These are chat archives for ethereum/tutorials

24th
Aug 2017
mateagun
@mateagun
Aug 24 2017 04:02
Dear Expert,
I am newbie of Ethereum and I have been trying to create the smart contract by Test Network, it does not work. FYI, I want to have it by 0.00 ETH balance. Thank you
metabol
@metabol
Aug 24 2017 08:28
@mateagun Mine some test eth
metabol
@metabol
Aug 24 2017 08:33
Henrique Leite
@falehenrique
Aug 24 2017 11:57
Jpeng0108
@Jpeng0108
Aug 24 2017 15:19
what does uint256 mean in the code?
Brooks Boyd
@MidnightLightning
Aug 24 2017 15:32
@Jpeng0108 a 256-bit unsigned integer
Howard Yeh
@hayeah
Aug 24 2017 16:17
I wrote an article about how Solidity arrays are compiled to EVM assembly. Should be interesting if you are curious to learn more about how Solidity works under the hood. https://medium.com/p/diving-into-the-ethereum-vm-the-hidden-costs-of-arrays-28e119f04a9b
Henrique Leite
@falehenrique
Aug 24 2017 18:47

Hi Guys, is it correct I say that Blockchain is good to validate transactions saved in privates systems?

Because, I am studying and I Understood that doesn’t a good a idea use the Blockchain to save every kind informations, the better is save the Hash of the transactions.

Is it correct?

Brooks Boyd
@MidnightLightning
Aug 24 2017 19:13
A blockchain could be used to store signatures of a hash (and the hash relating to something outside the chain), that would effectively be just taking the existing PGP/GnuPG ability to create a detached signature of a document and making those detached signatures a public ledger.
Henrique Leite
@falehenrique
Aug 24 2017 19:47
@MidnightLightning ok!! I'm curious how to implement this in these business areas( Financial Services,Telecom, Insurance, Supply Chain, Healthcare )
Because the information will be off chain too.
eddie2024
@eddie2024
Aug 24 2017 22:11
I;m trying to use the crowdsale example from ethereum.org. Whenever i try to send ether from a different account, even after approve & calling the crowdsale contract with the desired amount. the trans fee is 5-10 ether and it never completes. I don't get it. Does the contract require ether in order to be able to distribute the tokens? If anyone could help, would be much appreciated :)
gabrielmoreira1975
@gabrielmoreira1975
Aug 24 2017 22:41
Hi guys, I'm very new here and I'm trying to compile the The Shareholder Association code but I'm having the follow error:
"throw" is deprecated in favour of "revert()", "require()" and "assert()".
if (p.voted[msg.sender] == true) throw;
^---^
Someone here can support me how to fix it?
phalexo
@phalexo
Aug 24 2017 22:43
require(p.voted[msg.sender]);
gabrielmoreira1975
@gabrielmoreira1975
Aug 24 2017 22:53
Changing to require o got: Variable is declared as a storage pointer. Use an explicit "storage" keyword to silence this warning.
string description;
^----------------^
@phalexo did you answer for me right?
gabrielmoreira1975
@gabrielmoreira1975
Aug 24 2017 23:12
Someone have Shareholders Code that compiles to share?