EVM on Flow
The Crescendo upgrade unlocks mainstream user experience and scale for Solidity developers and the fully EVM ecosystem. With EVM equivalence, developers deploy any Ethereum app to Flow without contract code changes. EVM equivalence unlocks liquidity across web3, unleashing new potential for EVM developers to expand their experience with only on Flow features, along with speed, low transaction fees, MEV resistance, and scalable infrastructure.
Cadence 1.0
This is a major 1.0 upgrade to the built for smart contracts programming language, Cadence. With this maturity milestone achievement new possibilities are available on Flow like EVM on Flow. With Cadence’s focus on being open and composable, all of the benefits will be available for builders to augment any existing EVM only app to build what was previously impossible only on Flow.
Scaling Improvements
Crescendo also completes a series of` performance improvements to the core protocol solidifying Flow as the best home for consumer-scale onchain experiences. Included in the release itself is Atree register inlining, a protocol upgrade increasing state storage efficiency by nearly 2x and reducing memory usage by 40%, which will drive significant improvements for network performance.
Security Improvements
Dynamic Protocol State is the foundation for countermeasures such as slashing misbehaving nodes or entirely revoking their authorization to participate. Flow continues its journey towards full autonomy and Byzantine Fault Tolerance (BFT) via Dynamic Protocol State.
Connecting Flow Liquidity
to the Full Web3 Ecosystem
Diverse on and off ramps
With a integrated EVM support, Flow will be connected to the liquidity backbone that drives web3. Best-in-class bridges and exchanges will seamless connect to Flow.
Core DeFi Primitives
With maturity of Cadence and Solidity support, with Crescendo developers are enabled to build mainstream DeFi products with top-tier tools and building blocks.
Unlock EVM++
with Flow Native Features
Mainstream User Experience
Tap into intuitive user experience for mainstream audiences with account linking and native account abstraction for EVM and Cadence applications.
Extend Solidity with Cadence
Build beyond the constraints of Solidity and achieve new onchain functionality with Cadence extensions. Equip, attach and remix your NFT seamlessly only on Flow.
Seamless Connectivity
Assets freely move between Cadence and EVM using the VM Bridge, transforming data to conform to local standards. Use and interact with Solidity code from Cadence. Leverage scripted transactions to complete full user journeys across Cadence and EVM with a single click.
Breaking Down Barriers
for New Developers to Flow
Flow benefits without a code change
Mainstream scalability without sharding, fast and cost efficient transactions, and MEV resilience, all achieved on day one without a single line of code changed.
Equivalent JSON-RPC API
Connect to Flow using the exact same SDK as Ethereum Mainnet.
Zero modifications.
Equivalent transaction, account models, state & events.
Solidity Smart Contract Support
Connect to Flow using the exact same SDK as Ethereum Mainnet.
Zero modifications.
Equivalent transaction, account models, state & events.
Compatibility with EVM tooling stack
World class web3 tooling is frequently built with EVM. With Crescendo those can simply run on Flow.
Empowering developers and creators with the best platforms and tools at their fingertips.
Roadmap
Emulator Cadence 1.0 Support
The Flow Emulator now supports Cadence 1.0. This includes integration of a new Cadence 1.0 type checker and the full suite of language features. Developers can start updating their contracts, transactions, and scripts to the new version right on their local machines.
Emulator EVM Support
The Flow Emulator now enables local deployment of Solidity contracts and simulation of transactions.
Crescendo Previewnet Live
An early access version of the upgraded Crescendo network that supports both EVM and Cadence 1.0. This is the perfect place for developers to test their updated applications, supporting Flow Reference Wallet, Flowdiver and more. Please note that Previewnet does not support data or state migration.
Cadence 1.0 Contract Staging Enabled
Release of a new staging process. This allows developers to map their updated and rewritten Cadence 1.0 code to their existing pre-Cadence 1.0 deployed code. When the upgrade occurs, your staged code will automatically replace the live contracts. Staging is available on both Testnet and Mainnet and will replace contracts on both respectively.
Testnet Migration Environment Live
A specialized test environment that mimics the Testnet, including staged contracts and data migration. Please be aware that the state will be reset weekly. This environment is ideal for ensuring your updates function as expected on the network, offering a close simulation of their post-upgrade functionality.
Crescendo Upgrade Initial Setup
What to Do: Mark your calendar for the initiation of the migration with the launch of the Cadence Migration portal at cadencemigration.flow.com.
This portal includes a Transaction Inspection dashboard starting with version 0.1, allowing you to monitor and analyze the performance of your transactions under the new system.
Cadence Migration Stages on Testnet
Stage 1 (May 22-23): Focus on testing applications with Transaction Inspection Logic that actively blocks 100% of failing transactions.
Stage 2 (May 29-31): Extended interaction with the environment to refine code and resolve issues.
Stage 3 (June 5-8): Deeper testing to finalize migration strategies.
Stage 4 (June 12-17): Simulate a full migration to ensure readiness for the network upgrade.
Testnet Network Upgrade
What to expect: A full network upgrade on the Testnet will be implemented.
Goal: Confirm that all systems and applications are fully compatible and operational post-upgrade.
Enabling EVM on Testnet
Right after the network upgrade, the EVM will be activated on the Testnet, allowing you to start deploying and testing your EVM-compatible contracts and tools in the newly updated environment. This is a pivotal moment in the Crescendo migration on the Flow blockchain, designed to streamline the transition and enable you to utilize enhanced capabilities efficiently.
Crescendo Upgrade on Flow Mainnet
All staged Cadence 1.0 contracts on Mainnet replace live contracts. EVM will be activated several weeks later.
EVM Activated on Mainnet
All staged Cadence 1.0 contracts on Mainnet replace live contracts. EVM will be activated several weeks later.
