Introduction
Bitcoin mined its first block on January 3rd, 2009. The network has since developed a devoted following convinced that Bitcoin offers a solution to financial system problems. However, this conviction hasn’t fostered an environment where broader crypto innovation could thrive. Other developers gravitated toward smart contract platforms offering more interactive possibilities.
While Ethereum encountered scaling challenges and developed Layer 2 solutions, Bitcoin’s most significant innovation for years was the Lightning Network — designed to scale peer-to-peer payments.
The SegWit Upgrade and Recent Changes
Until late 2022, Bitcoin’s development landscape remained relatively static. The SegWit upgrade introduced new signature types and expanded smart contract flexibility. Since then, two developments have accelerated activity: Ordinals and the introduction of rollups on Bitcoin.
What’s the deal with Ordinals?
Ordinals represent tokens issued through the Ordinals protocol, launched in 2022 by developer Casey Rodarmor and going live on mainnet in 2023. The protocol renewed interest in Bitcoin participation, with participants asking how to run Bitcoin nodes.
How Ordinals Work
Ordinals create a unique ordering system for Satoshis (Bitcoin’s smallest unit), enabling users to inscribe any information into tokens. The process involves:
- Adding unique identifiers to Satoshis based on their chronological mining order
- Allowing users to inscribe arbitrary content to individual Satoshis
- Essentially creating NFT-like assets
Bitcoin Ordinals vs. Ethereum NFTs
Unlike Ethereum NFTs, Bitcoin Ordinals leverage the UTXO (unspent transaction outputs) model, making every Bitcoin uniquely identifiable. Ethereum uses an account model tracking fungible token balances.
The key distinction: all of the metadata (the data about the NFT, including things like the image, description, and name) is stored on the blockchain for Bitcoin Ordinals. Most Ethereum NFTs store metadata on external solutions like Arweave, IPFS, or centralized cloud services due to blockchain storage costs.
Ordinals triggered significant speculation and ecosystem activity growth. Supporters view them as a more secure, permissionless token method embedded at Bitcoin’s base layer.
The Community Divide
The increased interest created friction within Bitcoin’s community:
Concerns:
- Inscribing numerous images stresses the blockchain
- During early Ordinals activity, even Lightning Network experienced disruptions as blockspace became limited
- Increased on-chain storage raises node operation requirements
- This potential centralization contradicts Bitcoin’s decentralization ethos
Supporting Arguments:
- Mining rewards eventually expire; transaction fees from Ordinals strengthen the security budget
- Ordinals introduce new functionality and attract developer talent
- As Bitcoin’s price increases, ecosystem liquidity and investment potential grow
Currently, the disagreement hasn’t escalated to blockchain-level resolution through forking. Miners have financial incentives to accept increased fees, preventing major splits.
Bitcoin Rollups
Rollups represent the latest Bitcoin innovation, borrowing proven concepts from Ethereum’s ecosystem. They function by processing transactions off the mainnet, increasing throughput and reducing costs.
How Rollups Work
- Optimistic rollups assume correct transaction verification
- Recent implementations incorporate Zero-Knowledge Proofs (ZKPs) for trustless verification
- Two teams currently develop ZK rollup solutions for Bitcoin:
- Chainway team — open-sourced their DA adapter through the Sovereign SDK, enabling Bitcoin security for custom rollups
- Kasar Labs — partnered with Taproot Wizards to integrate the Madara Stack for Starknet-based rollups
Additional Bitcoin infrastructure projects include Merlin protocol (adding DeFi functionality) and Nubit (offering data availability for Layer 2s).
Why Bitcoin Rollups Matter
Lightning Network adoption remained limited for several reasons:
- Required users to maintain online status to receive payments
- Depended on channel operators depositing funds to provide liquidity
Rollups eliminate these friction points. However, the primary advantage extends beyond payment processing: they enable programming on Bitcoin without requiring mainchain modifications.
Sovereign Rollups
Some Bitcoin rollups pursue sovereignty — they publish transactions to another blockchain purely for ordering and data availability rather than relying on smart contracts as their truth source.
This design differs from Ethereum Layer-2s (smart contract rollups), which depend on L1 smart contracts. Sovereign rollups function as complete blockchains, updated exclusively through community forks, decentralizing decision-making rather than depending on upgradeable contracts.
Conclusion
Both Ordinals and rollups expand Bitcoin’s capabilities beyond a store-of-value function, enabling broader applications. Developing with either technology requires rapid, scalable data access — Subsquid’s specialty.
The momentum underlying these innovations remains uncertain, but talented developers continue building on Bitcoin’s decentralization, security, and censorship resistance to offer functionality beyond simply holding assets.