Arbitrum Day – Brazil Chapter at ETH Latam São Paulo 2025

DAO Programs & Initiatives Domain Allocator Offerings (prev Questbook)
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We’re opening this thread to share updates on the Arbitrum Day - Brazil Chapter, an initiative supported by the Arbitrum DAO via Domain Allocator.

This event will be a full-day Arbitrum event on November 9 within ETH Latam São Paulo 2025. We’d love to collaborate with the Arbitrum community to create it.

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About ETH Latam

ETH Latam is a nonprofit initiative focused on strengthening the Ethereum ecosystem in Latin America through regional gatherings, open education, and collaborative ecosystem-building.

The event is organized by ETH Kipu, with the support of many local contributors. For this edition, we’re proud to count on a strategic partnership with ETH Samba. This group is leading the design and execution of the hackathon.

Previous editions of ETH Latam took place in Buenos Aires, Bogotá, and San Pedro Sula. This will be our fourth edition.

Arbitrum Day - Brazil Chapter at ETH Latam São Paulo 2025

Arbitrum Day will be held on November 9 in São Paulo. The goal is to connect Arbitrum with Brazil’s fast-growing momentum in RWA, tokenization, and stablecoin infrastructure.

The program will feature:

  • Panels and talks about Arbitrum
  • Presentations from builders leveraging Arbitrum in Latin America
  • Strategic dialogues around compliance, real-world assets, and public infrastructure
  • Pitch from the builders who worked on Arbitrum during the hackathon

This will be a space to showcase how Arbitrum can power real-world solutions in Latin America’s largest economy and how the community can grow locally with long-term impact.

Why Brazil? :brazil:

Brazil is not only the largest economy in Latin America but also a growing hub for real-world blockchain experimentation, institutional adoption, and on-chain infrastructure development. For Arbitrum, this presents a strategic opportunity to deepen its presence, support emerging use cases, and contribute to a vibrant, rapidly evolving ecosystem.

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Source.

Some signals that illustrate Brazil’s momentum:

:hammer_and_wrench: Rayls + Arbitrum Integration

Rayls, an infrastructure initiative born in Brazil, is being developed by Parfin, a key technology partner to the Central Bank of Brazil on digital asset security. In early 2025, it was announced that Rayls will integrate with Arbitrum, using it as the public aggregator network for various subnets already deployed in initiatives like Drex (Brazil’s CBDC infrastructure) → Source

“We chose Arbitrum because it’s the most established player in the L2 space. The code is clean and lightweight, the block time is fast, and the team is highly engaged — we even got to meet CEO Steven Goldfeder,” said Alex Buelau, CPTO and co-founder of Parfin.

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Rayls is also the base layer powering the Nuclea Chain, a new digital assets initiative by Núclea, Brazil’s leading digital infrastructure operator.

:link: Núclea: Scaling Transaction Infrastructure into Digital Assets

With over 20 years of experience, Núclea currently handles:

  • 90% of card transactions in the country
  • 29 billion transactions processed in 2023, totaling over R$18 trillion

Now, the company is extending its infrastructure expertise to the digital economy, leading blockchain initiatives like Drex and Real Digital. → More on Nuclea Chain

:money_bag: Mercado Bitcoin + Plume: $40M in Tokenized RWAs

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Brazil’s largest crypto exchange, Mercado Bitcoin, has partnered with Plume Network to tokenize $40 million in RWAs, creating a direct onchain bridge between global capital and yield-generating opportunities in Brazil. → Read the full announcement

:bar_chart: Institutional Maturity and National Mapping

Brazil has also launched the Federal Blockchain Observatory, mapping hundreds of blockchain and crypto-related initiatives nationwide. → Explore the interactive map

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Additionally, organizations like ABToken and ABCripto bring together banks, exchanges, fintechs, and startups to advance public-private collaboration.
→ abtoken.com.br
→ abcripto.com.br

:globe_showing_europe_africa: Community Growth, Content & Ambassadors

Arbitrum’s presence in Brazil has also grown through grassroots efforts. With the leadership of @JoaoKury as LatAm Community Lead and a network of 60+ ambassadors, the ecosystem has seen a surge in localized content production, video creation, and educational resources in Portuguese.

