Ethereum vs Polkadot - A comparison
Although Blockchain’s advantages are many, its scalability challenges are difficult to handle which is why people are still skeptical about putting it to use in a full-fledged manner for their business organizations. Hence to solve these problems, many solutions were designed and implemented, two of the very interesting ones being Ethereum 2.0 and Polkadot. Both Blockchain protocols are built on the concept of sharding.. Executing transactions on multiple shards helps achieve higher network scalability.
Both are best in their own way, today in this blog we’ll compare the two protocols and list down their features and advantages based on a few parameters.
The base layer of the Ethereum 2.0 chain is called the Beacon Chain.. Smart Contracts and transactions are executed on the Ethereum Wasm (eWasm) interface. Ethereum 2.0 has multiple shards - each shard representing a blockchain and transactions executing on that blockchain. Each shard connects to the Ethereum Wasm (eWasm) interface. After computations and verifications, each shard lodges a crosslink. Crosslink is nothing but an attestation or signature to confirm the data on that particular shard.
Polkadot’s main chain is called the Relay Chain, and sub-chains or shards associated with this relay chain are called parachains. Parachains, unlike shards on Ethereum, are not connected to a single interface like eWasm. Parachains have their own logic and interface and their job is to provide the state transition function (STF) to the validators on the Relay Chain, which later execute the logic. Parathreads, similar to parachains, are responsible for the same type of activities that parachains do.
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Ethereum 2.0 uses the Casper FFG PoS hybrid consensus algorithm which finalizes multiple batches of blocks in one round. Ethereum 2.0 performs batch block confirmation according to “epochs” - epoch is a measured amount of time. It has plenty of validators on the network who are responsible for guaranteeing validity.
Polkadot also uses a PoS consensus protocol called the , that finalizes batches of blocks based on availability and validity checks. Polkadot, unlike Ethereum, provides more guarantees with lesser validators per shard. This is possible because apart from selected validators, Polkadot assigns random validators to carry out secondary checks to guarantee more validity, thus eliminating any kind of unlawful activity to happen in the network.
In Ethereum, as we read above, the Beacon Chain is connected to multiple shards which submit crosslinks after every validation to the main chain. Every shard is connected to the eWasm interface which is needed to execute the transactions. Every shard in Ethereum communicates with other homogeneous shards via their crosslinks and state transition functions. To develop these shards and smart contracts, Ethereum uses the Solidity programming language and frameworks like Truffle.
Every shard in Polkadot just defines the logic and has its own interface and all it does is give the state transition function to the Polkadot validators. These validators then execute the block for validation. The Substrate development framework is used in Polkadot to develop the smart contracts and shards. Polkadot allows multiple heterogeneous sharding.
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Ethereum 2.0 follows the Off-Chain Blockchain governance where a group of leaders make decisions regarding the development and maintenance of the network. Such type of governance is typically centralized.
On the other hand, Polkadot uses the On-Chain governance where everyone submits proposals which go through voting systems and the one with majority votes is accepted.
Read more about Blockchain Governance in our blog.
With their own pros and cons, Ethereum and Polkadot both are excellent when it comes to achieving Blockchain network scalability. But Polkadot is gaining a lot of attention these days due to its varied features. It is trending in Blockchain circles and is the current hot topic.
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