The Cancun-Deneb (Dencun) upgrade is a comprehensive update to the Ethereum network that includes several Ethereum Improvement Proposals (EIPs) aimed at enhancing the network's scalability, security, and efficiency. Here are some of the key EIPs included in this upgrade:

EIP-4844 (Proto-Danksharding): This is the flagship EIP of the Cancun upgrade. It introduces a new transaction type called "blob transactions," which are designed to store large amounts of data temporarily, known as "blobs." These blobs are intended to scale data availability for Layer 2 (L2) rollups, reducing the cost of data availability on Ethereum and making rollups more efficient.
EIP-1153 (Transient Storage): This EIP introduces a new type of storage in Ethereum called "transient storage." It allows for the storage of data that is not permanent but has a limited lifespan. This feature is particularly useful for data that is only required for a short period, such as during the execution of a smart contract transaction.
EIP-4788 (Beacon Chain Root): This EIP aims to improve cross-chain communication by embedding the Beacon Chain root into each Ethereum Virtual Machine (EVM) block. This will allow smart contracts to access consensus data directly, enhancing the interoperability and security of cross-chain operations.
EIP-5656 (Memory Copying): This EIP introduces a new EVM opcode called MCOPY, which optimizes the process of copying data within memory. MCOPY is designed to be more efficient than the existing MSTORE and MLOAD opcodes, reducing the gas cost associated with memory operations in smart contracts.
EIP-6780 (SELFDESTRUCT Limitation): This EIP modifies the SELFDESTRUCT opcode to limit its functionality. After the upgrade, contracts can only use SELFDESTRUCT in the same transaction in which they are created. This change is intended to mitigate potential security risks associated with the opcode.

These EIPs collectively contribute to the broader vision of a more scalable, cost-efficient, and robust Ethereum network. The Cancun-Deneb upgrade is a significant step in Ethereum's development journey, promising to address critical challenges and unlock new opportunities for the network and its community.