I decided to play with cashu so I made https://paywally.pages.dev It’s a standalone web app, no KYC, that implements a lightning paywall: you need to pay 21 sats to unlock the hidden content. How it works: The app fetches a 19 sats invoice from bordalix@coinos.io ...

Let me start with an analogy: On mainnet, when Alice wants to send to Bob, she has 2 options: Sign transaction and broadcast it (Bob will find it on mempool) Sign transaction and send it to Bob (Bob can broadcast it immediately or later) Let’s call it Send and Send ...

Announcing my latest pet project, Helm Wallet. I believe there’s a huge gap between the ease of use of Wallet of Satoshi and the self-custody of Phoenix. To minimize this gap, I created a new web app, a wallet that has the self-custody of Phoenix and is easy to use as WoS. ...

Buy gift cards from The Bitcoin Company and pay with Liquid BTC:

• Buy gift card (includes VISA)
• Capture Lightning (LN) invoice
• Call Boltz and make LBTC => LN swap
• User pays LBTC with Marina wallet

Try it yourself: Liquid TBC

Motivation:

• Because I can 😉
• To show the possibilities of integrating Liquid with the Lightning Network
• Now there’s code in plain javascript that anyone can read and adapt for their own needs

Nostr stands for “Notes and Other Stuff Transmitted by Relays”. It is a decentralized social network protocol that aims to create a censorship-resistant and user-empowered alternative to existing social media platforms. Key features of Nostr: Decentralized: Nostr doe...

Sighash, short for Signature Hash, is a concept within the Bitcoin protocol that determines which parts of a transaction are signed. It plays a crucial role in ensuring the security and integrity of the Bitcoin network. By using different Sighash types, users have control...

Do you know which Bitcoin constant is this? 26,959,535,291,011,309,493,156,476,344,723,991,336,010,898,738,574,164,086,137,773,096,960 Maybe in its hexadecimal format? 0x00000000FFFF0000000000000000000000000000000000000000000000000000 Yes, it’s the maximum target hash....

How can I buy Bitcoin? Generate a password, and then pay someone to send bitcoins to that password. A password?! That's it? Yep, that's it. What do you mean with "send to a password"? It means those bitcoins now belong to the owner of that password. Wh...

Bitcoin Cash double spends Double spend is when a set of coins is spent in more than one transaction. This can happen for various reasons, but one of the reasons is fraud attempts. Bitcoin Cash accepts 0-conf payments, which I consider insecure by default. But...

What a clever idea. The possibilites are endless. Well played Nintendo.

Today I'm proud to announce http://hatitude.pt, the place where you help an athlete every time you buy men's underwear. The idea was presented to me by Hugo. I loved it, and so I decided to help him by developing the website. The problem As you might know, only a couple o...

Every now and then people ask me for iOS versions of my mobile apps. I don't build them, due to the following text in the Apple Developer Agreement: 11. Apple Independent Development. Nothing in this Agreement will impair Apple’s right to develop, acquire, license, mark...

The problem: Imagine you are in Portugal, you want to go surfing, but you don't know where the best waves are. What do you do? Well, you open your surf guide, see what surf spots are near enough, search for a beachcam on that spot, and after some thorough evaluatio...

I'm following the Blockchain revolution for quite some time now. I even took a Princeton online course in the Spring of 2015, which I highly recommend, if you want to understand how it works at a technical level.

Every time someone asks me to explain why am I so excited about it, I would like to have some quick easy way of explaining it, or maybe some link to point to.

Today I've found the best, Explain Like I'm Five, Blockchain video, and I'm putting it here for convenience. Watch it, it only takes 10 minutes:

Almost 10 years ago, me and some friends created excentric, a digital marketing agency. It was a big adventure, with ups and downs, with some huge successes and some defeats. We were able to put together an amazing team of really talented people, who sticked together on the ...

While I still think VR has a long way to go, this new product from Google, Tilt Brush, got me thinking. As they state in their website, Tilt Brush lets you paint in 3D space with virtual reality. Your room is your canvas. Your palette is your imagination. The possibilities are endless..

Hard to imagine it? Don't worry, there's a video:

Is it a plane? No, is Alexandru Duru, a Montrealer, flying 250 meters in a hoverboard, thus breaking the Guiness World Record for farthest flight in a hoverboard by fivefold. Could this be the future of personal traveling? Watch the video:

For the first time in many years, I posting twice in the same day. Another project announced at the Google I/O, this time concerning fabrics, touch sensitive fabrics. The guys from ATAP are surely kicking ass:

Google just announced his Project Soli. In a nutshell, is a radar so small it can be integrated in a smart watch, works through materials, and is able to detect micro movements. It's like the Leap Motion, but in nano scale. The potencial here is huge. See the video:

Holy shit! During the morning I found an article about patents from Magic Leap, and spent the rest of the day drooling. But 20 minutes ago, I got totally flabbergasted:

I so want to give you my money.