Halborn has transformed from a code auditor into crypto's unofficial coroner, publishing detailed post-mortems of major exploits for free while quietly becoming the security partner of choice for both blockchain projects and now traditional financial institutions. The Miami-based firm, founded in 2019, has completed over 4,000 security assessments across multiple blockchain ecosystems and is now recruiting leadership from the traditional security industry to bring its expertise to Wall Street banks.

How Did a Blockchain Auditor Become Crypto's Breach Investigator?

Halborn's reputation was built on finding deep, cross-ecosystem vulnerabilities that other auditors missed. In March 2022, the firm discovered a critical flaw in Dogecoin's codebase that affected more than 280 networks, including Litecoin and Zcash, putting over $25 billion in digital assets at risk. The vulnerability, known as Rab13s, sat in the peer-to-peer layer and could crash nodes or enable remote code execution on individual miners. Halborn worked quietly with affected projects to patch the issue before coordinating a public disclosure in March 2023.

But Halborn's real inflection point came when it began publishing detailed incident post-mortems on its blog. After the April 2026 Kelp DAO hack, which drained 116,500 rsETH (worth approximately $292 million) from a cross-chain bridge in hours, Halborn published a technical autopsy titled "Explained: The Kelp DAO Hack." The post-mortem revealed something striking: there was no bug in Kelp's smart contracts at all. Instead, attackers tied to North Korea's Lazarus Group had socially engineered a developer at LayerZero, the bridge provider, harvested session keys, and poisoned the infrastructure that verified cross-chain messages. OpenZeppelin, reviewing the same incident independently, published its own analysis under a title that captured the moment: "$292 Million Lost, Zero Bugs Found".

These autopsies are fast, technical, and free, yet they are read far beyond the victim's own community. Halborn now publishes a steady series of "Explained" pieces covering major DeFi exploits, alongside a monthly roundup of the largest hacks. The firm has become the default source for understanding what actually went wrong when millions of dollars vanish from crypto protocols.

What Does Halborn's 2026 Caseload Reveal About Where Crypto Money Is Actually Being Stolen?

The pattern in Halborn's incident responses tells a story that contradicts much of the industry's security narrative. Most people associate blockchain security with smart contract audits, code reviews that hunt for logic flaws in Solidity and other on-chain languages. But Halborn's caseload shows that the most costly breaches rarely stem from contract bugs. Instead, they come from social engineering, stolen credentials, compromised infrastructure, and key theft.

This insight has shaped Halborn's service menu. While the firm still offers manual code audits across EVM chains such as Ethereum, Polygon, and Avalanche, plus Solana, Cosmos, Sui, Aptos, and Algorand, its center of gravity has always been offensive security. The firm's engineers come from penetration testing and red-team backgrounds, and they now offer a range of services designed to catch the vulnerabilities that code audits alone cannot find:

• Red Team Exercises: Simulated end-to-end attacks on people, process, and infrastructure that target the social engineering and key theft vectors behind the biggest losses.
• Penetration Testing: Web application and cloud infrastructure testing that covers the off-chain systems, such as RPC nodes, dashboards, and data pipelines, that attackers pivot through to reach on-chain assets.
• Custody and Key-Management Review: Assessment of wallet, multisig, and signing architecture that directly addresses the stolen-key vector dominating 2026 losses.
• AI Security and AI Red Teaming: Testing of AI models and agent systems for adversarial failure modes, a new service for 2026 as protocols integrate large language models into trading, treasury, and support workflows.

This breadth matters because a reviewer who only reads Solidity code would have missed almost every marquee heist of the past two years. Halborn's assurance and advisory lines are built to examine the whole attack surface, not just the on-chain slice of it.

Why Is a Blockchain Security Firm Now Targeting Wall Street?

Halborn's pivot toward traditional finance represents a bet on the next phase of on-chain risk. The firm was founded in 2019 by Steven Walbroehl and Rob Behnke, two security practitioners who bootstrapped the company for roughly three years before taking outside investment. In July 2022, Halborn announced a $90 million Series A led by growth investor Summit Partners, with participation from Castle Island Ventures, Digital Currency Group, Brevan Howard, Third Prime, Sky Vision Capital, and Fenwick. The funding arrived at the top of the last bull market, when demand for Web3 security appeared bottomless.

The company that capital built is deliberately specialized. Halborn remains fully remote, runs a comparatively lean bench of senior engineers rather than a mass-market audit factory, and has completed more than 4,000 security assessments. Its client base spans layer-1 foundations, infrastructure providers, and exchanges, with recent announcements naming the Solana Foundation, Circle, and BNY Mellon among its customers. Now, under a chief executive recruited from the traditional security industry, the firm is selling both its offensive testing and its post-mortem expertise to banks.

This move signals that institutional finance is beginning to take on-chain risk seriously. As more banks and traditional financial institutions integrate blockchain infrastructure, custody systems, and cross-chain bridges into their operations, they face the same attack surface that has drained billions from crypto-native projects. Halborn's advisory and CISO-as-a-service offerings, which provide architecture review, compliance readiness, and ongoing security leadership, represent the wedge into regulated clients who need both technical depth and institutional credibility.

The firm's newest addition, AI security and AI red teaming, signals where Halborn believes the next attack surface is opening. As protocols wire large language models and autonomous agents into on-chain workflows, the potential for prompt injection, data leakage, and adversarial failure modes creates a new class of vulnerability that traditional audits never contemplated. While this business is small today, it represents Halborn's bet on the evolution of on-chain risk in the years ahead.

Halborn's transformation from a bootstrapped offensive-security shop to crypto's default post-mortem author and now a vendor to Wall Street reflects a maturation of the industry itself. The firm's caseload proves that the most expensive breaches are not code bugs but failures of people, process, and infrastructure. As institutional capital flows into blockchain, that lesson is becoming impossible to ignore.