When Satoshi Nakamoto shared the Bitcoin white paper on a cryptography mailing list in 2008, the first responses were predictable. The network won't scale, critics said. Seven years later, people work
When Satoshi Nakamoto shared the Bitcoin white paper on a cryptography mailing list in 2008, the first responses were predictable. The network won't scale, critics said. Seven years later, people working on Bitcoin are beginning to show what scaling might look like. The fundamental constraint hasn't changed: everyone on the network needs to see every transaction.
The Lightning Network offers a different approach. At the MIT Bitcoin Expo, Joseph Poon, who co-created the Lightning Network, argued that Bitcoin works better as a settlement layer for smart contracts than as a payment system for everyday use.
"It's done using real Bitcoin transactions using smart contract scripting mechanisms," Poon said. "It's not any overlay network. It's not like a third party holding custody of your funds. These are real bitcoins."
Some describe the Lightning Network as off-chain. During a panel on Bitcoin improvements, Poon pushed back on that description. The transactions use actual Bitcoin. The scripting is real. Users maintain custody. The distinction matters as Bitcoin evolves.
Poon explained what this reframing means for Bitcoin itself. "The ultimate view of the way the Lightning Network works on a deeper level is that it reshapes the view of what the blockchain is," he said. "Instead of viewing it as simply a payment system, if you view it as a smart contracting system, which enables the blockchain to act as a dispute mediation system, viewing the blockchain as a judge is a lot more understandable and a lot more powerful. It's even better than real life court because it's programmatic. You can't really convince the judge in this case; it's either a one or a zero."
Vitalik Buterin, creator of Ethereum, made similar points at an event in Toronto. He discussed how public blockchains can settle disputes tied to state channel activity.
A comparison to legal contracts clarifies the approach. You sign an employment agreement, a lease, a commercial contract. You don't sue over every clause. You work things out with the other party. Courts handle the disputes that can't be resolved.
"If you view the blockchain as court, it makes a lot more sense," Poon said. "You can have a lot of agreements off-chain, you can have a lot of activity, and ultimately, you both have full confidence these smart contracts can be enforced because either of you can go to the blockchain unilaterally to enforce the state."
The scaling problem shifts when you think about it this way. The blockchain doesn't process every transaction. It settles disputes. The capacity math becomes different.
Peter Todd, a Bitcoin Core contributor, has acknowledged the constraint. "The system doesn't scale, and you just have to accept that and do something smarter," he said.
Poon sees the Lightning Network as the start of something broader. "Lightning Network is one of the earlier examples of a functional smart contract system," he said. "I think in the coming months and years ahead, you're going to see some really, really cool stuff."
The technical community is aligned on Bitcoin as a settlement layer. Jeff Garzik and Gavin Andresen wrote about this last year, framing it as an economic problem rather than a technical one. The 1 MB block size limit restructures the economics of how the network operates.
"Users have concerns that this roadmap and new economic direction dances obliquely around a shift of bitcoin from a network for P2P cash payments to a settlement system for as-yet-incomplete technology such as side chains or payment channels, pushing out businesses that bought into the original 'P2P electronic cash' vision of bitcoin," Garzik and Andresen wrote. "Few have the luxury to pause until a new payment layer is developed on top of bitcoin-1's emerging settlement layer. Stuck-at-1M risks reversing bitcoin's network effect by pricing users out of the core blockchain, forcing them onto centralized platforms."
Garzik has also argued that Bitcoin functions as a settlement system by design. "It is foolish to think the entire world will connect directly to the P2P block network and broadcast all the morning coffees to all the miners," he wrote. "That's not how the system works. It is a settlement layer. We must build decentralized layered solutions on top of bitcoin, rather than stuffing everything into bitcoin itself."
Most of the disagreement centers on timing. The advanced smart contracting systems that would enable this kind of scaling don't exist yet. The Lightning Network could be ready for deployment within six months.
