Engineering partner · EU-based
Custom blockchain development services
for regulated crypto and fintech teams.
TrustChange is a blockchain development services company for EU-facing crypto startups, licensed VASPs, PSPs, EMIs, neobanks and banks. We build the smart contracts, chain integrations, custody paths, indexers and dApps as bespoke, client-owned software — with MiCA, AML/Travel Rule and GDPR requirements engineered into delivery rather than bolted on before launch. What you buy is engineering, not a subscription.
- EU-based engineers
- MiCA-ready architecture
- AML & Travel Rule aware
- GDPR-aware storage
Scope
Six areas covered by our blockchain development services
One team across on-chain and off-chain — so custody, screening and reporting are designed with the contracts, not around them. Every area names a control and a piece of audit evidence, nothing is left implied.
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01
Smart contracts
Solidity and Rust contracts written for money, not for demos. Formal reviewability, deterministic upgrades, and a test suite an auditor can read.
- Solidity + Foundry
- Rust (Solana, CosmWasm)
- Upgrade patterns & pauses
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02
Chain integrations
Deposit, sweep, broadcast and confirmation logic for EVM, UTXO and account chains. New networks land as plug-ins on one core, not a fork.
- EVM + L2s
- Bitcoin + UTXO
- Solana, Cosmos, others
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03
Nodes and indexers
Full nodes, archive nodes, RPC clusters and custom indexers. Data comes from your own infrastructure, not a rate-limited third party.
- Node clusters & failover
- Custom indexers
- Reorg-safe pipelines
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04
dApps and portals
Web front-ends, wallet connectors and admin portals for staking, custody, governance or issuance products, under your brand.
- Wallet connectors
- Signing UX & recovery
- Admin & analytics views
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05
Custody & signing
MPC and HSM signing paths, policy engines, quorum approvals and hot/warm/cold tiering that operations and risk can actually run.
- MPC / TSS
- HSM signing paths
- Withdrawal policy engine
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06
Protocols & L2s
Bespoke L2 designs, rollup deployments, bridge integrations and app-specific chains where an existing network does not fit.
- Rollup deployments
- Bridge integration
- App-chain topology
Stack
Full-stack blockchain development services, layer by layer
Eight layers, one system. Distributed blockchain development services fail on the seams between on-chain and off-chain — so we staff the seams and write down what each layer owns before code lands.
Bringing an existing venue into scope? See crypto exchange development and white label crypto exchange development. Wallet products live on wallet and custody engineering and white label crypto wallet development.
| Layer | What we build |
|---|---|
| On-chain | Smart contracts, upgrade paths, event schema Audited internally; ready for a named third-party review before mainnet. |
| Node & RPC | Own nodes with failover; private RPC and mempool access Rate limits, replay logs and reorg handling are your own, not a vendor's. |
| Indexing & data | Chain-to-ledger indexers, reconciliation, event stores One source of truth for finance, ops and the auditor. |
| Backend services | APIs, queues, workers, screening hooks, policy engine Rules run inside the flow; every decision writes to the audit log. |
| Frontend & dApps | Web apps, wallet connectors, admin portals Signing UX and recovery flows treated as first-class product surface. |
| Keys & signing | MPC or HSM, tiered custody, quorum and allow-lists Keys are generated inside your trust boundary and never leave it. |
| Compliance & controls | KYC/KYB, sanctions, wallet-risk, Travel Rule messaging Set by your advisers, engineered in code, backed by evidence exports. |
| Runtime & delivery | EU-hosted, CI/CD, observability, 24/7 on-call Your identity provider, your key custody, your data regions. |
Transfer path
How a signed transaction crosses the system
Every on-chain action in our IT blockchain development services goes through the same gates before a key is ever touched. Speed comes from tuning the pipeline, not from skipping a step or trusting the caller.
Transfer path: request, policy check, screening, MPC/HSM signing, on-chain broadcast, indexer confirmation, ledger write. Every step writes its reason to a signed log.
Delivery
How we deliver blockchain solutions development services
Five steps, in this order. Regulated on-chain work runs inside the product backlog — no separate compliance phase bolted on before launch, no big-bang release of an untested contract or bridge.
Delivery patterns and evidence live on how we deliver. Platform view: fintech infrastructure.
