this post was submitted on 29 Aug 2023
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Any form of internet communication is potentially susceptible to traffic analysis, so that flaw isn't specific to this particular design.
The goals here are to address some of the other weaknesses of communication protocols, ie lack of auditability and reliance on a central server. They do not claim it's completely impervious to attack.
Not sure how this would work, but potentially one advantage of blockchain over peer-to-peer is less metadata needed?
All the encrypted messaged just get dumped into the public blockchain, you might be able to glean who (or at least where) a message was sent from, but the reader could be anyone with a decryption key. A bigger channel, like a newsletter type thing would just involve more read keys being available. Kind of like old school cold war numbers stations or encoded messages in the classifieds. You might be able to figure out that KGB agent Pyotr placed a classified ad for "Golden Lab, found near 5th Ave. and Main St." in the "lost and Fond" section, but there would be no way to know which of the papers many readers would be able to decode the message.
Of course the practical problem would be the size and scale of the blockchain. I think Bitcoin 1.0 was only able to do 7 transactions/second. With each message a transaction, and each read requiring the reader to pick out their message from the pile, my above hypothesis would have to be compromised in some fashion to be usable.
Ok, so the main purpose of a blockchain is to get a bunch of computers that don't trust each other to agree on who did what when.
A blockchain gives everyone a "voice", so they can share what they heard. But it can't be the sort of voice we have in the real world, because one computer can easily impersonate a million computers. In the case of Bitcoin, your "voice" is your computing power. Your computer might be able to impersonate a million computers, but your CPU cannot do the work of a million CPUs. So it is nearly impossible for single malicious computer to "drown out" all the other computers and insert a false message into the blockchain.
Bitcoin has a limit to the number of transactions per second because it wants computers to pause and talk to each other before validating a transaction. The delay is a feature, not a bug. This arbitrary limit is designed to self-adjust, so adding more computers won't make the process go faster and removing computers won't slow it down.
That said, computing power uses a lot of energy. Too much energy. So now there are other ways to assign voices that don't rely on raw computing power but still prevent impersonation. This particular messaging protocol uses one of them, it is not based on computing power. But there is still a blockchain that contains everyone's messages, and a malicious computer in theory cannot overwhelm the common consensus. So you can be pretty sure that if a message appears in the blockchain, then it was sent by the person who claims to have sent it.
Note that unlike Bitcoin, this blockchain is not public. It is not like a secret agent placing a classified ad that all can read (but not understand). Even the encrypted form of the blockchain can only be accessed by servers whose users participate in the conversation. If your server has nothing to do with a group, then you cannot glean anything at all about the conversations within the group.