What is crypto wallet & custody development?
NNT Software develops cryptocurrency wallets and custody infrastructure: non-custodial mobile and browser wallets, custodial wallets for exchanges and fintechs, and MPC or multisig custody with policy-based approvals for institutions, supporting Bitcoin, Ethereum, EVM chains, Solana and stablecoins.
A wallet is where security meets user experience: keys must be impossible to steal yet easy to recover, and transactions must be fast yet controlled.
We design key management first — MPC, multisig, HSM or secure-enclave storage — and then build clean consumer or institutional interfaces around it.
Key benefits of crypto wallet & custody development
Institution-grade security
MPC and multisig remove single points of failure.
Better onboarding
Social recovery and passkeys make self-custody easier.
Multi-chain reach
Support for major chains and stablecoins.
Policy control
Approval workflows for treasuries.
Compliance hooks
Screening and travel-rule integration.
Our crypto wallet & custody development capabilities
Non-custodial wallets
Seed-phrase and social-recovery wallets for iOS, Android and browser.
MPC custody
Threshold signatures with no single point of key compromise.
Policy engine
Whitelists, limits and multi-approver workflows for treasuries.
Multi-chain support
BTC, ETH, EVM L2s, Solana, Tron and stablecoins.
dApp connectivity
WalletConnect, swaps, staking and NFT views.
Compliance hooks
Address screening and travel-rule integration.
Outcomes clients typically see: institution-grade key security, smooth user onboarding and audit-ready controls.
Common use cases
Consumer wallets
Self-custody apps for retail users.
Exchange wallets
Custodial infrastructure for platforms.
Treasury custody
Corporate and fund custody with approvals.
Embedded wallets
Wallets inside games and fintech apps.
Technology stack
We choose technology for long-term maintainability, performance and the skills available to your team. Typical crypto wallet & custody development stack:
- MPC-TSS
- Flutter — Google's cross-platform toolkit that compiles to native iOS and Android apps
- React Native — cross-platform mobile framework sharing logic with React web apps
- Rust — memory-safe systems language used for performance-critical and blockchain code
- Node.js — fast, event-driven JavaScript runtime for APIs and real-time features
- HSM
How much does crypto wallet & custody development cost?
The final cost of crypto wallet & custody development depends on five main factors: the number of user roles and screens, the integrations required (payments, identity, ERP, CRM, messaging), compliance and security requirements, the seniority mix of the team, and the engagement model.
We always start with a short discovery phase so the estimate you receive is fixed and written, not a vague range. Ongoing maintenance and hosting typically add 15–20% of the build cost per year.
| Scope | Typical timeline |
|---|---|
| Non-custodial wallet app | 2–4 months |
| Custodial wallet backend | 3–5 months |
| MPC custody platform | 4–8 months |
| Security audit | 3–4 weeks |
How we deliver crypto wallet & custody development projects
Every crypto wallet & custody development engagement follows the same disciplined, transparent process. You always know what is being built, what it costs and what comes next.
1. Discovery and scoping (1–2 weeks)
Workshops with your stakeholders to understand goals, users, workflows and constraints. We document requirements as user stories, map integrations and agree success metrics, then share a written scope, milestone plan and fixed estimate for crypto wallet & custody development.
2. UX and architecture (1–3 weeks)
Designers produce user flows and a clickable prototype while architects choose the stack, hosting, data model and security controls. Nothing is built until you sign off the prototype and architecture.
3. Agile development (two-week sprints)
Developers build in short sprints with a demo at the end of each one. You see working software early, give feedback continuously and can reprioritise the backlog at any time.
4. Quality assurance
Dedicated QA engineers write test cases, run manual and automated regression tests, check performance and review security basics before every release. Defects are tracked openly.
5. Launch
We deploy with zero-downtime pipelines, migrate data if needed, monitor closely during the first days and train your team or users.
6. Support and growth
After launch, SLA-backed support covers bug fixes, monitoring, security patches and continuous improvement, so the product keeps improving as your business grows.
