Christopher Grilhault des Fontaines

ℹ️ 𝗨𝗣𝗗𝗔𝗧𝗘 @Stablecoin (now part of @stripe) runs its stablecoin payments on @dfnsHQ 🤝 Since May 2024, Bridge has been in production on Dfns. Nearly 2 years of continuous, high-volume flows with near-zero failure rates 💯 This isn’t a pilot. It’s real infrastructure moving real money. 🌐 Stablecoins moved $15T+ in 2024, and Stripe made its largest acquisition ($1.1B) to bring Bridge in-house as its stablecoin infrastructure layer. That alone tells you where the market is going. Today, Bridge powers cross-border payments, stablecoin issuance, orchestration, and card programs. Under the hood, Dfns handles the wallet infrastructure, signing, and transaction execution that makes all of this work. Because the hard part isn’t sending transactions. It’s making sure they land. Blockchains are non-deterministic. Transactions get dropped, stuck, replaced, it’s a headache to handle. At scale, that’s not an edge case… It's the problem. So we built Dfns differently ⚙️ Deterministic execution, strict nonce control, retries, re-broadcasting, full lifecycle tracking, all the developer tools needed to turn unreliable networks into production-grade payment rails. Bridge and Stripe depend on this every day. 🔗 Get started today: app.dfns.io/get-started 📑 Read the full blog post: dfns.co/blog/announcin…

🆕 @tempo is now live on @dfnsHQ ⚡ Incubated by @Stripe, Tempo is a blockchain built for real-world payments. Stablecoin-native fees, fast settlement, high throughput, predictable latency, native batching, scheduling, concurrent payments, and more. We now support Tempo and its two networks: ✔️ TempoAndantino (dev) ✔️ TempoModerato (prod) With Dfns, builders get institutional-grade infrastructure out of the box: 🟢 Create and manage Tempo wallets 🟢 Transfer stablecoins & TIP-20 tokens 🟢 Enforce approval workflows & policies 🟢 Sign with MPC, HSM & full data integrity 🟢 Monitor events & automate via webhooks 🧰 Get started: app.dfns.io/get-started 📑 Read more: dfns.co/article/tempo-…

🎤 Securing wallets in the AI age Our CISO Thibault de Lachèze-Murel recently joined @stabledash / @stabledash_news to discuss how wallet security is evolving as digital assets become core financial infrastructure. Core idea: security must move toward zero trust and decentralized trust. Every interaction must be verified, every authorization must be explicit, and no single component should become a point of failure. At @dfnsHQ, this philosophy shapes how we design wallet infrastructure used by fintechs and financial institutions to move real money securely. Thanks to the StableDash team for hosting the conversation 🙏

Most discussions around MPC focus on protocol. Rounds. Security assumptions. Performance on paper. But the real question is different: 𝙒𝙝𝙖𝙩 𝙙𝙤𝙚𝙨 𝙞𝙩 𝙩𝙖𝙠𝙚 𝙩𝙤 𝙙𝙚𝙥𝙡𝙤𝙮 𝙈𝙋𝘾 𝙞𝙣 𝙥𝙧𝙤𝙙? Last week at Real World MPC (RWMPC) in Taipei, our lead cryptographer Antoine Urban shared some of the lessons we’ve learned from running MPC systems in the wild at Dfns. A few takeaways: 🔑 In digital assets, the problem starts with the key. Whoever controls the private key controls the funds. 🧩 Threshold cryptography removes single points of failure but only if the system around is well designed. 🏗️ The hardest problems are often architectural: network topology, availability, orchestration, recovery, and scaling under load. 📄 Elegant cryptographic protocols still fail if they collide with the realities of production systems. The talk also dives into topics we rarely see discussed outside engineering teams: ✔️ Why a “Key Management Network” (KMN) is superior to shared custody ✔️ How a coordinator-based star topology reduces operational attack surfaces ✔️ Why pre-signing and batching change MPC performance at scale ✔️ How protocol choices like KU25 impact real-world capacity planning In short: MPC is maturing. The real frontier now is deployability. 📑 Read the full blog post: dfns.co/blog/deploying… 🔗 Explore more research from the Dfns team: dfns.co/labs

Bitcoin doesn’t work like Ethereum. Instead of accounts and balances, it uses UTXOs (Unspent Transaction Outputs). That model is secure by design, but it creates real challenges when systems need to create multiple transactions in parallel. ✅ Dfns supports this now natively with 𝗨𝗧𝗫𝗢 𝗥𝗲𝘀𝗲𝗿𝘃𝗮𝘁𝗶𝗼𝗻. This new capability adds native support for UTXO-based chains like @Bitcoin, @litecoin, and @CantonNetwork, allowing developers to run concurrent transfers safely and reliably. Behind the scenes, Dfns now reserves UTXOs during transaction construction. This prevents multiple processes from selecting the same inputs and eliminates issues like conflicting transactions, unintended Replace-By-Fee replacements, or failed broadcasts. For teams building payments, exchanges, treasury systems, or wallets,  this removes the need to build custom UTXO locking logic in your application and makes transaction pipelines far more predictable. It’s part of our broader effort to build a unified transaction resource management layer across blockchains. If you’re building on Bitcoin-style networks, this matters. 📑 Read the full story here: dfns.co/article/utxo-s…