Let’s build together!!!

We’ll use this thread to share ongoing updates as we move forward.

We also invite you to collaborate by suggesting speakers, contributing to the agenda, or simply spreading the word.

:blue_heart: Feel free to propose your talk, workshop, or panel related to Arbitrum here: ETH Latam Brazil 2025 - Apply to speak!

Thanks again to the Arbitrum DAO and the Domain Allocators for your support.
We’re looking forward to co-creating something meaningful with you all.

Feel free to DM me on Telegram @Cryptochica_arg

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Milestone 01: Initial Commitments: Venue and Catering :white_check_mark:

We’re happy to report that Milestone 01 has been completed:

:check_mark: Venue reserved: The Auditório Modular at the State Innovation Center (São Paulo) is confirmed for November 9, with 12-hour exclusive access, basic A/V infrastructure, cleaning, and support services.

:check_mark: Confirmed catering provider for light food and beverage service

:classical_building: About the Venue: State Innovation Center

The Arbitrum Day will take place at State Innovation Center, a repurposed 1940s industrial facility in Sao Paulo. It is now a leading hub for urban innovation, technology, and open collaboration between startups, enterprises, and civic organizations.

State offers:

  • Over 10,000 m² of total space
  • Areas dedicated to innovation labs, research, and tech startups
  • Events infrastructure for 10 to 500 attendees
  • A mission to foster solutions that improve urban life in Brazil

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:microphone: About the Auditório Modular

The Auditório Modular, where the Arbitrum Day will be hosted, features:

  • Capacity for up to 280 seated attendees
  • Fixed stage, 4.3m ceiling height, and 340 m² of space
  • Dedicated 115 m² foyer for networking and circulation
  • Two projectors (5000 lumens), wireless microphones, 8-channel soundboard, and HDMI splitters
  • Internet WiFi, A/V tech support, slide remote, and on-site staff
  • Support tables for catering, and coffee/tea/water available during the event

Auditorium State Innovation Center
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This setting will allow us to host high-quality panels, project pitches, and community interactions with professional infrastructure and the atmosphere we want for Arbitrum Day in Brazil.

We also invite you to collaborate by suggesting speakers, contributing to the agenda, or simply spreading the word.

:blue_heart: Feel free to propose your talk, workshop, or panel related to Arbitrum here: ETH Latam Brazil 2025 - Apply to speak!

Thanks again to the Arbitrum DAO and the Domain Allocators for your support.
We’re looking forward to co-creating something meaningful with you all.

Feel free to DM me on Telegram @Cryptochica_arg

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Milestone 02 | Pre-Event Assets: Content, Booth, Swag, and Outreach :white_check_mark:

We’re happy to report that Milestone 01 has been completed:

:white_check_mark: At least 40 ecosystem partners confirmed (25 from Brazil)

Regarding this requirement, we’re happy to share that with 104 days to go until the event, we already have over 50 confirmed partners, including 29 based in Brazil.

We’ve observed that some institutional partners require more time and internal processes to confirm, while others tend to finalize their involvement closer to the event date. That said, the network is solid and growing steadily.

Categories:

  • Institutional: 14
  • Community: 6
  • Education: 5
  • Ops: 2
  • Social: 1
  • Event: 1

Cities:

  • São Paulo: 13
  • Rio de Janeiro: 4
  • Bahía: 3
  • Belo Horizonte: 3
  • Florianópolis: 2
  • Recife: 2
  • Mina Gerais: 1
  • Curitiba: 1

We will update the partner list as we move forward and are happy to share the full partner sheet: Ecosystem Partners, Schedule and Bootcamps - Google Sheets

:white_check_mark: Speaker outreach and onboarding (manual speaker, logistics guide included)

We’ve prepared a Speaker Manual to support everyone contributing to the Arbitrum Day with helpful information on logistics, key dates, and coordination. Although the document will be distributed once we start confirming speakers, it is already available and includes everything from travel guidelines to presentation logistics.

