#bitcoin-and-cryptocurrency
8 posts
2026 - August
2 posts2026 - July
1 post2026 - April
1 post2017 - December
1 post2017 - November
2 posts2017 - August
1 post2026 - August
2 postsWhat the Google Quantum Vulnerability Paper Means
Google, the Ethereum Foundation, and Stanford estimate breaking secp256k1 with under 500,000 qubits. I compare GLM, Kimi, and ChatGPT, calibrate the real odds of theft in the coming years, and what you can do today.
Exploiting Coinkite's RNG Egregious Problem
How an attacker enumerates the ColdCard's reduced key space, finds vulnerable wallets on the public blockchain, and moves the funds. Real data from the ongoing theft and step-by-step didactic code.
2026 - July
1 postURGENT - If You Keep Bitcoin on a ColdCard: MOVE EVERYTHING
An entropy flaw left seeds generated by ColdCard firmware far below the promised security level, with estimated losses above 1,000 BTC. Understand the bug and migrate without repeating the mistake.
2026 - April
1 postBitcoin on the Home Server: Sovereignty and Privacy with Coldcard, Sparrow and Fulcrum
I built a home Bitcoin stack with Coldcard, Sparrow, Fulcrum, and bitcoind: offline keys, private queries, and my own broadcast. It takes work, but gives me more control over custody and operations.
2017 - December
1 postCryptocurrencies: Is it a Bubble? Does it Matter?
The bubble may burst and Bitcoin may plunge, but that does not end the story: the author compares it to the dot-com bubble and argues for an antifragile bet limited to what one can afford to lose.
2017 - November
2 postsFrom 10k and Beyond: Discussing Crypto Currencies
The author responds to criticism about the bubble, energy, centralization, scale, and social role of cryptocurrencies. His conclusion is to avoid hype, study the fundamentals, and personally accept the risk of investing.
How does Bitcoin force consensus among Byzantine generals?
Bitcoin combines hashes, Proof of Work, mining, and adjustable difficulty to reach consensus among unknown nodes. Even with $1.5 billion in hardware, the network would remain difficult to break.
2017 - August
1 post[Off-Topic] Blockchain and Cryptocurrencies in Brazil
I shared recommendations for Brazilian companies connected to blockchain and cryptocurrencies, still as an investor without a project of my own. I also looked for professionals with hands-on experience to speak at THE CONF.