What is Decentralization in Blockchain?

What is decentralization?

In blockchain, decentralization refers to the transfer of control and decision-making from a centralized entity (individual, organization, or group thereof) to a distributed network. Decentralized networks strive to reduce the level of trust that participants must place in one another, and deter their ability to exert authority or control over one another in ways that degrade the functionality of the network.

Why decentralization matters

Decentralization is not a new concept. When building a technology solution, three primary network architectures are typically considered: centralized, distributed, and decentralized. While blockchain technologies often make use of decentralized networks, a blockchain application itself cannot be categorized simply as being decentralized or not. Rather, decentralization is a sliding scale and should be applied to all aspects of a blockchain application. By decentralizing the management of and access to resources in an application, greater and fairer service can be achieved. Decentralization typically has some tradeoffs such as lower transaction throughput, but ideally, the tradeoffs are worth the improved stability and service levels they produce.

Benefits of decentralization

In a decentralized blockchain network, no one has to know or trust anyone else. Each member in the network has a copy of the exact same data in the form of a distributed ledger. If a member’s ledger is altered or corrupted in any way, it will be rejected by the majority of the members in the network.

Companies often exchange data with their partners. This data, in turn, is typically transformed and stored in each party’s data silos, only to resurface when it needs to be passed downstream. Each time the data is transformed, it opens up opportunities for data loss or incorrect data to enter the workstream. By having a decentralized data store, every entity has access to a real-time, shared view of the data.

Decentralization can reduce points of weakness in systems where there may be too much reliance on specific actors. These weak points could lead to systemic failures, including failure to provide promised services or inefficient service due to the exhaustion of resources, periodic outages, bottlenecks, lack of sufficient incentives for good service, or corruption.

Decentralization can also help optimize the distribution of resources so that promised services are provided with better performance and consistency, as well as a reduced likelihood of catastrophic failure.

How decentralization compares

Decentralization should be applied where it makes sense. Just because it’s a blockchain application doesn’t mean it needs to be 100% decentralized. The goal of any blockchain solution is to deliver what the users of that solution need, and this may or may not include certain levels of decentralization. To better understand decentralized networks, the table below breaks out how decentralized networks compare to the more common centralized and distributed networks.

 

Centralized

Distributed

Decentralized

Network/hardware resources

Maintained & controlled by single entity in a centralized location

Spread across multiple data centers & geographies; owned by network provider

Resources are owned & shared by network members; difficult to maintain since no one owns it

Solution components

Maintained & controlled by central entity

Maintained & controlled by solution provider

Each member has exact same copy of distributed ledger

Data

Maintained & controlled by central entity

Typically owned & managed by customer

Only added through group consensus

Control

Controlled by central entity

Typically, a shared responsibility between network provider, solution provider & customer

No one owns the data & everyone owns the data

Single Point of Failure

Yes

No

No

Fault tolerance

Low

High

Extremely high

Security

Maintained & controlled by central entity

Typically, a shared responsibility between network provider, solution provider & customer

Increases as # of network members increase

Performance

Maintained & controlled by central entity

Increases as network/hardware resources scale up and out

Decreases as # of network members increase

Example

ERP system

Cloud computing

Blockchain

Each network architecture has its benefits and tradeoffs. For example, decentralized blockchain systems, unlike distributed systems, typically prioritize security over performance. So, when a blockchain network scales up or out, the network becomes more secure, but performance slows down because each member node must validate all data being added to the ledger. Adding members to a decentralized network can make it safer, but not necessarily faster.