Engagement models and pricing options
You can engage NNT Software for crypto wallet & custody development in whichever way fits your budget, risk appetite and internal team.
| Model | Best for | How billing works |
|---|---|---|
| Fixed price | Clearly defined scope and deadline | Agreed price split into milestone payments |
| Dedicated team | Long-term products and evolving roadmaps | Monthly fee per engineer, scale up or down |
| Time & materials | Exploratory or fast-changing work | Hourly or daily rates against actual effort |
| Hybrid | Fixed MVP followed by ongoing growth | Fixed first phase, then monthly team |
Whichever model you choose, you own the source code and intellectual property, work directly with the engineers, and receive weekly progress reports and demos.
Security, quality and compliance standards
Security and quality are built into every crypto wallet & custody development project from the first sprint, not added before launch.
- Secure coding aligned with the OWASP Top 10 and peer code reviews on every change
- Encryption in transit (TLS) and at rest, secrets stored in managed vaults
- Role-based access control, multi-factor authentication and audit logs
- Automated tests in CI pipelines, plus manual exploratory and regression testing
- Data-protection by design for GDPR, CCPA, PDPL, DPDP and similar laws
- Infrastructure as code, monitoring, alerting and tested backups
- NDA before discovery and full IP assignment in the contract
Common crypto wallet & custody development mistakes to avoid
- Storing keys insecurely on servers.
- No recovery path for lost devices.
- Supporting too many chains at launch.
- Ignoring address screening.
- No audit of key-management code.
Crypto Wallet & Custody Development trends for 2026
- MPC becoming the institutional default.
- Account abstraction and smart wallets.
- Passkey-based wallets.
- Stablecoin payments in wallets.
How to choose a crypto wallet & custody development partner
Use this checklist when comparing vendors:
- Explains key management clearly
- Has audited wallet code
- Supports needed chains
- Builds approval policies
- Integrates compliance tools
- Plans incident response
Why companies outsource to NNT Software in India
India is the world's largest software-services hub, and NNT Software combines that talent depth with a product mindset. For crypto wallet & custody development, clients typically save 40–60% compared with agencies in the United States, United Kingdom, the Gulf or Australia, without compromising on quality or communication.
Our engineers work in English, overlap daily with your business hours and follow documented processes. You get a named project manager, direct access to developers, and the stability of a company that has delivered more than 2,000 projects since 2010 and runs eight of its own SaaS products.
Crypto Wallet & Custody Development for clients worldwide
We deliver Crypto Wallet & Custody Development for businesses in 95 countries across North America, South America, Europe, Gulf & Middle East, Asia Pacific and Africa. Overlapping working hours, local payment and compliance knowledge, and remote-first collaboration make distance irrelevant.
- North America: United States, Canada, Mexico, Panama, Costa Rica, Dominican Republic, Guatemala, Puerto Rico, Jamaica, Trinidad and Tobago, The Bahamas
- South America: Brazil, Argentina, Colombia, Chile, Peru, Uruguay, Ecuador, Paraguay
- Europe: United Kingdom, Ireland, Germany, France, Netherlands, Belgium, Luxembourg, Spain, Portugal, Italy, Switzerland, Austria, Sweden, Norway, Denmark, Finland, Poland, Czech Republic, Romania, Greece, Malta, Cyprus, Estonia, Lithuania, Hungary, Croatia, Bulgaria, Serbia, Slovakia, Slovenia, Latvia, Iceland, Georgia, Armenia
- Gulf & Middle East: United Arab Emirates, Saudi Arabia, Qatar, Kuwait, Bahrain, Oman, Türkiye, Jordan
- Asia Pacific: Australia, New Zealand, India, Singapore, Malaysia, Indonesia, Thailand, Vietnam, Philippines, South Korea, Sri Lanka, Bangladesh, Kazakhstan, Uzbekistan, Azerbaijan, Nepal, Cambodia, Fiji
- Africa: South Africa, Nigeria, Kenya, Egypt, Morocco, Ghana, Rwanda, Mauritius, Tanzania, Uganda, Ethiopia, Côte d'Ivoire, Senegal, Tunisia, Botswana, Zambia
Select a country from the market list on this page for regulation, payments and delivery details specific to that market.
Next steps
Ready to discuss crypto wallet & custody development? Here is how to get started with NNT Software:
- Share your goals, users, must-have features and timeline through the contact form, email or WhatsApp.
- Join a free 30-minute discovery call with a solution architect — we sign an NDA first if you prefer.
- Receive a written proposal within 48 hours: scope, milestones, team, timeline and fixed estimate.
- Kick off with a discovery workshop and see working software in your first sprint demo.