April 11-12, 2026 - Paris
Powered by XRP Ledger | Supported by XRPL Commons & Kryptosphere
Welcome to Hack the Block, the flagship hackathon of Paris Blockchain Week!
100+ developers from around the world will have the opportunity to turn their ideas into real blockchain solutions over 24 hours of hacking.
Register to Hack | Hackathon Presentation Page
La FaΓ―encerie
- 18 rue de Paradis, 75010 Paris.
- Open overnight from Saturday to Sunday
Build on XRPL to create apps that power real users, businesses, and value flows. Focus on payments, realβworld assets, or institutional DeFi, driving recurring transactions, sustainable TVL, and measurable ecosystem growth.
Build an XRPL application that offloads heavy computation to the Boundless prover network and verifies the results trustlessly on-chain.
Build an XRPL application that leverages the Quicknode on demand infrastructure and primitives in the most innovative way.
Put blockchain at the service of social and environmental impact, fight climate change, democratize access to finance for the most excluded populations, and ensure that this technology benefits the common good above all.
Launch a live product on XRPL during the hackathon. The winner is whoever drives the most real on-chain users before time runs out. Just traction.
Build the most visually stunning XRPL experience, 2D, 3D, generative, immersive, art, or something we haven't seen yet. Impress us before we even read the code.
The most unexpected, bizarre, or delightfully absurd XRPL project wins. We don't know what we're looking for, and neither do you. Yet. Forget best practices, think outside the ledger.
| Prize | Amount |
|---|---|
| 1st Place | 2,500 EUR |
| 2nd Place | 1,500 EUR |
| 3rd Place | 1,000 EUR |
Additional prizes will be awarded as follows. These prizes can be cumulated with main prizes.
| Prize | Amount |
|---|---|
| Impact bounties - Outstanding | 1,500 EUR |
| Impact bounties - Honors | 1,000 EUR |
| Boundless bounty | 1,000 EUR |
| Quicknode bounty | 1,000 EUR |
| Zero to Users | 1,000 EUR |
| Pixel Meets Chain | 1,000 EUR |
| Why Not? | 1,000 EUR |
Total prize pool: 12,500 EUR
| Time | Event |
|---|---|
| 08:30 - 09:00 AM | Doors open & Breakfast |
| 09:30 - 10:00 AM | Welcome Speeches |
| 10:00 AM | Let's Hack! - Official hackathon launch |
| 10:00 - 11:00 AM | Team leads revolving pitch |
| 11:00 - 12:00 AM | Workshops |
| 12:00 PM | Team Constitution deadline |
| 01:00 - 02:00 PM | Lunch break |
| 04:00 - 05:00 PM | Hack the Mentor: office hours |
| 07:00 - 08:00 PM | Dinner break |
| 09:00 - 09:30 PM | Wake-up the Hacker Activity |
| 10:30 PM | Overnight Coding Fun |
| 10:30 PM | Doors close, No re-entry |
| Time | Event |
|---|---|
| 08:30 - 10:00 AM | βοΈ Coffee & Breakfast |
| 11:00 - 11:30 AM | Hack the Mentor (Office hours) |
| 01:00 PM | Final Project Submission |
| 01:00 - 02:00 PM | Lunch break |
| 02:00 - 03:00 PM | First Round Team Pitches |
| 03:30 - 03:40 PM | Group Photo |
| 03:40 - 04:30 PM | Snack time (surprise) + Jury Deliberation |
| 04:30 - 05:30 PM | Winner Pitches & Closing Ceremony |
| 05:30 - 07:30 PM | Cocktail |
| 08:00 PM | Closing |
-
A link to your repository, which must be publicly accessible.
-
A short text presenting the main idea of your project: what it is about, what its objective is, and addressing the following questions:
What real-world problem does your project aim to solve? Why is it important?
How can your solution scale beyond the hackathon? Does it have the potential for broader adoption?
Specify the XRPL features used. Does your project effectively leverage XRPL's blockchain capabilities?
Estimate the potential volume of real-world transactions your solution could generate on the XRPL.
- A link to a video or screenshots showcasing your solution.
- Build on the XRPL Testnets at your disposal.
- All projects must submit transactions to the L1.
- Using a sidechain such as Xahau or the XRPL EVM Sidechain is allowed.
Project evaluation will be based on four main criteria, each carrying equal weight in the final score:
- Idea (the originality of the concept)
- Implementation (the quality of the code and robustness of the architecture)
- Demo (how clearly you present your solution to the user)
- Potential (strength of the business model and ability to generate meaningful on-chain value)
Projects will got through 2 rounds of pitching. Before you pitch, one of our mentors will conduct a technical review which is essentially a Q&A with your dev(s).
You must prepare a 5 minute pitch with demo and be ready for a 2 minute Q&A.
Fast pitching round (2PM-3PM on Sunday) You will present to 2-3 judges. You will have 3 minutes to pitch and demo your product. Focus only on the problem you are solving and then demo your solution. Skip other content if needed to make sure you get to the live demo.
If you are selected you will get to pitch in front of everyone on the main stage.
Main Stage You will present in front of all the judges. You will have 5 minutes to pitch and demo your idea. Here you can hit the team and business opportunity and do the full sotrytelling. You will want to demo your product again. Demo videos are OK.
