Cryptocurrency wallet app development · engineering partner
Crypto wallet app development,
engineered as a product you own.
TrustChange is a cryptocurrency wallet app development company for EU-facing crypto startups, licensed VASPs, PSPs, EMIs, neobanks and banks. We build the wallet apps, admin console, custody stack and audit trail as bespoke software under your brand — not a SaaS licence with a per-user fee. You get a cryptocurrency wallet application your product team can extend, your ops team can run and your auditor can read.
- EU-based engineers
- MiCA-ready architecture
- AML & Travel Rule aware
- GDPR-aware storage
What "wallet app" means here
Crypto wallet app development services without the SaaS strings
Most searches for a crypto wallet app development company surface multi-tenant SaaS with fixed features and a licence fee. We work the other way. TrustChange is a cryptocurrency wallet application development partner: your brand, your data, your keys, your app bundles, your code. What you buy is engineering, not a subscription — and every asset or feature you add later stays on your platform, not on someone else's.
Deciding whether to buy, build or wrap? Start with CTO advisory. Custody depth lives on wallet and custody engineering, and the company-level view on crypto wallet development company.
Product surface
Three surfaces in every crypto wallet app development services engagement
A wallet is not one app. It is the customer-facing product, the internal console your ops team lives in, and the APIs your engineers extend. We ship all three as one product, on one architecture, with one team accountable end to end.
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01
Customer wallet app
iOS, Android and web wallets under your brand. Onboarding, KYC, buy, sell, send, receive, swap, staking and portfolio views ship as one product.
- Native mobile + web
- Design tokens per tenant
- Deep links, push, biometrics
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02
Operator console
The internal console your ops, treasury and risk team runs the wallet from — users, transfers, cases, limits, allow-lists and policy behind role-based access.
- Role-based access
- Case review queue
- Policy & limit editor
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03
APIs & SDKs
Server APIs and mobile SDKs so your product team can extend flows or embed the cryptocurrency wallet application inside an existing product suite.
- Signed REST + webhooks
- Native iOS + Android SDKs
- Sandbox environment
Stack
What sits behind a cryptocurrency wallet application
Eight layers, one system. Every layer names an owner, a control and a piece of audit evidence — nothing is left implied under the "wallet app" label.
Delivery patterns and evidence: how we deliver. Wider platform view: fintech infrastructure. Fiat-in and fiat-out flows: on- and off-ramp integration.
| Layer | What we build |
|---|---|
| Product surface | iOS, Android and web wallets under your brand, driven by design tokens One product surface, no shared multi-tenant backend behind it. |
| Wallet & key material | MPC (threshold) or HSM-backed signing across hot, warm and cold tiers Keys are generated inside your trust boundary and never leave it. |
| Chain coverage | Bitcoin, EVM chains, Solana and other UTXO/account networks New chains land as plug-ins on one wallet core, not a fork. |
| Ramps & liquidity | Card, SEPA and open-banking rails routed through partner PSPs and licensed on/off-ramp providers Quotes lock a rate for a set window; settlement reconciles daily. |
| Compliance controls | KYC/KYB, sanctions and wallet-risk screening, Travel Rule messaging on transfers Rules run inside the flow; every decision writes to the audit log. |
| Ledger & reporting | Double-entry ledger with daily reconciliation and export bundles Finance, ops and the auditor read the same source of truth. |
| Notifications & data | Push, email and in-app notifications, event stream and warehouse loads One canonical event stream, versioned schemas. |
| Runtime & delivery | EU-hosted, CI/CD pipelines, observability, 24/7 on-call cover Your identity provider, your key custody, your data regions. |
Withdraw path
How a withdrawal crosses the wallet app
Every send in the cryptocurrency wallet app 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.
- 01
Request
Real time
A user starts a send from the wallet app; the request is signed by the app and stamped with device metadata.
- 02
Policy
Sub-second
Limits, allow-lists, quorum thresholds and role checks run before any key is touched.
- 03
Screening
Sub-second
Sanctions and wallet-risk vendors return a verdict; the reason is stored with the request.
- 04
Sign
Sub-second
MPC or HSM signing runs inside your trust boundary; keys never leave it.
- 05
Broadcast
Chain-bound
The signed transaction goes on chain; on-chain reads confirm inclusion and status.