Additionally, we’ve partnered with Block Travel Agency to assist any confirmed speaker or participant attending the ETH Latam / Arbitrum Day who may need help with travel or accommodation. Just reach out directly through the platform to request support.

:white_check_mark: Final delivery of the Arbitrum booth and stage renders for Arbitrum Day.

We’ve finalized the booth and stage renders for Arbitrum Day. As requested, we’ve applied the official Arbitrum DAO branding and combined it with the ETH Latam branding (special thanks to the creators featured here https://x.com/ArbitrumDailyTK/status/1742545443312087369).

The venue allows for two possible stage setups:

  1. A traditional format with the stage against the wall
  2. A 360° central stage.

Traditional format:

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360° central stage

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:white_check_mark: Final designs for swag, including Arbitrum’s logo.

For this milestone, we’ve designed a high-quality tote bag that attendees can use to carry any swag they receive during Arbitrum Day / ETH Latam while also giving visibility to the Arbitrum brand. We aimed to create something functional and durable so participants could keep using it beyond the event in their daily lives.

The design blends English and Portuguese to resonate with local Brazilian attendees and the broader international audience.

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:white_check_mark: Pre-event social media campaign with three promotional posts.

X: @ETHLatam

Fun fact: Tomasz K. Stańczak RT the announcement, helping amplify visibility to the broader Arbitrum Day :grinning_face:

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Instagram: @ethlatam

LinkedIn – ETH Latam

:woman_raising_hand: Personal Amplification

As lead organizer, I’ve also contributed to amplifying the message through my personal account:

We invite the Arbitrum community to stay connected and follow our updates across platforms and to join our growing X community to collaborate, suggest ideas, and get involved:
:backhand_index_pointing_right: https://x.com/i/communities/1914717066180833434

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Hi everyone!
Some updates from our side as we move closer to ETH Latam (Nov 6–9 in São Paulo, the stopover before Devconnect):

:white_check_mark: Hackathon applications are now live → https://x.com/ethlatam/status/1956014875596963897
:white_check_mark: Conference tickets are open → https://x.com/ethlatam/status/1957806134598807887

We’re already onboarding hackers and attendees, and also connecting with projects to help us co-create the agenda for the Arbitrum Day - Brazil Chapter on November 9. The goal is to highlight builders, infra, and adoption stories in a region where Arbitrum has vast potential but hasn’t yet had an intense spotlight.

At the same time, the Brazilian crypto landscape is heating up with significant developments:

  • Bitcoin sovereign reserve: Today (August 20), the Economic Development Committee of Congress held its first public hearing on a proposal to create a $19B strategic Bitcoin reserve. Representatives from Treasury, Central Bank, Febraban, Méliuz, MDIC, and ABCripto presented different perspectives, from Bitcoin’s scarcity and role as a potential reserve asset to concerns about volatility, monetary policy, and regulation. The debate will continue in further sessions. (Source: CryptoSlate)

  • Capital markets on blockchain: Last week at Blockchain Rio, the CVM (Brazil’s securities regulator) introduced “135 Lite”, a simplified version of Resolution 135. This could open the door for central depositories like B3 (Brazil’s leading stock exchange) to adopt blockchain/DLT as official infrastructure starting in 2026. The plan is to launch a public consultation later this year, expecting to lower costs, increase efficiency, and create room for tokenized assets and new players in capital markets. *(Source: Criptofacil)
    *
    :up_arrow: That is a big opportunity for Arbitrum. :up_arrow:

Both discussions show how fast things are moving in Brazil, from Bitcoin as a potential sovereign reserve to blockchain being considered core financial infrastructure.

That’s the environment where Arbitrum Day will take place, and that is why we believe Brazil is one of the most relevant ecosystems to watch right now.

