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On the business, strategy, and impact of technology.

Yep! This is exactly one of the reasons why we wanted to get rid of confirmation signatures.

colin-axner

Yeah you are right, the 7 day cutoff system should work.

When a user begins an exit, I think they should not only provide transaction t, but merkle proofs for each of the inputs. Merkle proofs can be provided since you can assume the inputs are not under block withholding constraints. They are necessary to prove the correctness of a transaction.

For example, without proving inclusion of the inputs, I could create a transaction with input addresses B referencing inputs at block n, even though the actual inputs of block n belong to address A. In a similar fashion, I could also create a transaction giving me 100 ether even though the inputs in reality were worth only 10 eth. Instead of challenging with the correct input information, it is easier to verify the inclusion of the inputs that are being referenced.

kfichter
colin-axner:

When a user begins an exit, I think they should not only provide transaction t, but merkle proofs for each of the inputs.

My current implementation has the user submit all signatures for t upfront. Any other user can then reveal a transaction that created an input to t such that the revealed signature is invalid. It’s a little less gas than revealing the input transactions up front.

I think it’s also possible to have the user submit a sum merkle tree along with t so we can easily prove that the value of all the inputs is valid, need to double check.

But yep, we need to prove that t is valid - suggestions for other ways to do this are more than welcome

kfichter:

even if they’re included in withheld blocks after “out of nowhere” transactions, will be correctly processed as long as they only stem from valid inputs.

as they only stem from valid inputs.

I think you need to refine your construction. It is not safe or live as it is written.

kfichter
MaxC:

Can you explain what you mean? We define “valid” transactions as coming from available/valid blocks (maybe this definition is what makes it confusing). Then we know that the transaction either definitely spends valid inputs (only spends inputs created before invalid tx/data withholding), or possibly spends invalid inputs (data is withheld).

Maybe we should refine the definition to “available/valid” and “possibly invalid”:

Our scheme guarantees that any transaction stemming only from available/valid inputs will be processed before any transaction stemming from any possibly invalid inputs.

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Many people try to argue against Wikipedia by pointing out that many academic institutions ban their students from citing Wikipedia as a source when writing papers. These people forget that using encyclopedias in general as a research source has always been discouraged by academics. Encyclopedias are often out of date from the day they are published and because they provide general summaries on complex and (at times) controversial topics, they often provide inaccurate or incomplete information. The main difference between Britannica and Wikipedia is that correcting a mistake in a Wikipedia article can be instant, as long as you can follow Wikipedia’s stringent guidelines for adding and editing content. Many experts and academics become avid Wikipedia contributors for the sheer joy of being able to share the vast knowledge they have acquired throughout their careers. In a world where knowledge is readily available and shared, our resources are better spent improving the quality of the freely available information, not clinging to expensive environmentally unfriendly forms of communication. www.WikiExperts.us

I have no problem with your owning of the book, and respect the right to the personal library. I also envy those who have the notes in their books--mine always ended up looking like a bunch of garbage, try as i would to mark them. To this day I always have "annotation envy." I also don't feel that your love of the book is in the same league as some of these people who are crying over the Britannica. Yours seems a lot more genuine. Not to be rude, and I am just asking out of curiosity, but which texts aren't easily available on the web. My interests are literary so Project Gutenberg has the standard canon (even if in poor translations), and the GA library system is state-wide and I can always seem to find most texts somewhere. If I can't find one, I buy for cheap off Amazon and then donate. I just prefer having less and feel that my life richer when I am lighter. I think that I was also just a little vexed at what I perceived to be snobbery over the Britannica at the expense of wikipedia. I remember my initial shock when I learned that they were no longer publishing the Great Books of the Western World, until I realized that 1) the ideas, authors, and literature transcend any book set, 2) that the format was almost unreadable and I know of very few educated people who could get through the entire set in their form, 3) I can still read the same authors (and listen to them) without any one set. The same might be said for the knowledge in Britannica.

As I read all of the wistful pining for the Britannica, and the critiques of wikipedia, I think back to what my high school teachers and college professors would tell us back in the mid 1980s and early 1990s. For writing papers, don't use encyclopedias. Another point--although eloquently written, and beautiful on a shelf did (or could) the Britannica really go that in-depth? Essentially 90% or most was simply facts, which are not much different than the wikip. Divergent points of view, extensive peer reviewed journals on arcane topics, the mathematical proof etc. never made the cut, and with the the hypertext format of wikip, these benchmarks of academic rigor are now more possible. At one time I shared this attachment to owning the printed book (I'd gush at Penguin classics, and owned a set of the EB's sibling the Great Books of the Western World), and had at least 2000 books in my personal library. But two years ago I donated 99.9% of them to a new library in Ghana. Now I own about 20 books, use the library, but somehow still manage to read over 100 books a year ( currently reading William Gaddis). I read online or borrow books from the GA state library system. My laptop is a better library than most university libraries just 20 years ago. Let the clutter go and save a tree. Final thought: was it really the books themselves that we all loved, or the fact that we could display them to others and feel smarter because they crowded our shelves?

.Marcus{Blankenship}

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