Imagine paying 10Million sats for one dollar. Crazy🤯

Does someone know more affordable alternatives to #Pursim or #Framework for either Notebooks or Smartphones? Obviously it should feature simular #Privacy aspects. FOSS, Kill switches, batterie replacement, shouldn't be produced in China etc.

Public #Nostr relays in Germany.

A thread why #Bitcoin's PoW solves the oracle problem ⬇️ (from my Twitter 07Jan2023, bc X is closed knowledge) So what is the oracle problem (op)? The op is trying to bring real world information into a digital information network (eg Bitcoin) without relying on one or multiable trusted parties (called a oracle). So what do I mean by real world informations? When I ask another peer in a network what 2+3 is I can always #verify the result on my own. But when I gonna ask what the current weather in London is I have to trust that peer or ask other trusted peers such as british news channels. So to conclude #math is conciderd trustless. So what is PoW? PoW means proof of work. Its a method to proof that one of your peers did work without trusting someone. But how does it work trustless you might ask? We can't just settup a camera in their room and watch them work since it would be easy to cheat on it. And the camera would be a trusted partie again. The answere again is #math. But we first need to learn a little bit about algorithm based hashfunctions. Bitcoins PoW uses mainly sha256. The most important part about hashfunctions (here) are that they are not reversable calculations. What does that mean? When I calculate 2+3=5 I can allways reverse that with enought informations. If I don't know the 2nd number: 2+?=5 i can reverse that by calculation -2 on both sides: ?=5-2 . That lets me know that ?=3 . But you can't do that with hashfunctions. The hashfunction Sha1 with an input of the number 137 looks like this: Sha-1(137) = e1a864f0b77f6c89794827a9035355dc8d052622 But just a small change to 138 gives you a complety diffrent result: Sha-1(138)= 56ad4d4deaec98465c419b4a8ea7bfc1ed38c4d9 Since there is no way to tell if your input was below/above 100 or if it even was a number, because you can input text as well, the only method of getting the input, when you only know the result, is by trying out one input after the other. Test it out:

SHA-1 hash calculator | Xorbin

SHA-1 algorithm calculator

How does Bitcoins PoW use the hashfunctions? When you give someone the task to get you a specific result of sha-1 they have to guess a lot of inputs to get the result. This is conciderd work. Getting the right input is the proof that your peer did work for that. (or that they were lucky) Their solution of the input however is quick verifyable, since calculating only one hash takes far less than a second. Bitcoin actually however uses a range of results that are concider the right result (Number must start with x amount of 0's). Thats how Bitcoin makes sure you need to provode real work to secure or attack bitcoin. " But wait?! You didn't explain how I can get the weather in London" Your right. Because getting these type of informations trustless is impossible. Work is the only realworld information you can get trustless. *Note that you can reduce the trust by having several validators, but trust is allways a terrible risk. No matter how little. Trust = information centralisation. Examples of real world informations: Price of stocks, stablecoins (price of a currency), a picture, music, videos. #Cryptocurrencies that use oracles are relying on trust and are doomed to get centralised. When they claim to be decentralised you now know they are a #scam. Distributed doesn't equal decentralised.