I’m happy to answer questions or share more details. If anyone here is considering joining the hackathon or Arbitrum Day, please DM Telegram: Contact @cryptochica_arg .

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Milestone 03 | Operational Planning - Agenda & Workshop :white_check_mark:

Hello everyone,

We’re delivering this milestone later than expected, as we were waiting on confirmations from third parties outside our team. Since some of these responses have not yet arrived, we’ve decided to move forward and present this milestone now.

:white_check_mark: Finalization of the Arbitrum Day agenda and speaker lineup

Link here.

The agenda is nearly finalized. We are still awaiting confirmations from a few companies that, in addition to being active builders on Arbitrum, are also potential sponsors of our event. The name of the final speaker from this team’s participation depends on internal availability and commitments to other events.

We’ve aimed for a diverse program to attract different audiences, balancing governance, payments, RWA, and developer talks and panels. We also tried to include Arbitrum ambassadors in Brazil, but we were informed that any activity by ambassadors requires prior authorization from the Arbitrum Foundation. This has limited their involvement for now.

:white_check_mark: Coordination of booth setup and logistics

Our production company, Acaso, has already begun working on the booth execution based on previously shared renders. We will post more pictures in 2 weeks.

:white_check_mark: Final content for the pre-hackathon workshop

Link here.

The workshops will be led by Solange Gueiros, the ETH Samba lead and ETH Latam hackathon coordinator. She also created the content selection for builders.

:large_blue_diamond: Online workshop pre-event 30’ :right_arrow: October 23rd, Google Meet & Youtube broadcast:

Developing on Arbitrum: this day focuses on practical development: building NFTs, integrating oracles, and adopting the best tools for efficient dApp development.

  1. NFTs on Arbitrum
    Introduction to NFT standards (ERC-721, ERC-1155) and why deploying NFTs on Arbitrum is cheaper and faster than on Ethereum mainnet.

  2. How to Create an NFT on Arbitrum
    Hands-on tutorial to design, mint, and deploy your first NFT collection. Includes metadata handling and integrating with marketplaces like OpenSea.

  3. Oracles on Arbitrum
    Understand the importance of oracles in dApps and DeFi. Learn how to integrate Chainlink into Arbitrum smart contracts for real-world data feeds and other types of Oracles available on Arbitrum.

  4. Tools and Resources to Speed Up Development
    Explore frameworks and developer tools that make building on Arbitrum faster: Hardhat plugins, Alchemy/Infura endpoints, block explorers, debuggers, and boilerplate codebases.

:large_blue_diamond: Workshop at the event (IRL) :right_arrow: November 6th, Aquario 1, State Innovation Center.

Arbitrum Onboarding
This session is designed to help developers and enthusiasts get started with Arbitrum, understand how Arbitrum works and its ecosystem, and set up the right tools for development.

  1. Arbitrum Introduction
    Learn what Arbitrum is, why it’s one of the leading Ethereum Layer 2 solutions, and how it scales Ethereum with optimistic rollups. We’ll cover its benefits, ecosystem, and real-world use cases.

  2. Resources to Create dApps on Arbitrum
    Explore the best documentation, SDKs, tutorials, and community resources available to start building decentralized applications on Arbitrum quickly.

  3. Preparing Your Environment to Develop
    Step-by-step guide to setting up your local environment: wallets, testnet faucets, and Arbitrum-specific network configurations.

  4. Create Your First Smart Contract on Arbitrum
    Hands-on session to deploy a simple smart contract (e.g., a counter or storage contract) to Arbitrum testnet, walking through compilation, deployment, and interaction.

  5. How to Create a Token on Arbitrum
    Learn how to design and deploy an ERC-20 token on Arbitrum. Understand token standards, gas optimizations, and how tokens behave on Layer 2 networks.

:white_check_mark: Announcement of João Kury and Ricardo Gordon as ETH Latam main stage speakers

These announcements were already included in the previous milestone to generate earlier engagement.

