[g00n]

Maybe it's because I don't have a use for it yet, or at least don't know if I have a use for it. But, the whole Ethereum universe seems vague and seems like they could explain it more than they do. "Install Ethereum wallet, write a contract, ..., Profit!" ?? Is there a better source that might explain what it is, how it works (a glancing explanation not a full network inner workings)??

[jerguismi]

The use-cases for smart contracts seem to be quite low, so I wonder if it really is worth the investment to learn to develop smart contracts. Additionally, even the smart contracts written by the experienced ethereum developers have contained bugs, resulting to losses of tens of millions worth of ethereum. To me it sounds like it is much smarter to use some pre-existing smart contract which is used by many, instead of making your own. However if you really have a new idea for smart contract then you could learn the language.

[ym705]

"To me it sounds like it is much smarter to use some pre-existing smart contract which is used by many, instead of making your own." This is exactly how the last "big hacking" had happened https://qz.com/1034321/ethereum-hack-a-coding-error-led-to-3...

But as you said writing your own is also error prone.

[repomies691]

How about taking some existing smart contract, and also reviewing it also carefully? If it is used already by lots of users, people have already trusted it with their money.

I'm pretty sure that developing your own has much, much higher risk than using some pre-existing solution.

[jwfxpr]

I Am Not An Expert.

If I understand correctly, these are a way to automate the execution of the financial part of normal contracts without the need for undue trust between parties. Some simple examples that might help (and I invite correction):

• I and a few investors agree to buy into an enterprise in several installments. A contract can be written to the blockchain that automates these payments. Should a majority of the investors decide to withdraw support, the payments will cease, but while more than 50% wish to continue support, everyone will continue.

• I have an enterprise that I am highly confident will generate profit. I can establish a smart contact that guarantees my investors a minimum ROI at specific intervals; should the balance fail to grow by the agreed margin, all investors will instead be refunded (in full or part) based on a scheme agreed a priori to be fair — say, a function of shares owned for how long.

• I and several other Ethereum miners agree to develop a scheme built on top of Ethereum for, say, a specific method of interoperability between the Ethereum blockchain and traditional futures markets. We have a specific idea for this, but agree we need to ensure that there is momentum in the project, and want those participating to have 'skin in the game'. We build a tontine such that all of us invest a non-trivial amount, and any investor becomes ineligible for payout if their hash power abandons the protocol. If this falls below a certain threshold, remaining investors can vote to continue or divide the pot and abandon the project.

[sjy]

The problem with your first two examples is that the 'investment' locked up in the smart contract can't be spent, which means the investors are not bearing any risk, and therefore cannot enjoy a return. If the money could be spent on capital and operating expenses, then the smart contract wouldn't be able to refund it if the conditions of the investment failed.

It is possible to create a smart contract, like the DAO, which implements the rules of a joint stock company. But stockholders are not concerned about the risk that these rules will be broken. The risk is that the company fails and there is nothing to distribute according to the rules. Replacing the general meeting of stockholders with a smart contract doesn't change the economics of collective investment – it just adds the risk of losing everything to a bug in the contract.

[al2o3cr]

    without the need for undue trust between parties

Needing to assume that the contract author didn't make a trivial mistake (like leaving off `internal`) that makes all your tokens fall on the floor seems like a pretty sizable chunk of trust - and that's also assuming everybody involved isn't malicious.

[ym705]

Uses case are infinite.. You could also for example write transparent casinos system, transparent marketplace where every transactions would be certified by both parts, a banking system, some new money, ect..

[Double_a_92]

Yeah people. Explain Ethereum without using the words "smart contract" please.

[mbrock]

It's a distributed money database with stored procedures.

[apapli]

Awesome reply, I've been searching for a simple explanation. This is superb.

[bshanks]

Ethereum is a cloud computing service. It has two advantages over other cloud computing services: (1) it is extremely highly available (2) the person who uploads a program cannot modify that program afterwards and has no special admin access over that program's data storage; furthermore all data stored including program code is publicly viewable.

Because the program author has no admin privileges, users don't have to worry about the service provider abusing their admin privilages to secretly modify the database (which may otherwise be a concern for high-value applications such as, e.g. vote-counting, e.g. a database that stores bank account balances, etc).

The disadvantages are (1) it is much more expensive compared to other cloud computing services, (2) since the uploader doesn't have admin access, they can't fix bugs, and since everything is transparent, it's hard to store secrets.

[xHopen]

It takes some time to wrap your head around the blockchain, first you have to understand Bitcoin , then you will have no issues understanding Ethereum. But I tell you one thing, once you understand it, you will not stop thinking about it.

https://www.youtube.com/watch?v=3RN8bnNe-Is

[jk4930]

Healthy young child discovers Ethereum, gets pumped with massive shot of many tokens, feels good and changes - AUTISM. Many such cases!

[ym705]

I dream about blockchains. Yeah it's true, not only the technology is interesting but also the community and all the ecosystem behind cryptocurrencies.

[xHopen]

And this is just the beginning.