Renato Schiavinato Lopez

Agile Coach, Founder of GRIFORTIS, Creator of DuraShare.

[Vinteum @Vinteum_org]

Como encontrar bugs que ninguém imaginou? 🐛🔍

No dia 18 de novembro, Bruno Garcia e a Vinteum te convidam para o lançamento de Fuzzing: Conceitos e Prática, na Casa21!

O livro reúne fundamentos, ferramentas e experiências do Bruno com testes e segurança do Bitcoin Core para mostrar como encontrar falhas em softwares usando fuzzing.

Vamos celebrar esse lançamento com uma noite de autógrafos e troca de ideias entre desenvolvedores, pesquisadores, estudantes e curiosos pelo tema. 📚

📅 18/11, quarta-feira, às 19h30
📍 Casa21 — São Paulo
🎟️ Entrada gratuita, mediante inscrição e aprovação pelo Link: https://t.co/Tk1nagsp3t
📚 Exemplares à venda no local

[Bitfest — Bitcoin IRL @Bitfestuk]

Checkout is back up. 🟠

Maintenance and upgrades are complete—Bitfest 2026 tickets are back on sale, and all discount codes are working as normal.

19–22 Nov · Pendulum Hotel, Manchester

Get yours: https://t.co/XVl26GuWQA

[Renato Schiavinato Lopez @renatoslopes]

After its debut at @casavinteum from @Vinteum_org, and an exiting run at @tabconf, now it’s time for a DuraShare workshop at @Bitfestuk.

In two weeks time. Saturday, Nov 21. Manchester, UK.

https://t.co/veEUP6IvRd

[Renato Schiavinato Lopez @renatoslopes]

🚨 Attention UK and EU 🚨

Workshop DuraShare at @Bitfestuk on Nov 21.

Picture this: on an air-gapped device, you create a k-of-n backup of you BIP39. Years later, you recover it using just pen, paper and calculator.

That is what attendees will do on a hands-on workshop!

🤯

[Renato Schiavinato Lopez @renatoslopes]

@muziworks @tabconf Turns out I couldn't find Meshtastic nodes around me, yet. I'll explore locations and assess the need for a repeater. Still, my Muzi Works Base Uno works like a charm. Assemble and conf it way easier than play feather bowling... 😂😂😂

[Renato Schiavinato Lopez @renatoslopes]

@sesi_the_man I'd add that verification starts with awareness of your setup as a whole.

Serecolipringo presents the 7 Domains of Self-Custody and shows how they compete. You max one, you lose another.

Do you really know your setup? Do you know what you are giving up?
https://t.co/1Ka5qLVrBq

[Renato Schiavinato Lopez @renatoslopes]

Today, talking to one of GRIFORTIS' clients, we discussed Serecolipringo for the first time. They got really amazed by the clarity it brings to the self-custody trade-off discussion.

Check-it-out you too: https://t.co/1Ka5qLVZqY

[Renato Schiavinato Lopez @renatoslopes]

@narcelio Criei o Serecolipringo pra ajudar em parte dessa dúvida. Lições q trago nele:

1 - Autocustódia é complicada. Busque ajuda!

2 - Não trate "meu Bitcoin" como uma coisa única, pense em camadas.

3 - Multisig é autorização, não backup. Vc pode usar ambos.

https://t.co/1Ka5qLVZqY

[Renato Schiavinato Lopez @renatoslopes]

To celebrate Bitcoin whitepaper's 18th birthday 🎉, how about you colab on a new open source project?

Serecolipringo!

A community-built self-assessment questionnaire on the 7 Domains of Self-Custody.

People at @tabconf started it!

https://t.co/KwRxCQDsdZ

[Renato Schiavinato Lopez @renatoslopes]

Another @Vinteum_org Deep Dive!!!

"The goal was to understand how different protocols allow users to transact without recording every payment on Bitcoin's blockchain, while preserving some ability to recover their funds independently." - @edil_medeiros

[Vinteum @Vinteum_org]

When a Bitcoin payment happens off-chain, what makes it more than a promise?