Next steps and open questions

We are about to start working with a PR firm to amplify ETH Latam and Arbitrum Day across Brazil and LatAm. Since Arbitrum is one of the main sponsors, it would be valuable to have a direct contact (person or team) who can advise us on what the DAO/ecosystem wants to communicate.

Please note: this cannot be sourced from the Arbitrum Foundation due to conflicts of interest, as the DAO directly funds this initiative. If no dedicated contact is available, we will proceed in good faith and communicate what we believe best represents Arbitrum’s contributions to Brazil.

Would you like to be a speaker at Arbitrum Day Brazil Chapter?
Please note that the deadline for speaker registration is September 26.
Speakers: ETH Latam Brazil 2025 - Apply to speak!

Thanks again for your trust and support.

I’m happy to answer questions or share more details. Telegram: Contact @cryptochica_arg

ETH Latam team

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Arbitrum Day – Brazil Chapter

Final Report

Milestone 04 | Onsite Execution – Hackathon, Conference & Arbitrum Day + Milestone 05 | Post-Event Wrap Up

Executive Summary

A panel at the Arbitrum Day
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Arbitrum Day - Brazil Chapter was held on November 9 as part of ETH Latam São Paulo 2025, a four-day program positioned strategically ahead of Devconnect Buenos Aires. ETH Latam gathered 1,800 participants from more than 27 countries, including developers, founders, researchers, institutions, VCs, companies, and students.

The Brazil Chapter was designed to offer Arbitrum a high-visibility and high-context presence in the largest and most influential crypto market in Latin America. Throughout the event, Arbitrum maintained strong positioning through technical programming, on-site activation, hackathon engagement, media visibility and direct interaction with the broader Ethereum community.

More than 200 participants attended Arbitrum Day sessions throughout the program, and the Arbitrum-branded presence was sustained throughout the entire ETH Latam week.

Arbitrum Presence at ETH Latam São Paulo 2025

Visibility and Branding

Arbitrum maintained continuous visibility across the venue through stage design, signage, printed materials and branded totebags distributed to all participants.

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Venue production was executed by Acaso, a São Paulo–based agency responsible for stage construction, decoration, assembly and teardown.

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Community Engagement

Across the day, more than 200 participants attended Arbitrum sessions, including developers, operators, founders, researchers, and institutional representatives. Arbitrum maintained a strong presence across all four days of ETH Latam through:

  • branded materials
  • participation in the main conference
  • hackathon incentives
  • technical workshops
  • ambassador engagement
  • continuous media and social visibility

We had the pleasure of welcoming Vitalik Buterin to the venue on the day of Arbitrum Day, his first visit to Brazil. His presence generated significant community interest throughout the venue and contributed to the day’s unique atmosphere.

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Vitalik talking with Joao Kury, Latam Community at Arbitrum
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Media Coverage and Social Amplification

Arbitrum benefited from extensive visibility across regional media outlets and social channels.

Social media coverage included:

  • Community recaps
  • Ambassador-led content
  • Speaker publications
  • Reels and videos from ecosystem partners
  • PT and ES content promoting Arbitrum programming

Press coverage (coordinated with Sherlock Communications):

  • BeInCrypto (BR and ES editions)
  • LatamBlocks
  • Yahoo Finance
  • Additional Brazilian media outlets covering ETH Latam and Arbitrum’s role

Newsletters:

  • Blockchain Rio (20,000+ subscribers)
  • POK (distributed to 1,200 universities)

Streaming

A five-hour livestream of Arbitrum Day sessions expanded reach to international audiences:

https://x.com/i/broadcasts/1YqGolWZOOgJv?s=20

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Arbitrum Day Schedule

Arbitrum Day included technical talks, panels, mentoring sessions and jury participation for hackathon submissions.

Programming covered infrastructure, scaling, privacy, real-world applications and Arbitrum’s growing role within the Latin American ecosystem.

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You can check here the slides:

(We are waiting for two slides more)

Complementing the on-site activities, two pre-hackathon workshops were delivered:

  • Introdução a Arbitrum:
  • Desenvolvendo em Arbitrum

These workshops provided a structured technical foundation for developers building with Arbitrum during the hackathon.

