Blockchain Development: Layer 1 or Layer 2 — How to Choose
Blockchain development does not start with choosing a network, but with determining whether you need a public, immutable ledger at all. If verifiable data provenance, tokens, crypto payments or smart contracts are important, the choice between Layer 1 and Layer 2 determines security, fees, speed and future integrations. A practical example is Crypto.bg — a platform for buying and selling cryptocurrencies with payments in Bulgarian levs.
What Does Blockchain Development Involve?
Blockchain development means building software that uses a distributed network to record, verify and execute operations. This can be a proprietary blockchain platform, an application built on an existing network, a smart contract, a wallet, an exchange or an API integration with an ERP, CRM, website or payment system.
The difference from a conventional database lies in how a record is confirmed. In a standard system, your server or administrator controls the database. In a public blockchain, the validation rules are built into the protocol and enforced by independent participants in the network.
This does not make every process better. If only your team enters the data and there is no need for anyone else to verify it, a relational database is usually simpler, faster and cheaper. Blockchain makes sense when trust between participants is an issue or when an asset and its history need to be verifiable.
What Can a Project Include?
- analysis of the business process and participant roles
- choosing a network, data model and method for signing operations
- smart contracts for rules, payments, tokens or access rights
- a web or mobile application for users
- wallets, key management and access recovery
- API integrations with payments, accounting, ERP, CRM and external services
- monitoring, testing, code auditing and a maintenance plan
When Does a Business Need Its Own Blockchain Platform?
A proprietary Layer 1 makes sense when you control an ecosystem with separate participants and need your own rules. Examples include a network connecting suppliers, manufacturers and distributors, a specialised registry, or a platform where transactions must not depend on someone else’s protocol.
This is a major undertaking. With your own Layer 1, you are responsible for consensus, validation, updates, attack protection, developer tools and network stability. There must be a reason to build infrastructure, rather than just an application.
For most companies, the more practical option is an application built on an existing Layer 1 or Layer 2. This allows the team to focus on the product, user interface, business rules and integrations instead of maintaining an entire network.
What Is the Difference Between Layer 1 and Layer 2?
Layer 1 is the underlying blockchain. It validates transactions, maintains the network state and defines the basic security rules. Applications can run directly on it, but every operation is subject to its capacity and fees.
Layer 2 is an additional layer built on top of Layer 1. It processes some operations outside the main network and periodically records a result or proof back on it. The goal is to reduce the load and improve usability without building a completely separate network.
| Criterion | Layer 1 | Layer 2 |
|---|---|---|
| Control | It can be someone else’s public network or your own protocol | Depends on the underlying Layer 1 and its rules |
| Security | Comes directly from the main network’s consensus | Depends on the Layer 2 design, proofs and connection to Layer 1 |
| Scalability | Limited by the capacity of the underlying protocol | Usually enables more operations outside the main layer |
| Fees | Paid directly to the main network and may vary | May be more predictable, but involve additional rules and costs for transferring assets |
| Integrations | Supported by Layer 1 wallets, exchanges and tools | Bridges, wallets, RPC services and exchange support must be checked |
| Suitable for | Base assets, public registries and protocols with direct liquidity | Applications with many operations and a need for better performance |
The table is a starting point, not a final assessment. Two Layer 2 protocols may have different architectures, different tools and different risks when transferring assets. The specific technology should be assessed against your use case, not just its popularity.
How do security, scalability and fees compare?
Security
The first question is not “which layer is more secure,” but “where is the critical logic located?” If a smart contract holds funds or determines ownership, an error in it can be more serious than a problem in the user interface. Restricted permissions, key protection, testing and an independent review of the critical code are required.
With Layer 2, check how operations are confirmed, how data is published to Layer 1, and what happens if the operator or bridge goes offline. With your own Layer 1, also assess the validators, protocol updates and the incident response process.
Scalability
Do not measure scalability by transaction count alone. The size of the operation, dependencies between transactions, the need for immediate finality and the number of users working simultaneously all matter. A trading application, a tracking system and a game have different load profiles.
Fees
The fee is not the only cost. There are costs for an RPC provider, blockchain data indexing, file storage, monitoring, wallets, asset conversion and liquidity maintenance. With many operations, a small per-transaction fee can make a difference, but with low volume, security and available integrations may be more important.
