Questions tagged [access]
The access tag has no usage guidance.
27
questions
1
vote
1answer
26 views
Access control for blockchain
I am kinda new to blockchains and solidity. I am trying to create a smart contract that can keep track of inventory as well as be able to order new things if necessary. I would like it to have some ...
0
votes
0answers
30 views
Get struct from mapping that include another mapping
I have an already deployed contract with a mapping that looks this way:
struct Details {
address a;
address b;
}
struct Params {
uint a;
uint b;
//.....
uint n;
mapping(address =&...
0
votes
0answers
23 views
Metamask recovery
Hi there can i ask for help please? I installed metamask back in June 20 as a first time just to get used to it and trial some liquidity pooling. After about a few days I got frustrated and decided to ...
0
votes
0answers
76 views
Implementing Roles using OpenZeppelin's AccessControl.sol
First time poster so please go easy!
I'm new to Solidity. Have been programming about 2-3 years & I'm working on an Ethereum supply chain dapp for a college project. I've got to the point where I ...
2
votes
1answer
29 views
Accessing struct members
Can we access the struct member using a variable as we access in JavaScript? For example:
struct Abc {
uint256 a,
uint256 b
}
Abc xyz;
string memName = 'a';
I want to do something like ...
0
votes
1answer
2k views
VM error: revert.The called function should be payable if you send value and the value you send should be less than your current balance
There is already a similar question, but it doesn't help me. So I ask this question again and expect something useful information.
Two contracts named AccessControl.sol and Judge.sol. I've removed ...
0
votes
1answer
147 views
Need a guide to access my ropsten test network contracts through my command line and not remix
I have written and published a contract on the ropsten test network using remix. Now I want to access the functions of the smart contract from my command line (My PC) and not the remix IDE. Is there a ...
3
votes
1answer
4k views
VM error: revert. revert The transaction has been reverted to the initial state. Note: The called function should be payable if
Hi Guys 👋
I have two contacts first one is SubToken and second one is MainContract.
First I deploy MainContract after that I use createNewContract function and I create new SubToken.
and then
I ...
5
votes
1answer
2k views
TypeError: Indexed expression has to be a type, mapping or array (is function (address) view external returns (string memory,string memory…)
I have 2 contracts first one is sub second one is main .
First i deploy main and create a new subtoken.
Then I want to access my maincontract in subToken contract but I cant :(
When I compile this ...
0
votes
0answers
19 views
How to verify access of child contracts?
I am using a factory A to produce child contracts. Now I want to guarantee that only these child contracts have access to a different contract B.
Using the factory as a proxy is somehow a detour as I ...
2
votes
1answer
69 views
Is there any way that smart contract can access xacml policies?
I am trying to implement role based access control model using blockchain. How do i store these policies? Later my smartcontract should be able to allow or deny the rquest of user based on policie.
...
1
vote
2answers
194 views
Decentralized Access Control in permissioned Blockchain
For a business use case I am conceptualizing for my master's thesis, which is based on a Blockchain system, I need to understand impacts on decentralization/trustlessness.
Many people argue that ...
2
votes
2answers
102 views
Make Smart Contract Only Accessible from a Web App
I have got a Solidity smart contract which only interacts with a React front-end using web3. I want to restrict access to the smart contract so that only the React front-end can access the smart ...
0
votes
0answers
58 views
Controlling access to functions with VIEW visibility with signed transactions?
Controlling access to functions that require ETH is straight forward because you get an address you can trust because it has been signed and verified, and therefore upi can use for access control ...
2
votes
3answers
1k views
Accessing not public variables
Is it possible as the creater of the smart contract to access a not public variable? E.g.:
contract MyContract {
uint256 someLevel;
function changeLevel(uint _newLevel) public {
...
0
votes
1answer
2k views
Move ERC20 tokens from Ethereum Wallet Contract to Account
In my Ethereum wallet i am trying to access my wallet conract. If I sync in light mode and import the wallet contract address it just stays there displayed, greyed out and nothing happens, no matter ...
0
votes
1answer
323 views
Allow access to private ethereum network from certain IP only
I have a question regarding restriction access to private etehreum network.
I created my Private Etehreum network using Geth(for now just only with one node) on the Ubuntu 16.04 virtual machine.
And ...
0
votes
1answer
71 views
Fast access of any given transaction in the blockchain
That is a conceptual question that I am asking here. We are trying to developp an application to securely store the hashes of some files in the blockchain. Everything is automated (taking a file as ...
1
vote
1answer
673 views
Smart Contract Execution Rights - Can everyone who knows the public address of a smart contract call the smart contract?
Say I have a contract with the address and method below.
myContract.at("0x9f8cedf1f93e46fac74cb9415db8bbec85f239b4").greet();
Can everyone who knows this address call this smart contract method? Any ...
1
vote
1answer
23 views
Accessibility and security of the contract within a contract as a variable
Say I have one contract:
contract Token {
uint totalSupply;
function Token() public {
totalSupply = 0;
}
function mint() public{
//Do minting
}
}
And then an ...
1
vote
1answer
23 views
Address Not Getting Stored Correctly in State Variable?
I am trying to write a contract where the originator of the contract will offer a reward that can only be claimed by a different address that she or he specifies. To do that, I am trying to create ...
0
votes
1answer
236 views
Off-chain database and access control management by smart contracts
I am thinking about an application which consists of two main components; off-chain database and ethereum blockchain for managing the accesses to the off-chain database. Is there any similar sample?
...
2
votes
1answer
257 views
Smart Contract to access to website
We want to create a simple smart contract:
After the click of a "pay"-button, you have to pay automatically 0,01 ETH to our wallet and you can visit after the confirmend transaction a website/link/...
3
votes
1answer
2k views
Where is ethereum and etc stored on my desktop when using Jaxx wallet?
There was an error when opening my jaxx wallet for windows 10 desptop (containing eth and etc), and my computer suggested to reinstall the application. Without thinking, I deleted the jaxx files (but ...
1
vote
1answer
415 views
Presale wallet gives zero funds
I have already asked this question but I post once again as helpdesk people at ethereum are asking to post here:
After several years of waiting, I have decided to check how much ether I do have in my ...
2
votes
1answer
752 views
What is the best way to write into a byte variable at a predefined position?
According to the Solidity documentation one can access the byte at position k in for example a Bytes16 variable source with the following code:
pragma solidity ^0.4.8;
contract example {
Bytes16 ...
1
vote
2answers
165 views
What is the best practice between setting a variable public or using getters in Solidity?
From the solidity.readthedocs, a variable declared as public does not need a getter since an automatic accessor function is generated e.g:
pragma solidity ^0.4.2;
contract C {
uint public data;
}...