- Denis Angell (XRPL Labs) Technology
- Melanie Dinane (42 Paris) Business
- Eva Mirza (DeVinci Blockchain) Technology
- Sylvain Verron (EM Lyon / ESDES) Business
- Martino Bettucci Technology
- Mark-Killian Zinenberg (Kryptosphere) Technology
- Germain Gaschet (Sharpstone Capital) Business
- Andrew "Handy Andy" Spencer Technology
- Panos Technology
- Emiliano Bonassi (Boundless) Technology
- Roman Terekh (QuickNode) Technology
- David Bchiri (XRPL Commons) Technology and business
- Ray Fuentes Engagement
- Shane Calder (132 ENG Inc) Technology
- Atharava Lele (Trinity College Dublin) Technology
- Denis Angell (XRPL Labs) Technology
- Andrew "Handy Andy" Spencer Technology
- Panos Technology and business
- Luc (XRPL Commons) Technology and business
- Thomas (XRPL Commons) Technology
- Mathis (XRPL Commons) Technology
- Florian (XRPL Commons) Technology
Each team is assigned a unique XRPL SourceTag following the format 2026040000 + N, where N is the team number. This encodes the year and month (April 2026) and identifies the team in on-chain transactions. Teams are numbered in order of registration.
| # | Team | SourceTag |
|---|---|---|
| 1 | Nada & Sammie | 2026040001 |
| 2 | Proof of stake(42) | 2026040002 |
| 3 | HerVoice | 2026040003 |
| 4 | FoxHound | 2026040004 |
| 5 | 42Blockchain | 2026040005 |
| 6 | Team cassino | 2026040006 |
| 7 | clauDEX | 2026040007 |
| 8 | Tamagoscii | 2026040008 |
| 9 | Megawatt Finance | 2026040009 |
| 10 | u2p050 | 2026040010 |
| 11 | Emayan | 2026040011 |
| 12 | Armand-le-goat | 2026040012 |
| 13 | OFVA | 2026040013 |
| 14 | ImportEx | 2026040014 |
| 15 | Clim | 2026040015 |
| 16 | XRPandables | 2026040016 |
| 17 | ShelTr | 2026040017 |
| 18 | β‘οΈπ¦βπ | 2026040018 |
| 19 | dbs | 2026040019 |
| 20 | Test111 | 2026040020 |
| 21 | XPerp | 2026040021 |
| 22 | Xrp402 | 2026040022 |
| 23 | TBD | 2026040023 |
| 24 | PayTheTalent | 2026040024 |
| 25 | Youkiiiii | 2026040025 |
| 26 | XRP hack the block | 2026040026 |
| 27 | DeSerT_812 | 2026040027 |
| 28 | Physics is the limit. | 2026040028 |
| 29 | Not A Rug-Pull | 2026040029 |
| 30 | Obol | 2026040030 |
| 31 | HestiaX | 2026040031 |
| 32 | Carro | 2026040032 |
| 33 | SlainAds | 2026040033 |
| 34 | Rexios | 2026040034 |
| 35 | Legasi | 2026040035 |
| 36 | FinAura | 2026040036 |
| 37 | Mise En Block | 2026040037 |
| 38 | Edel-ID | 2026040038 |
| 39 | Qaf | 2026040039 |
| 40 | ChainVision | 2026040040 |
| 41 | ApprovID | 2026040041 |
On XRPL, SourceTag is an optional unsigned 32-bit integer field you add to a transaction (most commonly a Payment). It's a hint for the sender's side β often used to tag the originating user, app, or campaign.
In a transaction JSON:
{
"TransactionType": "Payment",
"Account": "r...",
"Destination": "r...",
"Amount": "1000000",
"SourceTag": 12345
}With xrpl.js:
const prepared = await client.autofill({
TransactionType: "Payment",
Account: wallet.address,
Destination: "r...",
Amount: xrpl.xrpToDrops("1"),
SourceTag: 12345,
})Notes:
SourceTagβDestinationTag.DestinationTagidentifies a recipient sub-account (e.g. on an exchange);SourceTagidentifies the sender side.- Range:
0to2^32 β 1. - It's stored on-ledger and visible to anyone, so don't put secrets in it.
- If you're tagging payments for attribution/analytics across an ecosystem, pick a stable integer per source and document it somewhere your team can find.
Hack the Block Opening Ceremony
Network name: Teach-Albert
Password: @Ugk65kzma
| XRPL Commons Products | Starter tools, templates, and developer resources | products.xrpl-commons.org |
| create-xrp | CLI tool to scaffold a new XRPL project | npx create-xrp |
| Hackathon Ideas | Project suggestions to get inspired for hackathons | XRPL Hackathon Idea List |
| Quick Start Activities | Guided coding activities for hands-on learning | XRPL Commons Tutorials |
| Transaction Quick Reference | All XRPL transactions and payloads | XRPL transaction types |
| Faucets to get XRP and RLUSD | Fund test wallets with XRP and RLUSD | XRP Faucets RLUSD Faucets |
| YouTube Tutorials | Video guides for beginners and developers | XRPL Commons YouTube Channel |
| Official Docs | Main reference for everything XRPL | XRPL Documentation |
| Learn the Basics | Interactive platform to explore XRPL fundamentals | XRPL Learn Platform |
| Ripple USD Stablecoin Docs | Reference and documentation of Ripple USD Stablecoin | Ripple USD Stablecoin Docs |
| XRPL Explorer | Explore accounts, transactions, and ledgers on XRPL | XRPL Explorer XRPLWin Explorer |
| Wallets, Escrows, Tickets | Practical tutorials on creating wallets, trustlines, escrows and tickets | Florian Uzio Guides |
| Quicknode Access for XRPL Builders | QuickNode is offering Hack the Block 2026 participants two months of free credits ($49/month) to help them build on XRPL during and after the hackathon. | Quicknode for XRPL builders |
| XRPL Boundless Integration | A starter kit for developing XRPL Smart Escrows with RISC0 proof integration | XRPL + RISC0 Starter |