- 01
Scoping
Weeks 1–2
We map the product, the chains, the licence context and the risk you must stand behind. Output: a scope, a control map and a costed plan.
- 02
Architecture
Weeks 3–4
Topology, contract design, key handling, indexer model and screening flow written down first. Regulatory constraints shape the design, not a later patch.
- 03
Build
Two-week sprints
Contracts, backend, indexers and dApps ship in slices. Every merge runs tests, static checks, a dependency scan and a contract test suite.
- 04
Hardening
Before mainnet
Third-party review window on the on-chain code, load and failure drills off-chain, recovery rehearsed with your staff — not assumed.
- 05
Launch and run
Cutover + ongoing
Named engineers on 24/7 cover. Runbooks, dashboards, monitoring for reorgs and gas anomalies, and the audit log handed to your team on day one.
Engagement
Four ways to hire blockchain development services
Same engineers, same standard. Only the commercial shape and who directs the work changes between models.
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Fixed-scope build
A defined blockchain product at a fixed price and date. Best when scope and chains are settled.
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Dedicated team
A standing squad with a lead. Best for long protocol roadmaps and new chains each quarter.
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Staff augmentation
Senior blockchain and custody engineers inside your team. Best when you already own the plan.
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CTO advisory
Blockchain development consulting services: architecture and buy-vs-build review before commit.
Questions
FAQ: blockchain development services
Six answers up front on scope, chains, end-to-end delivery, compliance, audits and engagement. Bring the rest to the call.
What do you mean by custom blockchain development services, exactly?
TrustChange is a blockchain development services company that engineers bespoke, client-owned systems around and on top of public chains. Scope typically covers smart contracts, chain integrations, nodes and indexers, dApps and admin portals, custody and signing, and the compliance controls that let a regulated operator run the result. Everything ships in your repositories with IP assigned to you — there is no per-seat licence, no shared multi-tenant backend and no vendor gate between you and your users.
Which chains and protocols do your blockchain technology development services cover?
EVM chains and their L2s, Bitcoin and other UTXO networks, Solana, Cosmos-based chains and other account or module-based networks. Public blockchain development services are the common shape, but private and permissioned chains, app-specific rollups and bridges are in scope where a public network does not fit. New chains land as plug-ins on one core so adding an asset or a network is a change, not a fork.
Do you offer blockchain product development services end-to-end, or only the on-chain part?
End-to-end. Full-stack blockchain development services here mean the on-chain code, the nodes and indexers behind it, the backend services and APIs, the dApps and admin portals, and the custody, screening and reporting that make it operable under a licence. We also offer blockchain development consulting services when the right first step is an architecture and buy-vs-build review before any code is written.
How are MiCA, PSD2, AML/Travel Rule and GDPR engineered into the blockchain solutions development services you deliver?
TrustChange is an engineering partner, not a law firm — your legal advisers and MLRO set the policy, we ship the controls and the evidence. That means KYC/KYB flows in onboarding, sanctions and wallet-risk screening before signing, Travel Rule data on crypto transfers, PSD2-aware fiat flows where cash rails are involved, and GDPR-aware storage with data mapping and retention rules. Nothing about licences, authorisations or supervisor approvals is claimed on your behalf.
How do smart contract audits, reviews and formal testing fit into the process?
Contracts are written to be reviewable. Internal review, property-based tests and static analysis run inside the sprint. Before mainnet we schedule a named third-party audit window and hold the release until findings are addressed, then re-run the test suite as part of the deploy. Upgrade paths, pauses and admin roles are documented so the reviewer can reason about the whole surface, not only the entry points.
How do we hire your blockchain development services and what engagement models are available?
Four models: a fixed-scope build when the target product is defined, a dedicated development team when the roadmap runs longer than your headcount, staff augmentation when you already own the plan and need blockchain and custody depth inside your squad, and CTO advisory when a design or buy-vs-build decision needs to be made first. Same engineers, same standard — only the commercial shape and who directs the work changes.
Book a discovery call for your blockchain development services engagement
Bring the product idea, the chains you want to run on, the licence context and the target date. We come back with a control map, an architecture view and a costed plan for a system you own end to end. No demo theatre.