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The blockchain is essentially a ledger that tracks transactions (including the creation of currency). One thing that is not always clear is how important it is for a blockchain to be decentralized. When I say “decentralized,” I mean that many different people are operating a server that performs transactions on a larger network. These people are rewarded in currency for their efforts, and are sometimes referred to as “miners,” though this term is changing somewhat.

There are thousands of these servers in a network that are operating on and tracking the ledger for blockchains like Bitcoin or Ethereum. Any updates to the ledger are verified by all of these nodes. As long as 51% of nodes can verify a transaction, it will be added to the ledger. This means that as long as someone doesn’t own 51% of the network, they can’t just inject whatever transactions they want (i.e., fraudulent activity). In practice, this makes these networks very resilient to fraud.

I think this paves the way for a lot of the practical examples you’re looking for. For example, there’s no way for the network to decide to just give tons of money to a single entity for some “economic policy” like Too Big to Fail (i.e., corporate bailouts). This means you don’t have to wake up one morning worrying about whether or not your currency will rapidly inflate because of things like corruption. Another example is the true ownership of digital assets. NFTs have (rightly) gotten a lot of flack for being overpriced JPEGs, but there are real use cases here. A random middleman can’t just decide to price gouge because they own all the tickets first (Ticketmaster). Instead, artists can mint tickets on the blockchain (very important: this ensures authenticity) and then fans can buy them on the blockchain - no middle man required. You still show a QR code at the door for verification like you would now.

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daltotron@lemmy.world ⁨8⁩ ⁨months⁩ ago

As long as 51% of nodes can verify a transaction, it will be added to the ledger. This means that as long as someone doesn’t own 51% of the network, they can’t just inject whatever transactions they want (i.e., fraudulent activity). In practice, this makes these networks very resilient to fraud.

Could like, 51% of the owners just coordinate to kind of, do a fraud? I mean it sounds like an inherently democratic system, but from what I’ve understood of, say, miners, right (dunno how this works for proof of stake, but I imagine it has similar problems), those rigs are gonna be bought by people who disproportionately have higher earnings and can afford more GPUs in finland or wherever, and then that’s going to just kinda recreate the same power dynamic that we see in the real world already. Which ends up in the same kind of speculative market garbage we have with stock ownership in companies already.

I also don’t really understand how a ticketing system would really work on the blockchain. I probably don’t know enough about cryptography to know how it might work, but I got the sense that nfts weren’t even overpriced jpegs, they were overpriced links with pseudo-legal contracts, that were still prone to link rot, and didn’t really indicate any IP ownership. If you had a code on the ticket instead that could only be verified as real, rather than fake, by a ticketing person, instead of like, a link, that would probably be the use case, right? am I getting that correct, is that something cryptography can do? probably, right?

Also, can someone just like, steal your ticket still? Or like impersonate you as the ticket guy, or what? Like from the others have told me and also just from what I know already, you can’t really change the chain unless, like you said, you have 51% of the owners, so how would you be able to like, put something in the chain that identifies the owner as being the owner? Wouldn’t it be more secure to have just like, a verifiable code or something, that you can delete, that isn’t public, between the artist and the buyer? Then you could ensure anonymity between the buyer and the venue and stuff, you could work in establishing characteristics like oh here’s my driver’s license, here’s my government ID, without putting that stuff on the blockchain, which seems like a bad idea.

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- Dalvoron@lemm.ee ⁨8⁩ ⁨months⁩ ago
  
  In practice, this makes these networks very resilient to fraud.
  
  Could like, 51% of the owners just coordinate to kind of, do a fraud?
  
  Sybil attacks sound like the kind of thing you’re talking about. I don’t have the expertise to go into it, but one person (or a group) creates lots of nodes and uses that influence to do bad things to the network, potentially including fraud. Or as you suggest, legitimate users can just coordinate to do whatever they wanted (see ethereum vs ethereum classic if you want a chuckle).
  
  I want to make a note that the networks are only resilient to a specific type of fraud - people trying to enter data in a way that doesn’t meet the criteria of the system. That’s all well and good for wallet to wallet transactions, but when you have transactions going off chain (like buying something, trading for other kinds of coins, doing anything with crypto exchanges), there are still plenty of other kinds of fraud that are possible and happen all the time, because while the chain is fairly trustworthy, nothing else about the system is. Most kinds of fraud involve doing things that technically you have permission to do, because you lied to people to access their password or promised them bigger returns in the future or missold a product or service etc and all of that is still possible under crypto. In some cases crypto is more vulnerable to these things because of having no central authority or regulator or laws or whatever.
  
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- Knock_Knock_Lemmy_In@lemmy.world ⁨8⁩ ⁨months⁩ ago
  blockworks.co/…/nft-airline-tickets-revolutionize…
  
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