Stablecoins are getting all the attention right now. But the uncomfortable truth is that most consumers don’t care about payment infrastructure. They care about the assets they want to own 📈 In his latest blog post, our CPO Chris Sutton makes a simple but important argument: “𝘛𝘩𝘦 𝘧𝘪𝘳𝘴𝘵 𝘰𝘯𝘤𝘩𝘢𝘪𝘯 𝘱𝘳𝘰𝘥𝘶𝘤𝘵 𝘣𝘢𝘯𝘬𝘴 𝘴𝘩𝘰𝘶𝘭𝘥 𝘭𝘢𝘶𝘯𝘤𝘩 𝘪𝘴𝘯’𝘵 𝘴𝘵𝘢𝘣𝘭𝘦𝘤𝘰𝘪𝘯 𝘱𝘢𝘺𝘮𝘦𝘯𝘵𝘴. 𝘐𝘵’𝘴 𝘽𝙪𝙮 / 𝙎𝙚𝙡𝙡 / 𝙃𝙤𝙡𝙙.” Why? Because crypto has quietly become part of millions of people’s portfolios. Bitcoin now sits next to stocks, ETFs, and savings accounts as another category of wealth 💲 And when that happens, customers start asking a very simple question: 𝗜𝗳 𝗺𝘆 𝗯𝗮𝗻𝗸 𝗹𝗲𝘁𝘀 𝗺𝗲 𝗯𝘂𝘆 𝗲𝗾𝘂𝗶𝘁𝗶𝗲𝘀, 𝘄𝗵𝘆 𝗰𝗮𝗻’𝘁 𝗶𝘁 𝗹𝗲𝘁 𝗺𝗲 𝗯𝘂𝘆 𝗰𝗿𝘆𝗽𝘁𝗼? In the article, Chris breaks down: ✔️ Why stablecoins are infrastructure, not a consumer product ✔️ Why Buy/Sell/Hold is the most natural starting point for banks ✔️ The strategic risk of letting fintechs own the crypto relationship ✔️ What infrastructure banks actually need to launch it ✔️ Why this use case becomes the foundation for the entire onchain banking stack Once the wallet infrastructure exists, everything else becomes possible: payments, transfers, lending, tokenized assets, settlement, clearing, trading, staking, and much more. The question is simply 𝘄𝗵𝗲𝗿𝗲 𝗯𝗮𝗻𝗸𝘀 𝗰𝗵𝗼𝗼𝘀𝗲 𝘁𝗼 𝘀𝘁𝗮𝗿𝘁 🔎 📑 Read the full piece: dfns.co/article/buy-se…

🔊 We’re hiring at @dfnsHQ! If you want to work on infrastructure powering the next generation of financial systems, we have several open roles across Sales, Engineering, Security, and Legal. 𝗦𝗮𝗹𝗲𝘀 🇪🇺 VP Institutional Sales, EMEA (Europe) 🇺🇸 VP Institutional Sales, US (New York) 🇺🇸 VP Fintech, US (San Francisco) 🇪🇺 Strategic Account Manager (Europe) 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 🇺🇸 Principal Software Engineer (New York) 🇭🇰 Principal Software Engineer (Hong Kong or Singapore) 🇪🇺 Principal Software Engineer (Europe) 🇺🇸 Senior Software Engineer (United States) 🇺🇸 Senior Blockchain Engineer (United States) 🇺🇸 Senior Infrastructure Engineer (United States) 🇺🇸 Lead Mobile Engineer (United States) 🇺🇸 Principal Security Engineer (United States) 🇺🇸 Principal Solutions Engineer (United States) 𝗟𝗲𝗴𝗮𝗹 🇫🇷 Commercial Counsel (Paris) If you’re interested in working on cryptography, wallet infrastructure, distributed systems, and financial technology, you can explore the roles here: jobs.deel.com/job-boards/dfns Or feel free to reach out directly.

Stablecoins solved settlement. But the moment you need to leave the chain, things get complicated… Local rails, FX, compliance checks, beneficiary verification, and corridor-specific quirks 🛑 Today we’re introducing 𝗗𝗳𝗻𝘀 𝗣𝗮𝘆𝗼𝘂𝘁𝘀 💸 Our new Payouts API let you convert stablecoins to fiat and settle payouts to bank accounts in 𝟵𝟰 𝗰𝗼𝘂𝗻𝘁𝗿𝗶𝗲𝘀 through a single workflow. The first integration is powered by Borderless.xyz, giving global payout coverage to our clients while keeping Dfns as the control plane for authorization, signing, transacting, tracing, and more. Instead of the typical “1 wallet + 1 payout provider” vertical stack, we’re building a horizontal, marketplace-friendly model where routing and authorization are separate systems. ✅ 𝗕𝗲𝘁𝘁𝗲𝗿 𝗽𝗿𝗶𝗰𝗲𝘀: Real price discovery and competition between payout providers. ✅ 𝗠𝗼𝗿𝗲 𝗶𝗻𝗱𝗲𝗽𝗲𝗻𝗱𝗲𝗻𝗰𝗲: More choice, no vendor lock-in, and the ability to re-route transactions. ✅ 𝗠𝗼𝗿𝗲 𝗿𝗲𝘀𝗶𝗹𝗶𝗲𝗻𝗰𝗲: Stronger business continuity and availability, no single-provider dependency. ✅ 𝗠𝗼𝗿𝗲 𝗹𝗶𝗾𝘂𝗶𝗱𝗶𝘁𝘆 𝗮𝗰𝗰𝗲𝘀𝘀: Stablecoin-to-fiat payouts to bank accounts for 60+ currencies. If you’re building stablecoin payment rails and don’t want your payout stack welded to a single provider, this is for you. In short, programmable payout orchestration with institutional-grade wallet controls. 📑 Learn more about Payouts: dfns.co/article/introd…