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Wallet as a Service

Blocsafe

Multi-chain wallet supporting 8 blockchains, payment gateway, realtime webhooks & blockchain indexing.

3 min read•8 Chains
8 blockchain networksPayment gateway integrationReal-time webhooksCustom blockchain indexer

Tech Stack

Node.jsPostgreSQLRedisWebSocketBlockchainWeb3

Overview

Blocsafe is a comprehensive Wallet-as-a-Service (WaaS) platform that provides businesses with the infrastructure to manage cryptocurrency wallets across multiple blockchains. The platform includes a payment gateway, webhook system, and custom blockchain indexing solution.

The Problem

Businesses wanting to integrate cryptocurrency into their operations face significant challenges:

  • Multi-chain complexity: Each blockchain has different APIs, transaction formats, and confirmation times
  • Infrastructure costs: Running full nodes for multiple chains is expensive
  • Security requirements: Wallet security requires specialized expertise
  • Real-time data: Businesses need instant notifications for transactions

Solution Architecture

Multi-Chain Wallet System

plaintext
┌────────────────────────────────────────────┐
│            Blocsafe API Gateway            │
├────────────────────────────────────────────┤
│         Unified Wallet Interface           │
├────────┬────────┬────────┬────────┬───────┤
│Bitcoin │Ethereum│  BNB   │ Tron   │ More  │
│ Core   │ Node   │ Chain  │ Node   │ ...   │
└────────┴────────┴────────┴────────┴───────┘

Supported Blockchains

  1. Bitcoin (BTC) - Native SegWit support
  2. Ethereum (ETH) - Full ERC-20 token support
  3. BNB Smart Chain - BEP-20 tokens
  4. Tron (TRX) - TRC-20 tokens
  5. Polygon (MATIC) - Layer 2 scaling
  6. Arbitrum - Ethereum L2
  7. Optimism - Ethereum L2
  8. Avalanche - C-Chain support

Key Features

Payment Gateway

Built a payment gateway that enables:

  • Instant payment pages: Generate payment links in seconds
  • Multi-currency support: Accept any supported cryptocurrency
  • Automatic conversion: Convert to stablecoin or fiat
  • Webhook notifications: Real-time payment confirmations

Blockchain Indexer

Developed a custom blockchain indexer for real-time data:

typescript
// Transaction processing pipeline
TransactionStream
  → Decode & Validate
  → Extract Events
  → Match Addresses
  → Trigger Webhooks
  → Update Balances

Webhook System

Real-time notifications with:

  • Guaranteed delivery: Retry logic with exponential backoff
  • Event filtering: Subscribe to specific events
  • Payload signing: HMAC signature verification
  • Delivery tracking: Full audit trail

Technical Implementation

HD Wallet Generation

Used BIP-32/39/44 standards for hierarchical deterministic wallets:

  • Master seed encrypted with AES-256
  • Unique derivation paths per customer
  • Automatic address rotation for privacy

Transaction Processing

Built a robust transaction processing system:

  • Transaction mempool monitoring
  • Confirmation tracking (1-6 blocks)
  • Automatic fee estimation
  • Failed transaction recovery

Results

  • 8 blockchains supported from single API
  • < 3 seconds average transaction detection
  • 99.99% webhook delivery rate
  • Zero security incidents

Technologies Used

  • Backend: Node.js, NestJS, TypeScript
  • Database: PostgreSQL, Redis
  • Blockchain: Web3.js, ethers.js, bitcoinjs-lib
  • Real-time: WebSocket, Redis Pub/Sub
  • Infrastructure: Docker, Kubernetes, AWS
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