🇵🇹 — ETH Lisbon Recap

During 3 days (October 28 - 30), hackers from around the world gathered at the Academia das Ciências in Lisbon for hacking. Here is an in-depth look at the winning projects.

🇵🇹 — ETH Lisbon Recap

During 3 days (October 28 - 30), hackers from all over the world gathered at the Academia das Ciências in Lisbon for hacking. For this occasion, we sponsored 3 open bounties for bold hackers eager to build on Fuel Beta-1 testnet using Sway:

  • 🥇 First Prize — $3,000
  • 🥈 Second Prize — $2,000
  • 🥉 Third Prize — $1,000

🏆 The winners

Let's go over the winning projects:

🥇 First Prize — Authsome

Authsome implements a multi-signature wallet using the predicate system of the FuelVM and Sway. This wallet is then used as the basis for a pluggable authentication infrastructure, similar to Web3Auth.

Fuel Predicates

Fuel predicates work in a similar way to scripts for pay-to-script-hash (P2SH) transactions in Bitcoin. This offers a number of important advantages over implementing account abstraction on the smart contract layer:

  • Reduced gas cost, as signature aggregation can be done off-chain and verification can be done as a single step without smart contract function calls;
  • Improved flexibility, because different signature schemes can be swapped in by implementing them as on-chain smart contract libraries and using them in predicates; and
  • Minimal state bloat, because predicate byte code is processed once as part of the transaction validation, and then discarded - thus never entering the blockchain state.

This project leverages the power of account abstraction and multi-signatures to create Web2-like experiences with Web3 custodial properties.

Check out their demo video below:

How does it work?

You first need to log in with an email address and a password of your choice. Authsome will then generate a 2 of 3 addresses multi-signature wallet, which means that you need 2 addresses to execute a transaction or log in to Authsome. Each key will be stored in different places.

Then you're all set to execute blazingly fast payments: You log in with your password to unlock the first key, and the second key is loaded from your browser's local storage.

When you confirm your transaction on the Frontend, the DApp will generate a two-signature predicate transaction for each spended UTXO.

The real benefit of this application is that it supports spending multiple UTXOs with distinct predicate data.

For more information, check out their GitHub repository.

🥈 Second Prize — Fuel Price Oracle

Fuel Price Oracle implements a simple ETH - DAI tokens price oracle. This project allows retrieving token prices from the outside world on the Fuel chain with a Sway smart contract.

Check out their demo video below:

For more information, check out their GitHub repository.

🥉 Third Prize — Capitalist Pigs

Enter the world of Capitalist Pigs, a Gamify staking for fees in a DeFi project using a set of NFTs.

Check out their demo video below:

How does it work?

First of all, you begin by generating a burner wallet on the upper right corner of the DApp. To start playing, you need to claim a Pig, a stakable collectible NFT asset. By staking it, you will earn Truffles and staking fees represented by Bacon. Truffles can be turned into Piglets. With those Piglets, you have 2 possibilities: you can either turn them into Pigs or delegate them to existing Pigs to increase their staking fee generation. And this is it, you're a Capitalist Pig! You can check in the lower right corner the evolution of your supply (Pigs, Piglets, Truffles, and Bacon).

Try it out now here.

For more information, check out their GitHub repository.

Start Building On Fuel Today

Building on Fuel means breaking free from the constraints of monolithic blockchains that have held us back.

Developer Resources for Building with Fuel

  • A step-by-step guide to building a full-stack dapp on Fuel can be found here.
  • The Fuel Book can be found here. It contains everything you need to know about Fuel, from its modular design to its key features.
  • The Sway Book can be found here.

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Fuel is the fastest execution layer for the modular blockchain stack. Powerful and sleek, the technology enables parallel transaction execution, empowering developers with the highest flexible throughput and maximum security required to scale. Developers choose the FuelVM for its superior developer experience and the ability to go beyond the limitations of the EVM.

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