How does a blockchain application integrate with the rest of the software?
Users should not have to see the entire blockchain mechanism. In most projects, they use a web or mobile application, while the server handles authentication, permissions, notifications and connections to external systems.
An ERP or CRM integration can record the customer, order, invoice and payment status. The blockchain can store proof of the operation, ownership or origin, but it is not advisable to store personal data, internal prices or large files on it. This data remains in a controlled system, while the network stores the necessary hash or identifier.
When choosing, check the API documentation, SDK packages, compatibility with wallets, webhooks, indexers and payment providers. Clear boundaries between the blockchain logic and the business system are important when connecting to existing software. If you need this type of architecture, you can explore our API integrations and software connectivity service.
How do you estimate the timeline and budget for a blockchain project?
The estimate starts with the scope, not the name of the technology. A project with a wallet, smart contract, admin panel, payments and CRM integration has a different scope from a minimal application that only reads public data.
- 01Describe the business operation
Record who creates the operation, who approves it, what changes and how the result is proven. Separate mandatory features from ideas for the next version.
- 02Separate data by storage location
Determine what should go on the blockchain, what should go in your own database and what should go in file storage. This affects security, costs and the ability to make corrections.
- 03Choose an architectural option
Compare your own Layer 1, an application on Layer 1, Layer 2 and a standard system. Check wallets, APIs, indexing, bridges and available tools.
- 04Build a technical prototype
Test one critical operation: signing, a smart contract, a payment, reading an event or synchronising with an ERP. This reveals limitations before the entire product is built.
- 05Plan security and operations
Include key management, roles, logs, a fallback scenario, monitoring, auditing and a change process. Maintaining a blockchain application does not end when it is published.
For custom software, the budget depends on the number of roles and screens, the complexity of the smart contracts, the number of integrations, security requirements, the mobile version and the need for an admin panel. For projects within the scope of custom software, the indicative price is €3,000–€29,300. The exact cost is stated in the proposal after receiving the technical specification and reviewing the chosen architecture.
What is a sensible choice for different business scenarios?
| Scenario | Better fit | Reason |
|---|---|---|
| Public token or asset | Existing Layer 1 or Layer 2 | You get a ready-made ecosystem, wallets and tools |
| Many small operations in an application | Layer 2 | Can reduce the load and improve the user experience |
| Network of independent organisations | Your own Layer 1 or a permissioned ledger | You need your own rules, roles and participant governance |
| Verifiable provenance of a product or document | Blockchain proof plus a standard system | You retain proof of a change without uploading all business data to the network |
| Internal process for a single company | ERP, CRM or a standard database | Distributed consensus does not provide enough benefit |
What should you ask the development team?
Ask for an architecture diagram, a description of the data flow and a clear boundary between the blockchain component and the rest of the software. The proposal should specify what is included in the first version, which services are external and how the project will change if the chosen network changes its fees or tools.
Check how keys and permissions are managed, who has access to the production environment, how failed transactions are monitored and how operations are restored after an outage. You should also receive a plan for handing over the code, documentation and access credentials.
If the goal is a business application rather than a technology experiment, start with a small, verifiable workflow. For example, create a transaction, confirm it, display it in the admin panel and synchronise it with the existing system. Then expand only the features that deliver real value.
Frequently asked questions
- What is Layer 1 in blockchain?
- Layer 1 is the primary blockchain network that validates transactions and maintains the protocol rules. An application can run directly on it, but must work within its capacity and fee limits.
- What is Layer 2 in blockchain?
- Layer 2 is an additional layer built on top of Layer 1 that processes some operations outside the main network. It aims to deliver better performance and more suitable costs, but requires checking the specific architecture, bridge and wallet support.
- Does a small business need its own blockchain?
- Usually not, if the process is used only within the company and there is no need for independent verification of the records. In that case, ERP, CRM or a standard database are often more suitable.
- How much does custom blockchain development cost?
- For a custom software project, the indicative price is €3,000–€29,300. The price depends on the smart contracts, number of integrations, wallets, mobile application, security requirements and chosen network; the exact amount is specified in the proposal.
