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Results tagged with contract-development
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user 41014
Questions regarding the development of smart contracts
0
votes
Is this token code only or crowdsale code as well
this is token code
ERC20 is the common interface
MONT is the implementation of that interface
SafeMath is a library for safe mathematic operations (avoiding under/overflow)
Owned is a contract to …
- 994
1
vote
Accepted
How to get the address of a contract deployed by another contract?
Your function is not a view function because it modifies and thus will be a transaction so it will not return a value , simply the tx receipt.
The value can be returned to another function however, j …
- 994
1
vote
Accepted
Any coding games made for learning how to build out ethereum smart contracts?
Cryptozombies is cool indeed,
also check out https://ethernaut.zeppelin.solutions/
- 994
-1
votes
Why do we distinguish between view and pure?
I find the answer above confusing. It really boils down to this:
Pure does (can) not access state only memory/stack
View can access state but not make changes to it, just query (+ ETL).
No state c …
- 994
10
votes
Accepted
Why to write return statements in solidity function
In Solidity you can return values from functions to the user if these functions are declared view(/constant).
When they are not declared as view you can still get a return value by using .call() this …
- 994
5
votes
Accepted
Any Pseudo Random Number Generator that can generate different numbers in the same block?
You can use an incrementing nonce each time a number is generated. This would have a large effect on the hash output.
Random 0-100 Example:
contract Random {
uint nonce;
function random() …
- 994
0
votes
Security analysis tool for Ethereum smart contracts
Mythril is by far the best tool available, takes some getting used to though.
Great introduction and overview:
#HITB2018AMS D1T2 - Smashing Ethereum Smart Contracts for Fun and ACTUAL Profit - Bernh …
- 994
5
votes
1
answer
921
views
Get return data from delegatecall
I'm using a low level delegatecall to forward my calls to a library.
I need to (in this order) :
load bytes4 sig into _message from memory
load bounty (STRUCT) into _message from storage
load byte …
- 994
1
vote
Trouble with libraries (Remix)
You have no uint defined in your storage to use the library on, also your library functions can be pure.
below using IntExtended for uint
add
uint myUint
and then you can call the library functi …
- 994
0
votes
Is it possible to do an escrow for ERC20 Token
You need to know the address of the token, allow the user to store this.
You need to instantiate the token contract at that address so you can call it's functions
You need to use approve() on the cli …
- 994
0
votes
Smart Contract - Update implementation using a Relay with delegateCall
Here's an example for upgradeable libraries.
https://github.com/kyriediculous/knuckles/tree/master/contracts/contracts
I'm currently working on cutting it down.
There's a central registry to keep …
- 994
4
votes
Accepted
Where are finally ethereum event logs stored?
You can trust the logs because they are stored in their respective block. If a log gets changed it would change the blockhash, receiptRoot, etc , same as with transactions. The merkle tree would not b …
- 994