Multi-cryptocurrency wallet · engineering partner
Multi-currency crypto wallet development,
engineered as a system you own.
TrustChange is a multi cryptocurrency wallet development company for EU-facing crypto startups, licensed VASPs, PSPs, EMIs, neobanks and banks. We engineer the wallet apps, the chain-plugin core, the typed asset registry, the custody stack and the audit trail as bespoke software under your brand — not a SaaS licence with a per-user fee. New chains and stablecoins land as adapters your engineers can extend, not vendor-gated features you have to wait for.
- EU-based engineers
- MiCA-ready architecture
- AML & Travel Rule aware
- GDPR-aware storage
What "multi-currency" means here
Chain coverage without a rented multi-currency SaaS
Most searches for multi cryptocurrency wallet development surface multi-tenant SaaS with a fixed asset list. We work the other way. TrustChange builds the wallet on a chain-plugin core with a typed asset registry, so Bitcoin, EVM chains, Solana and other networks live side by side under one policy layer. Below is a reference view of what we typically cover, scoped against your product and licence context.
Deciding whether to buy, build or wrap? Start with CTO advisory. Custody depth lives on wallet and custody engineering. Wallet- vs company-vs app-level angles: crypto wallet development company, crypto wallet app development.
| Family | Coverage | Note |
|---|---|---|
| Bitcoin & UTXO | Bitcoin, Litecoin, Bitcoin Cash | UTXO management, RBF, dust and change handling under one policy. |
| EVM chains | Ethereum + L2 rollups (Arbitrum, Optimism, Base, Polygon) and other EVM networks | One adapter per chain; ERC-20 and ERC-721/1155 tokens ride on top. |
| Solana | Solana mainnet with SPL token support | Rent-aware account model handled inside the wallet core. |
| Other account chains | Tron, TON, Cosmos-family and other account networks as needed | New chains land as plug-ins on one core, not a fork. |
| Stablecoins & tokens | USDC, USDT and other stablecoins across supported chains | One typed asset registry — same schema, different rails. |
Product surface
Three surfaces in every multi cryptocurrency wallet development company engagement
A multi-currency wallet is not one app. It is the customer-facing product, the internal admin your ops and treasury teams live in, and the APIs your integrators build against. We ship all three as one product, on one architecture, with one team accountable end to end.
-
01
Customer wallet app
iOS, Android and web wallets under your brand: onboarding, KYC, per-asset send and receive, swap, staking (where the chain supports it) and portfolio views.
- Native mobile + web
- Per-asset send / receive
- Cross-asset swap
-
02
Asset & chain admin
The internal console your ops and treasury team runs the wallet from — assets, chains, tokens, per-asset limits, allow-lists, screening rules and treasury positions.
- Asset registry
- Per-chain policy
- Treasury dashboards
-
03
APIs, SDKs & webhooks
Server APIs, mobile SDKs and signed webhooks so integrators and your product team can extend the multi-cryptocurrency wallet across product lines.
- Signed REST + webhooks
- Native iOS + Android SDKs
- Sandbox environment
Stack
What sits behind a multi-cryptocurrency wallet
Eight layers, one system. Every layer names an owner, a control and a piece of audit evidence — nothing is left implied under the "multi-currency" label.
Related specialised builds: white label crypto wallet development, crypto key management system development. Delivery patterns: how we deliver.
| Layer | What we build |
|---|---|
| Chain plugin core | A single wallet core with per-chain adapter plug-ins (encode, sign, broadcast, index) Adding a new chain writes an adapter — it does not fork the app. |
| Asset registry | Typed catalogue of assets, chains, decimals, contract addresses, fees and per-asset policy Every asset has one entry; UI, admin and reports read from the same source. |
| 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. |
| Cross-asset UX | Portfolio, swap and receive-anywhere flows that normalise across chains and asset schemas Users see assets, not chain protocol details, unless they ask. |
| Fiat rails & liquidity | Card, SEPA and open-banking rails 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 on transfers, per-asset velocity caps Rules run inside the flow; every decision writes to the audit log. |
| Ledger & reporting | Double-entry ledger with daily reconciliation across chains and export bundles Finance, ops and the auditor read the same source of truth. |
| Runtime & delivery | EU-hosted, CI/CD pipelines, observability, 24/7 on-call cover Your identity provider, your key custody, your data regions. |
Send path
How a send crosses a multi-chain wallet
Every transfer in the multi-cryptocurrency wallet goes through the same gates before a key is ever touched — no matter which chain is on the other side.
