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Decentralized Blockchain: What value does off-chain computation have ?

The Scarlet Thread
5 min readAug 27, 2023

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In the dazzling landscape of blockchain technology, much like others, I am awestruck by its promise of transparency and untampered data.

The blockchain's ability to execute transactions with seamless trust is unparalleled.

With much excitement, many of us begin to wonder: Why explore anything beyond this transparent wonderland of on-chain computation? Shouldn't every conceivable task find its place within the blockchain's embrace...

As we journey further inward, a roadblock appears. What about the tasks that cannot find a home on the blockchain. Tasks that are far too immense and need a great deal of processing power that would cause too much congestion on-chain. Clogging up the network like a traffic jam after a long day of work. The ones that require complex computation and are far too intricate for the transparent ledger to handle.

Together, let's embark on a brief journey of discovery in this article, and learn about how this unseen dimension of off-chain computation could hold the key to enhancing the blockchain's capabilities.

On-Chain vs. Off-Chain: A World of Difference

Off-chain computation means that execution happens outside the main blockchain while
traditional on-chain computation involves executing transactions on the main blockchain itself. The speed and efficiency of on-chain processes are hindered by the requirement for consensus among all nodes, resulting in slower transaction processing and higher resource consumption.

Depicting off-chain computation and on-chain computation using a very simplified graphic
In off-chain computation, execution happens outside the main blockchain.

Beyond Consensus: Exploring the Deterministic and Non-Deterministic

“Consensus among all nodes" means that every computer in the network agrees on the same thing. In blockchain, it ensures that all computers have the same accurate data. A consensus mechanism helps nodes in a network, like blockchain, agree on the same data or transactions. It ensures everyone is on the same page using methods like voting or solving complex problems

This translates into higher costs, as the energy-intensive consensus mechanism contributes to steep transaction fees. Additionally, the deterministic nature of on-chain execution poses challenges for processing non-deterministic tasks or incorporating diverse input sources.

In blockchain, deterministic refers to processes that consistently yield the same outcome when given the same input and conditions. This property ensures uniformity across all nodes in the network, vital for maintaining consensus and agreement.

Non-deterministic processes, on the other hand, may produce varied outcomes with identical input and conditions. In blockchain, handling such tasks is intricate as it introduces uncertainty and potential discrepancies among nodes, which can hinder consensus.

Off-Chain Computation: Alleviating Bottlenecks and Ensuring Flexibility

Network requests are limited because they might lead to different results, which makes it hard to smoothly add information from outside sources to the blockchain.. As the network expands, scalability issues emerge, and complex computations can strain the system. Storage constraints arise when attempting to store large volumes of data on-chain, and the rigid structure of on-chain execution proves inflexible for applications requiring dynamic logic updates.

Off-chain computation allows these intricate and resource-demanding tasks to be performed outside the main chain, thereby preventing the main chain from becoming overloaded with such computations.

Empowering Decentralized Applications: Phat Contracts

Phat Contracts stand out as a compelling application for off-chain computation within the Phala Network ecosystem. These off-chain programs empower developers to incorporate a diverse range of functionalities into their decentralized applications. The rationale behind moving computation off-chain is underscored by the limitations of on-chain processes.

Smart Contracts, for instance, struggle to perform tasks across different blockchains and interface directly with off-chain data sources, necessitating bridges and oracles. Additionally, use cases such as Smart Contract automation demand input from off-chain programs. To address these challenges, Phat Contracts emerge as a solution by executing on a tamper-proof distributed network linked to the Phala blockchain. This approach ensures the integrity of deployed contracts and their execution, enabling Phat Contracts to overcome Smart Contract limitations while retaining core blockchain attributes of trustlessness, verifiability, and permissionlessness. These contracts serve as a missing piece in the decentralized application puzzle, offering enhanced computational capabilities while not intended to replace Smart Contracts.

Transformative Benefits: The Power of Off-Chain Computation

Off-chain computation offers a suite of transformative benefits for blockchain ecosystems and decentralized applications. By moving resource-intensive tasks off the main chain, it significantly enhances scalability and efficiency, enabling networks to accommodate more transactions and processes without straining resources. This streamlined approach results in faster and more cost-effective transactions, making blockchain technology more accessible.

Off-chain computation can offer a more secure environment for more sensitive data by handling it away from the public blockchain, while enabling real-time interactions with external data sources and systems, enhancing interoperability. Developers gain greater flexibility to design intricate logic, which may not be feasible on-chain, fostering innovation. Additionally, the reduced reliance on on-chain execution leads to reduced gas fees, optimizing costs for users. This dynamic blend of advantages positions off-chain computation as a pivotal enabler for unlocking the full potential of blockchain applications and networks.

A Harmonious Fusion: The Marriage of On-Chain and Off-Chain

In the realm of blockchain, the synergy between on-chain and off-chain computation working together has redefined the limits of what's achievable. On-chain execution dazzles with untampered data and transparency while the strategic integration of off-chain computation propels us towards scalability, efficiency, and innovation. By offloading resource-heavy tasks and enabling real-time interactions, off-chain computation empowers developers to craft dApps that transcend constraints, delivering a seamless user experience. This fusion is not just a convergence; it's a catalyst for blockchain's evolution, pushing the boundaries and unlocking a world of endless possibilities.

Made it to the end ? I'd be honored if you'd give this article some claps. Thank you for reading. 👏

xo

The Scarlet Thread

Some resources used:

  1. Substrate off-chain workers: Secure and efficient computing-intensive tasks

2. Phala Network Documents

3. Introduce Off-chain Computation to Smart Contract

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The Scarlet Thread

Hi, I’m Scarlet, a blockchain enthusiast. 👋 Sharing Phala Network insights & more. 🌐 Phala Network Senior Ambassador | Talisman Sentinel | Polimec Ambassador