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True< this is a scary time for new investors but the best thing you can do is not to make decisions based on emotions. This could actually be a good time to buy more of your high conviction stocks or crypto on a discount. Wealth is created during bear markets, not bull markets. If your portfolio is really affecting your mental health then delete the app and go for a walk. Let the market do its thing and have a long time horizon. I buy and just trade long term more than ever, I have made over 16` btc from day trading with Mark Maxwell in few weeks this is one of the best medium to backup your assets incase it goes bearish…
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0:00 intro 1:47 cryptographic hash functions 20:28 hash pointers and data structures 29:23 digital signatures 39:03 public keys as identities 44:32 a simple cryptocurrency
Slide Commitment API: What's the purpose of the key? The only thing you publish at beginning is commitment. Message is kept secret until opening envelope. So you can easily do only com=h(msg) and publish com. Nobody can reveal msg from com. Message originator can't forge original message because he can't find msg' with the same hash h(msg)=h(msg'). Everything works without the key as well. All you need is clear hash.
Qestions: 14:00: "...returning as commitment: is it "hash(key) + Message" *or* "hash(key+message)"? 14:15: When the key+message was given to the verifier so he could hash it for comparsion? Great lecture!
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Typing out my questions as I make my way through the video... I'll probably be posting multiple times... - When discussing the commitment API around the @14:28 mark, why do hash the 256 bit key? H(key) - Is it because we do "H(key | msg)" and theres some sort of communitive property? - Is "binding" essentially the same as saying the hash function is collision-free (impossible to find collisions)
13:45 So commit(msg) returns (com, key), where in reality this is equal to (H(key|msg), H(key)). Does this mean that the key which is to be published is actually equal to H(key)? In that case, how could it possibly be that the verification method which uses the published key(aka H(key)) could ever succeed, since it will always be doing: verify(com, H(key), msg):=H(H(key)|msg)==com bearing in mind that com=H(key|msg).
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More Qeustions: @23:48 - How is the data from in a tamper-evident log stored? In a key value store? Since you are not using pointers to memory you need an auxilary store right? - Does the prev H(arrow) include the prev pointer AND the data or just the data? It would make more sense to include both right?
I have a thought about the identity in Privacy. When analyzing the behavior of an address to find out who that is, isn't it a good idea to use Machine Learning to run through the layers and to update the output over time? The activity of the address can be the input layer, the probability that that is Joe would be the output layer.
at 7:16 he says "that if we know X and Y have the same hash, then it's safe to assume that X and Y are different" Did he mean to say that they are the same? The formula above shows "If we know H(x)=H(y), it's safe to assume that x=y"
yes H(x)=H(y) it is safe to assume x=y but it is rare situations where H(x)=H(Y) where x!=y it means it is difficult to find where Hash values are same with different X and Y. I think this is the concept he explained. If I make any mistake please correct me .
Arrow pointers under heading of 'Blockchain' and 'Detecting Tempering' should point to previous/parent block H( ). It correctly mentions previous H( ) though arrow pointer shows next H( ). Both Bitcoin and Ethereum Block Header stores parent H( ) which is previous H( ). Please correct this.
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I would like feedback on this concept Imagine a hash being generated by number string occurring only once in space+time would that not eliminate any "collisions?"
Great work .Would like to request Blockchain sync that covers and the technical background for Peer to peer network. Covering Topics like 1. Bitcoin Peer Discovery 2. Inital Block Download 3. HeaderFirst Block Downloads. 4. Orphan Blocks and 5. Alerts Mis behvaing nodes. These are all topics that have been added to bitcoin documentation on bitcoin.org/en/developer-guide#orphan-blocks and are closely related to Stanford lecture for 4 Gen Peer-to-Peer Technology.
7:42 Dude says for a collision free hash function H, when H(x) = H(y), x does not equal y. This is false. For a collision free hash function H, when H(x) = H(y), x = y. Also this "collision free" function is called an injective function if you want to learn more about it.
I noticed that too. So I'm assuming he meant to say if H(x) = H(y) and the hash function is collision free, then it's safe to say x = y. Or did I miss understand?
Is signature the way to prove , that someone is holding certain private key? Other words do we have another API for signature saying: isTheSameSK(pk,sig1,sig2)? This is like asking: is sig1 and sig2 made by the same person ? Or i can send a msg2 to this person and ask to sign it and later verify he also signed msg1?
Are these lectures the same ones being used for Coursera's Cryptocurrency course? I'd just sign up for the course but I hear the assignments on this specific course are pretty frustrating.
@24min: re tampering: i undertand that tampering is not possible in th middle of the block chain but what if the tampering occurs at the very end of the chain (at the most recent "link"). would that not be possible?
The IRS recently released new guidance about virtual currency-the first in 5 years-which mainly dealt with whether taxpayers have gross income from two cryptocurrency events: hard forks of cryptocurrency the taxpayer owns and an airdrop of a new cryptocurrency following a hard fork, if the taxpayer receives units of new cryptocurrency. If you own virtual currency, no matter whether these terms sound like a foreign language to you or you are familiar with them, you may need to account for these events on your tax return for the year when they occur. As a crypto investor, you face significant risks regarding taxation and the IRS. These risks can be mitigated, however, with help. Most accountants have no clue. Lance Wallach receives hundreds of calls for help. Google him and your advisor. Who do YOU trust?
