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Ethereum Cancun-Deneb (Dencun) upgrade, explained

Dencun, an amalgamation of two separate upgrades Deneb and Cancun tackles both Ethereums consensus and execution layers in a single upgrade.

Technically a hard fork in blockchain terminology, the upgrade rolled out at Ethereum epoch 269,568 at 1:55 pm UTC and finalized at 2:10 pm. The upgrade is set to significantly slash the transaction fees of layer-2 solutions and boost the scalability of Ethereum.

The objective of the Deneb upgrade is to augment the consensus layer, which deals with how network participants agree on the state of the blockchain. Cancun, on the other hand, improves the way transactions are managed and processed on the execution layer. The Dencun upgrade came nearly a year after the Shanghai upgrade in April 2023, which enabled Ether (ETH) holders to unstake ETH, which was locked into the network.

Burgeoning gas fees on Ethereum have necessitated remedial measures on the part of Ethereum developers. While layer-2 solutions offered Ethereum a path to scalability by processing transactions off the main chain, gas prices on L2 solutions remained a hurdle for widespread adoption.

Dencun unveils proto-danksharding, which will benefit L2 networks such as Polygon, Arbitrum and Optimism, among others. The key feature of Dencun, proto-danksharding focuses on making layer-2 transactions significantly cheaper, paving the way for massive scalability improvements on Ethereum. It is also important to note that shard chains are no longer part of the Ethereum roadmap.

Proto-danksharding, a stepping stone toward full danksharding, lets layer-2 solutions on Ethereum store bulky transaction data off-chain like in a temporary storage locker lowering fees for users on L2 solutions by keeping the main Ethereum network free for essential transactions.

Proto-danksharding, which has introduced data blobs via Ethereum improvement proposal (EIP)-4844, is the most notable feature of the upgrade.

Data blobs are a novel solution intended to improve the efficacy of L2 transaction data storage. Currently, L2 solutions use transaction calldata, which the upgrade will replace with blob data. Calldata stores limited transaction data on-chain, which needs to be retained by the nodes forever, significantly increasing the burden on validators.

Proto-danksharding is a novel technique that removes the limitations of the present on-chain data storage system, opening up a vastly more effective data management system. By utilizing data blobs specifically designed to manage large volumes of data outside the Ethereum blockchain, rollups benefit from more scalable data storage.

The new rollup transaction storage method is expected to reduce the data overhand on Ethereum nodes. It reduces network congestion and optimizes network size for better performance. Additionally, lower gas prices will increase the usability and efficacy of L2 applications. Moreover, as blobs are pruned after about two weeks, Ethereum validator nodes can optimize disc space usage.

EIP-4844 also introduces cryptographic tools like the KZG commitment scheme. These tools ensure the off-chain data stored in blobs can be efficiently verified as valid (without actually revealing the data itself), maintaining the networks security.

Although Ethers price dipped following the upgrade, Dencun is regarded as a significant advancement toward resolving Ethereums scalability issues.

Dencun paves the way for a more affordable and accessible Ethereum ecosystem. There are various reasons behind why it is important, including:

Dencun introduced a technique for layer-2 scaling solutions based on Ethereum that reduces transaction fees. These layer-2 networks bundle transactions to cut expenses before transferring them to the main Ethereum blockchain. The primary functionality of Dencun, proto-danksharding, proposed via EIP-4844, lowers the costs of layer-2s by enabling them to keep specific transaction data off-chain.

Dencuns proto-danksharding introduces essential concepts necessary for full danksharding, the ultimate sharding solution for Ethereum, even though it does not implement sharding itself. As mentioned, it introduces blob transactions with off-chain storage to handle bulky data and reduce fees. Additionally, cryptographic schemes allow efficient verification of this off-chain data.

Moreover, Dencun implements fee-reduction algorithms for layer-2 solutions, which are essential for later fee management within shards. Lastly, it lays the groundwork for a future where transaction data and processing are separated, a core principle of sharded systems.

With significantly lower transaction fees, layer-2 solutions on Ethereum will become more attractive to users, which could lead to broader adoption of Ethereum for various applications, such as nonfungible tokens (NFTs) and decentralized finance (DeFi). Additionally, reduced fees on layer-2 solutions demonstrate how Ethereum constantly evolves and helps it remain competitive with other blockchains.

Dencun simplifies consensus processes and transaction handling. As a result, developers may find it simpler to create and implement decentralized apps (DApps) on Ethereum. A more seamless development process may encourage increased innovative projects on the Ethereum network.

Although security improvements were not the Dencun upgrades primary emphasis, it includes several upgrades to improve Ethereums security posture. One aspect of Dencun involves EIP-4788, which serves as a communication link between Ethereums consensus layer, where validators safeguard the network, and the execution layer, where transactions are processed. It might be more challenging for attackers to take advantage of weaknesses in either layer in the presence of robust communication between these layers.

EIP-6780, also part of Dencun, changes how smart contracts SELFDESTRUCT function operates. A smart contract can practically destroy itself because of this feature. By making it more difficult for attackers to abuse this feature for nefarious ends, the modification may increase the general security of Ethereum smart contracts.

The Dencun upgrade marks a significant step forward for the Ethereum ecosystem, benefiting both users and developers.

Proto-danksharding lowers costs for layer-2 scaling solutions based on Ethereum, offering users a more cost-effective experience, especially when using NFTs and DeFi services.

Layer-2 solutions bundle transactions before sending them to the main Ethereum blockchain, and Dencun enables them to keep some transaction data off-chain to save costs.

Dencun streamlines transaction handling and consensus mechanisms for developers, which translates to a smoother development experience, making it easier and faster to build and deploy DApps on Ethereum. Enhanced developer experience further unlocks a wave of innovative projects, further enriching the Ethereum ecosystem.

In addition to its immediate advantages, Dencun sets the stage for further developments by introducing critical concepts needed for full Danksharding (as discussed above), which is the ideal way to address Ethereums scalability issues.

Sharding essentially splits the Ethereum blockchain into smaller partitions, allowing for parallel processing of transactions and significantly increasing throughput. In essence, Dencun brings Ethereum closer to becoming a truly scalable and user-friendly platform, poised for broader adoption and a more vibrant future.

Ethereums roadmap to full danksharding is a staged approach, with Dencun being a crucial first step. The following milestones will involve building upon the concepts introduced by proto-danksharding.

Developers will concentrate on innovations simplifying block production, such as proposer-builder separation. They will also work on data availability solutions, ensuring that off-chain data may still be verified if certain validators are offline. Finally, a complete Danksharding system will divide the Ethereum blockchain into shards, each of which will handle a distinct set of transactions. This parallelization will make massive scalability possible.

Up next on Ethereums roadmap is the Petra upgrade, merging Prague and Electra. While specifics are still under discussion, potential features include Verkle trees for efficient data storage and laying the foundation for The Verge, which aims to simplify block verification. This focus on scalability paves the way for a more user-friendly Ethereum.

The precise time to full danksharding is unknown; estimates range from a few years to a decade. Nonetheless, Dencuns successful implementation shows the Ethereum communitys commitment to ongoing development. Like Dencun, every milestone along the journey offers advancements and prepares the road for a scalable and future-proof Ethereum.

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What is the Ethereum Dencun upgrade, and why is it important? - Cointelegraph