Engineering a Real-Time Stacks Blockchain Explorer.
A modern, full-featured blockchain explorer for the Stacks network built with Next.js 16, React 19, TypeScript, and Tailwind CSS. Provides live transaction indexing, smart contract execution decoding, dynamic address history pagination, and Leather/Xverse wallet integration.
Bringing Transparency to Bitcoin Layer 2 Activity.
Blockchains are public ledgers, but raw transaction payloads are unreadable hex strings. The Stacks Blockchain Explorer parses, decodes, and indexes Stacks network transactions in real time, translating Clarity smart contract function calls, asset transfers, and anchor block commits into a human-readable interface.
The Challenges of Indexing Stacks L2 Transactions.
Stacks features 5 distinct transaction types (Coinbase, STX Transfer, Contract Deploy, Contract Call, Microblock) with radically different schema structures.
Contract function calls emit raw Clarity values (tuples, lists, optional types) that must be decoded into structured UI components.
High-volume accounts require efficient offset pagination against Hiro REST API endpoints without triggering rate-limit freezes.
Polymorphic Transaction Payload Decoder (`components/txn-details.tsx`).
The explorer implements TypeScript discriminant matching to parse each transaction type and convert microSTX to STX:
// Actual Transaction Decoder Implementation
function getTransactionInformationByType(result: TransactionDetailProps["result"]): TransactionInformationByType {
if (result.tx.tx_type === "coinbase") {
return { primaryTitle: `Block #${result.tx.block_height}`, secondaryTitle: "", tags: ["Coinbase"] };
}
if (result.tx.tx_type === "token_transfer") {
const stxAmount = (Number.parseFloat(result.tx.token_transfer.amount) / 1_000_000).toFixed(2);
return { primaryTitle: `Transfer ${stxAmount} STX`, secondaryTitle: "", tags: ["Token Transfer"] };
}
if (result.tx.tx_type === "smart_contract") {
return { primaryTitle: result.tx.smart_contract.contract_id, secondaryTitle: "", tags: ["Contract Deployment"] };
}
if (result.tx.tx_type === "contract_call") {
return {
primaryTitle: result.tx.contract_call.function_name,
secondaryTitle: result.tx.contract_call.contract_id.split(".")[1],
tags: ["Contract Call"],
};
}
return { primaryTitle: result.tx.tx_id, secondaryTitle: "", tags: ["Transaction"] };
}Supported Stacks Transaction Payloads.
Coinbase
Block reward distribution and miner mint transactions on Bitcoin L2.
Token Transfer
Native STX asset transfers between accounts formatted from microSTX (÷ 1,000,000).
Smart Contract Deploy
Clarity smart contract deployments with source code preview and byte verification.
Contract Call
Smart contract function execution with parameter decoding and print event logs.
Microblock Txn
Fast-confirmation microblock transaction indexing prior to anchor block commit.
Hiro REST API Indexing & Multi-Wallet Authentication.
Using @stacks/connect, users authenticate using Leather or Xverse wallets. The application queries account balances, active nonce counters, and historic transaction pages directly from Hiro's infrastructure with client-side caching.
Production Tech Stack.
| Layer | Technology | Architectural Rationale |
|---|---|---|
| Frontend Framework | Next.js 16 (App Router) · React 19 | Server-side rendering, dynamic address routing, and high-performance client hydration |
| Type System | TypeScript (Strict) | Comprehensive type definitions for complex Stacks API payloads and Clarity value types |
| Blockchain API | Hiro Stacks REST API | Real-time indexer supplying account transactions, contract ABIs, and block confirmations |
| Wallet Auth | @stacks/connect · Leather · Xverse | Seamless multi-wallet authentication and account balance resolution |
| Styling & UI | Tailwind CSS · Lucide React | Modern, responsive dark-mode interface with accessible status badges and pagination controls |