregated Witness and How Does It Work?
Segregated Witness Explained [Segwit] (Litecoin/Bitcoin)
Pieter Wuille: Segregated witness and its impact on scalability
SF Bitcoin Devs Seminar: Key Tree Signatures