- 01
Compose
Real time
The user selects asset and destination; the wallet resolves the correct chain adapter, fee model and address format.
- 02
Policy
Sub-second
Per-asset 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; the chain-specific encoder assembles the transaction.
- 05
Broadcast
Chain-bound
Broadcast to the correct chain; the indexer confirms inclusion, and the ledger posts a double-entry.
- 06
Reconcile
Daily
Chain state across every supported chain is matched to the ledger; breaks open cases with the full evidence.
Delivery
How we deliver a multi-currency crypto wallet 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 multi-cryptocurrency wallet.
- 01
Scoping
Weeks 1–2
We map users, chains, target assets, 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
Chain-plugin core, asset-registry schema, custody model and screening flow written down first. Regulatory constraints shape the design.
- 03
Build
Two-week sprints
Product surface, custody, chain adapters, admin and ramps ship in slices. Each merge runs tests, static checks and a dependency scan.
- 04
Hardening
Before launch
Load work, failure drills per chain, 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, chain-adapter playbooks and the audit log are handed to your team on day one.
Engagement
Four ways to buy your multi-currency wallet build
Same engineers, same standard. Only the commercial shape changes.
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Fixed-scope build
A defined multi-currency wallet 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: multi cryptocurrency wallet development
Six answers up front on scope, off-the-shelf trade-offs, chain coverage, per-asset controls, compliance and support. Bring the rest to the call.
What does multi cryptocurrency wallet development from TrustChange actually cover?
We engineer a bespoke, client-owned multi-currency wallet end to end: the mobile and web apps, the admin console, the chain-plugin core, the typed asset registry, the custody stack, the compliance controls and the audit trail. It ships as source code in your repositories, with the IP assigned to you. There is no per-asset fee, no shared multi-tenant backend and no vendor gate between you and your users.
How is your multi cryptocurrency wallet development company different from an off-the-shelf provider?
Off-the-shelf multi-currency wallets bundle a fixed asset list and a licence fee, and every new chain requires the vendor's roadmap slot. TrustChange builds the wallet on a chain-plugin core with a typed asset registry — new chains, tokens and stablecoins land as adapters your engineers can extend. A bespoke build takes longer up front, but you keep every line of code, every adapter and every control decision.
Which chains, tokens and assets does the multi-cryptocurrency wallet cover?
Bitcoin and UTXO family (Bitcoin, Litecoin, Bitcoin Cash), EVM chains (Ethereum plus L2 rollups such as Arbitrum, Optimism, Base and Polygon), Solana with SPL tokens, and other account networks (Tron, TON, Cosmos-family) as needed. Stablecoins (USDC, USDT and similar) ride on top of the same typed asset registry. New chains land as plug-ins on one core, not a fork of the app — the exact list is scoped against your product and licence context.
How do keys, custody and per-asset controls work in the wallet 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. Every asset has its own policy in the registry, so a stablecoin transfer and a Bitcoin transfer can carry different limits, screening rules and Travel Rule handling without touching each other's code path.
How are MiCA, PSD2, AML/Travel Rule and GDPR engineered into a multi-currency wallet?
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 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 per asset class where relevant. Nothing about licences, opinions or supervisor approvals is claimed on your behalf.
Do you also run the multi-currency wallet 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, chain-adapter playbooks and the audit log. 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 multi-currency crypto wallet development
Bring the asset list, the target chains, the licence context and the launch date. We come back with a control map, an architecture view and a costed plan for a multi-currency wallet you own end to end. No demo theatre.