On-Chain Activations Enabled During ETH Latam

ETH Latam São Paulo also facilitated a series of on-chain activations showcasing the practical use of Arbitrum-based tools in real environments.

Merchant Onboarding: Mahá Restaurant

In early October, El Dorado onboarded Mahá, a local restaurant next to the venue.

Samuel, from El Dorado, with the Mahá team.
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El Dorado marketing activation
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Mahá processed more than R$ 2,000 on-chain during ETH Latam, marking its first-ever use of crypto. A simple user interface and clear onboarding guide enabled seamless adoption.

El Dorado also onboarded new individual users, including Serafin, a non-crypto user who executed his first peer-to-peer USDT purchase on Arbitrum to redeem a Red Bull at ETH Latam.
Reference: https://x.com/eldoradoio/status/1990933658111520877?s=20

Peanut Wallet Activation

Peanut Wallet contributed to on-chain adoption by offering 20% off on any Pix payment made through its application during the event, encouraging experimentation with Arbitrum-enabled payment experiences.

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These activations demonstrated tangible real-world impact and helped drive both merchant and user engagement with Arbitrum infrastructure.

Hackathon Participation and Bounty Awards

ETH Latam’s Real-World Ethereum Hackathon gathered 317 participants from 12 countries and produced 31 submissions. Arbitrum played a central role through mentoring, jury participation and a dedicated bounty track.

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Bounty Distribution (Total: USD 5,000)

1st Place – FHEVesting (USD 2,000)
Confidential vesting with ZK proofs + FHE.

2nd Place – Onflow Chain (USD 1,500)
Transparency infrastructure for payment and supply-chain data.

3rd Place – DriveFi (USD 1,500)
Privacy-preserving telemetry and parametric insurance logic.

Judging of projects submitted at the hackathon
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Trends Across Submissions

  • Expansion of ZK and FHE experiments
  • Payments and tokenization with real-world integrations
  • AI-driven agents and autonomous workflows
  • Identity and on-chain reputation models

Full documentation was submitted in the hackathon wrap-up file.

Quantitative Metrics

Metric Value
Total ETH Latam attendees 1,800
Hackathon participants 317
Hackathon submissions 31
Countries represented 12
Arbitrum Day attendance 200+
Livestream duration 5 hours
Arbitrum bounty pool USD 5,000

Key Learnings

Audience Flow and Unanticipated Variations

The presence of Vitalik Buterin — on his first visit to Brazil — generated unplanned shifts in audience flow, as participants moved across the venue to interact with him.

Cultural Differences in Attendance Patterns

Event scheduling preferences differ across regions. Weekend events perform strongly in Argentina, whereas weekday conferences attract higher attendance in Brazil. As the venue was pre-booked, Arbitrum Day occurred on a Sunday.

Parallel Programming and Fragmentation

The SheFi Summit ran concurrently at the venue, concentrating part of the audience in a separate track. Additionally, many attendees used the day for networking, contributing to audience fragmentation.

Coordination with Local Ambassadors

Coordination with the Arbitrum Brazil ambassador group was lower than expected due to reduced operational bandwidth on the ETH Latam / ETH Kipu side. The team acknowledges and appreciates the support of Netto and Modular Crypto, who played an essential role in facilitating execution and documentation.

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Conclusion

Arbitrum Day Brazil Chapter successfully delivered a high-visibility activation for Arbitrum within ETH Latam São Paulo 2025. The initiative reached diverse stakeholders, like builders, companies, institutions, students and first-time users, while fostering real-world on-chain activity through partner activations.

The event strengthened Arbitrum’s positioning in Brazil, enabled high-quality technical education, generated strong community engagement and produced a significant amount of Portuguese-language content that can now be reused and disseminated across the region.

The grant objectives were fully achieved, and the execution contributed meaningfully to Arbitrum’s presence and narrative in Latin America.

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