Blockchain - Sicherheit auch ohne Trust Center

1. 00:00Now that we've had a good look at the Bitcoin blockchain, let's see where you're going. you can change the concept a little bit.
2. 00:09There's different types of blockchain, which are then used in the various applications, play a role in the different contexts
3. 00:17and we'll see where you can find you can make changes there.
4. 00:22So Bitcoin, birth of the Blockchain, so it's the best known example, and this is a public blockchain.
5. 00:30Every participant has the full right to see all transactions, Every participant has the right and can in the competition for the block creation and take care of it.
6. 00:44To do this, of course, it must have full transparency about everything that's going on, about every transaction, it's obvious who it goes to, who it comes from.
7. 00:54So that's what we call public, that's the example of this big blockchain, where the security, the trust is established over it, that everyone has insight there too
8. 01:10and with the Nakamoto consensus there. there is also corresponding confidence in the blocks.
9. 01:19There are other use cases, that other blockchain types need.
10. 01:25For example, differences may lie in the rights of use.
11. 01:28In the usufruct, who can see there, what's going on in those transactions in detail, that is of course in the end also a question of data protection.
12. 01:39Who is allowed to participate in this consensus-building process?
13. 01:42So when you think about the rights of use, there one can roughly differentiate into public rights of use, public,
14. 01:49or private rights of use, that only certain participants have the right in such a blockchain,
15. 01:57download and read the blockchain itself, verify it, that you can limit who can send transactions to the network.
16. 02:07So these are all issues, which are located in the context of rights of use.
17. 02:13When we talk about consensus participation, you can distinguish two situations.
18. 02:19Permitted participation in consensus building and free participation in this consensus-building process, so who gets to put the transactions in the block?
19. 02:35In certain applications it is possible that only certain participants have the right or all participants in the network have the right to form such blocks.
20. 02:45If we were to record this in a graphic like this, then it's like, public, everyone has access, it doesn't need permission, to see the blocks, the transactions, to form the blocks.
21. 02:59So there's no trust in the infrastructure, so it's exactly our peer-to-peer situation for which the Bitcoin was developed.
22. 03:09You can also imagine, and that's because of the difficulty of forming this consensus,
23. 03:17but one can also imagine that everyone has the right, since to see the transactions,
24. 03:22but only certain people are allowed to do it, to keep the book about it, i.e. to form blocks, to append blocks.
25. 03:31We're already a bit close, it's not a peer-to-peer network where there's no trust,
26. 03:37but then there's already a few that are trusted, that they're doing this block building process properly.
27. 03:44And if we go into the private realm now, that the transactions and the blocks are no longer to be seen openly. can no longer be properly verified,
28. 03:57then it becomes an instrument in its own network somehow of an application, where a high degree of trust must already prevail and the data is protected, no longer visible to the public.
29. 04:17So it's all a question of philosophy. and the scope of application.
30. 04:21Here are a few applications shown for the different things, so here in this very traditional area, where we also have our Bitcoin blockchain,
31. 04:33anyone can participate in the consensus process, anyone can form blocks, everyone has read and write access to the blocks, to the transactions.
32. 04:43Everybody's here, Bitcoin, Ethereum, Monero, these are all examples of applications in this area.
33. 04:51To be honest, that is also the area, that constitutes the actual block chain,
34. 05:00a trusted network, a peer-to-peer network, on consensus-building mechanisms, trust is established through cryptographic mechanisms.
35. 05:12If we ever go into this area, that only certain places, certain participants have the right, to carry out the consensus process, i.e. to form and append blocks,
36. 05:26so there's representatives here, r3., sovrin, where that's the case.
37. 05:33Anyone can read and verify in the blocks, but the blocks form, that's reserved for a few.
38. 05:42It has something to do with efficiency, it has something to do with the question, that you want to create security to do that, too,
39. 05:51but this isn't just a peer-to-peer network anymore, the net participants must trust that these instances, that are allowed to form and attach these blocks,
40. 06:02they have to trust that they're not cheating.
41. 06:05And here, if we also want to hide the rights of use, that both the participation in the consensus process and the reading access to the blockchain is restricted to a few selected ones,
42. 06:22Ouorum and HYPERLEDGER are examples for this blockchain, the blockchain is more likely to be used to keep an internal accounting book.
43. 06:34For the participants there are trust instances again. as we originally had with the bank.
44. 06:41Now, if you look at the pros and cons, why work with different blockchain types, why are they useful and adapted for the different applications,
45. 06:52then of course the Permissionless is the original, the Trustless, and then everyone has to be there to build trust, can rely on the immutability of the block chain,
46. 07:06so there can't be a circle of chosen ones, that may be involved in the formation of the chain have any rights and can mumble.
47. 07:15In contrast to this, when only certain network participants are responsible for this construction of the Blockchain, for archiving transactions,
48. 07:28then of course that's much faster possible because of this consensus of trust, waiting for a certain number of blocks that we had discussed, the time the information takes to spread across the network,
49. 07:40this can of course be regulated much faster here and is therefore less expensive.
50. 07:46When we answer the questions, who has the rights of use? in this private case data protection is of course guaranteed.
51. 07:56The participants do not have the right to see, who has now transferred how much to whom
52. 08:01This is of course fully transparent in this public model, where each participant sees each of the transactions.
53. 08:10And in this system there is also a high level of redundancy, because, of course, every transaction is stored with every participant.
54. 08:20So it makes sense to modify certain parts here, there are good reasons, the different applications show that.
55. 08:30Whether all of these variants will actually be successful and sustainable as the best solution for archiving the transaction process,
56. 08:45the exchange of messages, traffic within a network, of a peer-to-peer network,
57. 08:53Time will tell.

To enable the transcript, please select a language in the video player settings menu.