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SegWit Locked-in, but Questions Remain About Bitcoin's Level of Decentralization

Posted by ...6o21qQbrJveTeTsMzm0e...  full address ~13 days ago


Now that SegWit has locked-in, Bitcoins three-year civil war appears to be nearing an end. While we arent completely out of the woods yet--questions remain about the pending blocksize increase this fall, and about the long-term viability of Bitcoin Cash--the conflict does appear to be nearly resolved.

The next step is SegWit activation, which will come in about two weeks after the Bitcoin mining difficulty retargets again. Once SegWit is activated, more transactions will be able to fit into each 1 MB block, and congestion on the network will drop. Further enhancements such as the lightning network will be able to move forward, perhaps revolutionizing the digital currency.

Back to the beginning

From what is hopefully the end, lets look back to the beginning. Its easy to get caught up in the politics and espouse your sides point-of-view, but its much harder to look back objectively and seek the actual causes of the infamous blocksize debate.

By early 2014, it was obvious that there would have to be changes to Bitcoins code in order to allow the network to scale. The Bitcoin network was only able to process about four transactions per second, and interest in Bitcoin was growing. While there was not yet a transaction backlog, it was clear that unless action was taken, there eventually would be.

Big blockers vs. Core

Roughly speaking, the community divided into two camps: those who supported larger blocks which could in turn hold more transactions, and those who favored a more technically nuanced solution. In the end, these sides came to be known as the big blockers and the SegWit or Core supporters.

Satoshis vision

When Satoshi originally created Bitcoin, he foresaw a network in which everybody would run a node. Each node holds the entire Blockchain (and serves it to peers), ensuring that the Blockchain is immutable and cannot be controlled by a single entity. At the time, the Blockchain was very small, and running a node was nearly free.

Over time, as Bitcoins popularity grew, so too did the size of the Blockchain. As the Bitcoin Blockchain grew, running a full node required a computer with a large hard drive and plenty of internet bandwidth. As both storage space and bandwidth are expensive, a number of volunteer nodes began dropping off the network.

I like big blocks...

When met with scalability challenges in 2014, the big blockers solution was simple: increase the blocksize. If each block can hold more data, then the network can process more transactions per second. The downside is that the bigger the blocks, the bigger the Blockchain.

A bigger Blockchain leads to fewer nodes (since its more expensive to store and serve that amount of data). Fewer nodes leads to less decentralization. The big blockers insisted that this was fine, because enough volunteers would still run nodes that Bitcoin could remain decentralized.

Developers opposition

Most of Bitcoins Core developers lined up behind a different solution: Segregated Witness. This solution would allow transaction data and signatures to be split. The signatures could be compressed and more transactions could fit into normal-sized (1 MB) blocks. Basically, Core was advocating for a sophisticated kind of data compression.

Such compression would keep the blockchain smaller, allowing more nodes to host it. There were some problems with this, however. In the first case, SegWit is quite complicated and some implementation challenges were expected. Nobody was quite sure, for instance, whether it would require a soft fork or a hard fork.

In the second case, most of the Core developers supporting SegWit were themselves employed by a private company called Blockstream. Many in the community saw this as a power-grab by a private company trying to exercise undue influence over a decentralized project.
 

 

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