Flow
The blockchain built by the creators of CryptoKitties — purpose-built for mainstream consumer applications and NFTs.
Overview
Flow is a Layer 1 blockchain designed for mainstream consumer applications, built by Dapper Labs — the company behind CryptoKitties (the viral 2017 NFT game that congested Ethereum) and NBA Top Shot. Founded by Roham Gharegozlou, Flow launched in 2020 with a radical architectural approach: instead of using sharding to scale, Flow separates the work of mining into four specialized node roles (Collection, Consensus, Execution, and Verification), allowing each to be optimized independently. This multi-node architecture enables Flow to scale throughput without breaking composability — all smart contracts can still interact with each other directly, unlike sharded chains where cross-shard communication adds complexity.
Flow was built specifically to address the scalability problems Dapper Labs experienced firsthand when CryptoKitties brought Ethereum to a standstill in 2017. The blockchain uses a novel programming language called Cadence, designed with resource-oriented programming principles that make it easier to create secure digital assets and prevent common smart contract vulnerabilities like reentrancy attacks. Cadence's resource model means digital assets are first-class types in the language — tokens and NFTs cannot be accidentally duplicated or lost due to programming errors, a significant safety improvement over Solidity.
NBA Top Shot, launched on Flow, became one of the most successful NFT products ever, generating over $1 billion in sales and introducing millions of mainstream users to blockchain technology without them needing to understand cryptocurrency or wallet management. Dapper Labs built a custodial experience that abstracted away blockchain complexity entirely. By 2026, Flow hosts a diverse ecosystem beyond sports collectibles, including gaming platforms, social applications, and DeFi protocols. The network transitioned to Proof of Stake and introduced EVM compatibility through Crescendo, allowing Ethereum developers and applications to deploy on Flow while leveraging its unique architecture for superior scalability.
Flow proved that blockchain applications can achieve mainstream consumer adoption when the user experience is prioritized above all else. NBA Top Shot introduced millions of non-crypto-native users to digital collectibles, demonstrating that blockchain technology works best when it's invisible to the end user. Flow's multi-node architecture represents a genuinely novel approach to blockchain scaling that preserves composability — a critical property that sharding sacrifices. The Cadence programming language introduced resource-oriented programming to blockchain development, offering stronger safety guarantees than Solidity. Flow's journey also illustrates the challenges of building a standalone Layer 1 in an increasingly crowded market.
How It Works
The Basics
Flow's multi-node architecture splits mining into four roles: Collection nodes batch transactions, Consensus nodes determine transaction ordering using a HotStuff-based Proof of Stake protocol, Execution nodes perform the computations (running smart contracts), and Verification nodes check the correctness of execution results using a technique called Specialized Proofs of Confidential Knowledge (SPoCKs). This separation allows each role to scale independently — execution can be scaled by adding more powerful execution nodes without requiring all validators to process every transaction.
Pros & Cons
- Purpose-built for consumer apps with NBA Top Shot proving blockchain can reach mainstream millions
- Multi-node architecture scales without sharding, preserving full smart contract composability
- Cadence language offers stronger safety guarantees than Solidity through resource-oriented programming
- EVM compatibility through Crescendo upgrade opens Flow to the entire Ethereum developer ecosystem
- Backed by Dapper Labs with deep entertainment industry partnerships (NBA, NFL, UFC, LaLiga)
- Developer ecosystem is significantly smaller than Ethereum, Solana, or other major Layer 1s
- Cadence language adoption has been slow — the learning curve deters developers familiar with Solidity
- NFT market downturn significantly impacted Flow's core use case and transaction volumes
- Heavy dependence on Dapper Labs for ecosystem development creates centralization concerns
- FLOW token price has declined substantially from launch highs, reducing community and investor confidence
Use Cases
- Building consumer-facing NFT applications with seamless onboarding and custodial wallet experiences
- Developing blockchain games that leverage Cadence's resource-oriented programming for secure asset management
- Deploying Ethereum applications on Flow via EVM compatibility for improved scalability and lower costs
- Staking FLOW tokens across the four node roles to earn rewards and secure the network
- Creating digital collectibles and entertainment experiences with major sports and media brand partnerships
Technical Details
- Consensus
- Proof of Stake (HotStuff)
- Launch Year
- 2020
- Founder
- Dapper Labs (Roham Gharegozlou)
- Max Supply
- No hard cap
- Blockchain
- Flow
- Website
- flow.com