- 06
Ledger
Immediate
A double-entry write closes the loop and posts to finance, ops and the audit log.
Delivery
How we deliver a cryptocurrency wallet app development project
Five steps, in this order. Regulated wallet work runs inside the product backlog — no separate compliance phase bolted on before launch, no big-bang release of an untested cryptocurrency wallet application.
- 01
Scoping
Weeks 1–2
We map users, chains, ramps, 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, key handling, chain adapters, screening flow and mobile release plan written down first. Regulatory constraints shape the design.
- 03
Build
Two-week sprints
Product surface, custody, ramps and admin ship in slices. Each merge runs tests, static checks and a dependency scan.
- 04
Hardening
Before launch
Load work, failure drills, mobile store review preparation and a third-party pen-test window. Recovery is rehearsed with your staff.
- 05
Launch and run
Cutover + ongoing
Named engineers on 24/7 cover. Runbooks, dashboards, release playbooks and the audit log are handed to your team on day one.
Engagement
Four ways to buy your crypto wallet app build
Same engineers, same standard. Only the commercial shape changes.
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Fixed-scope build
A defined wallet app at a fixed price and date. Best when the asset list and rails are settled.
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Dedicated team
A standing squad with a lead. Best for long roadmaps and new chains each quarter.
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Staff augmentation
Senior engineers inside your team. Best when you already own the plan and need wallet depth.
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CTO advisory
Architecture and buy-vs-build review before you commit. Best at the design stage.
Questions
FAQ: cryptocurrency wallet app development
Six answers up front on scope, ownership, chains, custody, compliance and support. Bring the rest to the call.
What do you mean by cryptocurrency wallet app development at TrustChange?
We engineer a branded, client-owned crypto wallet app end to end — the mobile and web surface, the wallet and key material, the on-chain integrations, the ramps and the compliance controls. It ships as source code in your repositories, with the IP assigned to you, and the app bundles are signed under your own Apple and Google identifiers. There is no per-user fee and no shared multi-tenant backend between you and your customers.
How is your crypto wallet app development company different from an off-the-shelf provider?
Off-the-shelf crypto wallet app development services usually bundle a generic app with a hidden backend and hand you a licence. TrustChange is a cryptocurrency wallet app development company that engineers the app, the custody, the indexer and the controls against your actual use case — assets, chains, ramps, licence context and audit expectations. A bespoke build takes longer up front, but you keep every line of code, every key and every control decision.
Which chains, assets and features can the crypto wallet application cover?
Bitcoin, EVM chains (Ethereum, L2 rollups, side chains), Solana and other UTXO or account networks land as plug-ins on one wallet core, so adding a new chain is not a fork. Standard flows include onboarding and KYC, buy and sell, send and receive, swap, staking, dApp browser access and portfolio views. Fiat rails cover card, SEPA and open banking routed through partner PSPs and licensed on/off-ramp providers, with settlement reconciled against your ledger daily.
How do keys, custody, biometrics and audit work in the wallet app you deliver?
Keys are generated inside your trust boundary and never leave it. Signing runs on MPC (multi-party computation) or an HSM, with hot, warm and cold tiers, per-asset velocity caps, allow-lists and quorum approvals above defined thresholds. Device-side auth uses platform biometrics with secure-enclave key storage. Every request, policy version, screening verdict and on-chain result is written to a signed, time-ordered audit log that a regulator or external auditor can read.
How are MiCA, PSD2, AML/Travel Rule and GDPR engineered into the wallet app?
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 and GDPR-aware storage with data mapping and retention rules. Nothing about licences, opinions or supervisor approvals is claimed on your behalf.
Do you also run the wallet app after launch, or hand it over?
Both are on the table. Most clients start with named TrustChange engineers on 24/7 cover during the first months while their own team ramps up, then take the platform in-house with runbooks, dashboards, release playbooks and the audit bundle. Some keep us on as a dedicated development team or on staff augmentation for new-chain and roadmap work, or as CTO advisory on architectural calls.
Book a discovery call for cryptocurrency wallet app development
Bring the asset list, the licence context, the target markets and the launch date. We come back with a control map, an architecture view and a costed plan for a wallet app you own end to end. No demo theatre.