At our latest Deep Dive, developers explored payment channels, eltoo, channel factories, CoinPool, and Ark, comparing how users can enforce their claims on-chain.

https://t.co/2666H3aYvY

[Renato Schiavinato Lopez @renatoslopes]

@miketwenty1 Yep, and it was there during the exploit, showing an awkward scale... I guess nobody ever considered that they would have only 5% of solvency.

[Renato Schiavinato Lopez @renatoslopes]

That is a cool solution. @SeedSigner keeps getting better and better. My favorite hardware wallet by far!

[Keith Mukai @KeithMukai]

Users have often asked for a way to skip deactivated letters in the @SeedSigner bip39 mnemonic word entry UI to minimize nav movements.

It's a harder problem than it initially seems.

I brainstormed a bit with Claude and landed on this cool "Pack each row" approach.

[Renato Schiavinato Lopez @renatoslopes]

@Vinteum_org deep dive on L2s... Wait for the report, coming out soon!

[Luca @luca0x46]

We are @casavinteum by @Vinteum_org doing a Deep Dive session on L2s… After reading about Ark in general, different papers and posts since Burak’s proposal, we are now getting into how covenants can help enhance the Ark protocol.

[Curitiba BitDevs @curitibabitdevs]

🚀 O #019 BitDevs de Curitiba está chegando !

📅 Data: Sexta, 23/10 – 19h
📍@UFPR - Auditório SEPT Bloco A https://t.co/EyLnLsEBjb
🎙️Hosts: @luisfg21M & @diogock & @gustingelin

🙌 Apoio: @Vinteum_org

[Floresta @getfloresta]

Floresta’s Q4 2026 roadmap is out.

Goal: a welcoming project. Stronger tests, dependable CI, automation that gives devs time back and logs that explain what the node is doing. As code gets cheaper to write, verifying it matters more.

[Bitcoin Korea Conference @btckoreaconf]

🎉SPEAKER ANNOUNCEMENT

🎙 루이스 슈바브(Luis Schwab, @luisschwab_) | BDK·플로레스타(Floresta) 개발자

루이스 슈바브는 비트코인 노드를 지갑 앱 '안으로' 넣고 있는 개발자입니다.
지금 대부분의 지갑은 잔액을 확인하고 거래를 보낼 때 외부 서버(일렉트럼·에스플로라)에 물어봅니다. 그 서버는 내 주소와 거래 내역을 함께 보게 됩니다.
루이스는 유트렉소(Utreexo) 기반의 가벼운 노드 플로레스타(Floresta)를 지갑 개발 도구 BDK(Bitcoin Dev Kit)에 붙이는 작업을 하고 있습니다. 그러면 지갑이 남의 서버에 기대지 않고도 스스로 동기화하고 거래를 보낼 수 있습니다.

내 지갑이 잔액을 보여 줄 때마다, 누군가의 서버가 내 주소를 들여다보고 있다면 어떨까요? 휴대폰 속 지갑이 직접 노드가 될 수는 없을까요?

이번 컨퍼런스에서 루이스 슈바브가
‘30억 대의 기기가 Floresta를 실행한다'를 주제로 강연합니다!

[Renato Schiavinato Lopez @renatoslopes]

DuraShare's pre-print academic paper. The cryptographic primitives in it aren't novelty, but you might like the way we are using them. Thanks to @jvdgbr for the final version.
https://t.co/srTnibhBYN

[Renato Schiavinato Lopez @renatoslopes]

The workshop was great, thank you @KeithMukai and @tabconf! Excited about this touchscreen interface for @SeedSigner. Willing to chip in for R&D to make a stateless, air-gapped version a standard offering in the manufacturer's catalog.

[Keith Mukai @KeithMukai]

The @SeedSigner workshop at @tabconf was a success!

About 25 people showed up, received their free esp32-P4 dev board, and nearly everyone had flashed my work-in-progress MicroPython port to their board by the end of the hour!

Excited to see what they build!!

[Renato Schiavinato Lopez @renatoslopes]

Picture this: a community built assessment questionnaire for people to grade their setup on the 7 domains of self-custody, the Serecolipringo. People at @tabconf has started it, and you can help build it too: https://t.co/KwRxCQDsdZ

[Renato Schiavinato Lopez @renatoslopes]

First DuraShare challenge, at @tabconf. Guess who won?! @AndrewPoelstra, in a record time! Congratulations!!! 🎉🎊