Questions tagged [addresses]
Addresses are the particulars of names, domains or accounts on the blockchain.
486
questions
2
votes
0answers
11 views
How to calculate vanity address using C?
I have a curiosity about tacking on zeroes to strings, and Ethereum addresses are no exception. I wrote my own python program, and it was too slow. I wrote the program at https://pastebin.com/hTFGiKzR ...
1
vote
1answer
34 views
Different address make same signature for one message
Is it possible two different wallets (address) make the same signature for one message?
I have one message: '...
0
votes
0answers
8 views
Any idea how to add new contracts into drizzle react app using the address?
I have a react app which creates new contracts. lets say A creates B.
I have the addresses of the newly created contracts of B.
How do i add the newly created contracts of B using its address to ...
0
votes
0answers
28 views
Unable to Unlock Account Even After specifying allow-insecure-unlock
Software: Ubuntu on VirtualBox
Update, tried putting two dashes, on allow-insecure-unlock, doesn't work
solidity@solidity:~$ geth attach http://127.0.0.1:8545 --allow-insecure-unlock
Incorrect Usage:...
0
votes
1answer
15 views
invalid implicit conversion from contract to address requested contract
I am using this function to create a new contract instance of Match contract which takes 4 parameters.
However i am getting this error message "invalid implicit conversion from contract to address ...
0
votes
1answer
26 views
The method eth_sendTransaction does not exist/is not available - web3.py
I am trying to send data to the contract, but I am getting the following error:
The method eth_sendTransaction does not exist/is not available
This is the code:
from web3 import Web3
web3 = Web3(...
0
votes
1answer
29 views
Solidity. Concatenate and hash two strings
Hi all I need tho sha256 two strings. I am new to solidity. This is what I've got:
function addressToString(address _addr) public pure returns(string memory)
{
bytes32 value = bytes32(uint256(...
0
votes
1answer
19 views
Solidity. Concatenate hash w address. TypeError: Operator + not compatible with types string memory and address payable
I am trying to do something simple:
examsFinalHash = keccak256(examHash + msg.sender);
but I get the following error:
TypeError: Operator + not compatible with types string memory and
address ...
0
votes
1answer
23 views
Generating an address from a public key in C++
Example:
Input key = 0x025f37d20e5b18909361e0ead7ed17c69b417bee70746c9e9c2bcb1394d921d4ae
Output address = 0xd09D3103CcABfb769eDc3e9B01500Ca7241D470A
I have been using an algorithm from keccak-tiny....
0
votes
1answer
28 views
How can I implement redactable chain for ETH?
I am trying to research about Redactable blockchain so my question is how can I implement a Redactable chain in Eth if someone has some idea about it I will be thankful
2
votes
2answers
40 views
How to generate a new token for ERC1155?
Developing an ERC1155 contract, how to generate an address for a new token?
I need to create an API function like function createToken() returns (address). How?
Should I just use an incrementing-by-...
0
votes
0answers
28 views
Ethereum payment processor Nodejs
I'm working on a web project where I need to have the ability to accept crypto payments. Implementing bitcoin was fairly easy as there were api's whom allowed me to directly subscribe to a specific ...
2
votes
0answers
40 views
Combine two addresses into one
I want Solidity code to define a function f that would map two Ethereum addresses A, B into a new address X = f(A,B) such that there is nearly zero probability that X is an already taken address (an ...
1
vote
1answer
28 views
Invalid opcode when trying to pass address as parameter to contract
When I try to pass address as parameter to this addEmployee function it gives me this error:
invalid opcode
The execution might have thrown.
Debug to get more information.
modifier onlyOwner(...
0
votes
1answer
29 views
TypeError: Type contract Campaign is not implicitly convertible to expected type address [closed]
pragma solidity ^0.5.11;
contract CampaignFactory {
address[] public deployedCampaigns;
function createCampaign(uint minimum) public {
address newCampaignAddress = new Campaign(...
0
votes
1answer
32 views
Solidity. How to add an address to a mapping
I have this:
contract Diary {
string[] private facts;
mapping (address => bool) approvedAddresses;
address owner;
constructor() public {
owner = msg.sender;
...
5
votes
2answers
169 views
Common Gas Wallet for ERC20 Wallets?
We have a wallet structure where users send tokens to individual user wallet addresses generated for them, we then sweep all the funds in the user's wallets to a centralized pool. The individual ...
2
votes
1answer
42 views
How to transfer wei from a contract to a specific address?
I was making an auction system and I wanted to make sure that when someone bid higher the contract would return the money to the address of the previous bid.
pragma solidity >=0.4.22 <0.6.0;
...
2
votes
3answers
187 views
How smart contract transactions work?
I read that smart contracts don’t have a private key, so they can’t sign a transaction. My question is: when a smart contract starts a transaction to an EOA, how are we sure that the smart contract ...
0
votes
1answer
37 views
Is there any API to create Addresss and wallet as well as make transfer for ETC (Ethereum Classic)?
There is balance checking, transaction list and transaction receipt getting APIs available for Ethereum Classic (ETC)?
Is ETC coin is only available on Ethereum Classic or its listed block explorer ...
0
votes
1answer
77 views
I would like to 3 mappings
I am a beginner.
I would like to 3 mappings
I know 2 mapping looks like this:
mapping (address => mapping (address => uint256)) public allowed;
and my question is: is 3 mappings look like ...
0
votes
1answer
30 views
Why does etherscan show such unusual results for the creation of this specific contract?
Normally, when I browse for the address of a specific contract and then click the contract-creation transaction label, I get:
To: [Contract 0x... Created]
For example, consider the BNB contract at ...
0
votes
1answer
35 views
ICAP 34 characters long. What's this kind of ICAP?
My understanding is that an ICAP address will have 33 characters for Direct or 35 characters for Basic, thus I've generated some 34 characters long ICAP addresses using:
helpeth keyGenerate
In ...
1
vote
2answers
35 views
How to check if an address is an active contract in Vyper?
Often for security reasons I want to limit certain address parameters to non-contract addresses for certain functions in my contracts, ie. there are no code stored on the addresses passed in as ...
0
votes
1answer
28 views
One smart contract deployed on 2 nodes will have same address?
Let's get creation of a smart contract address out of the way:
The address for an Ethereum contract is deterministically computed from the address of its creator (sender) and how many transactions ...
0
votes
1answer
15 views
Address Payable and New Contracts
The following compiles in 0.4.26, but not 0.5.0. The error is "Type contract CustList is not implicitly convertible to expected type address." I figure it's something with address payable, but I have ...
2
votes
1answer
58 views
How does EIP-55 prove a string is ACTUALLY a valid Ethereum address?
I wonder how EIP 55 check proves an address is actually an Ethereum address, or does it prove this at all?
Am I missing an obvious point in Vitalik's code below from EIP 55?
from ethereum import ...
0
votes
0answers
15 views
After generating Address, how to checksum it? [duplicate]
After generating address for example "0x8c1821a90ecce75ec2901633b2c9164cf9406b54" what is the algorithm to generate checksummed address to "0x8C1821A90EcCE75ec2901633b2c9164CF9406B54". Although, There ...
2
votes
1answer
102 views
0x0000000000000000000000000000000000000000 address behaviour
I have a question about the possibly strange behaviours of address:
0x0000000000000000000000000000000000000000
We know that:
ETH + ERC20 tokens sent there are burnt
Upon creation of a new smart ...
1
vote
1answer
15 views
Scope Issue: Not successfully storing accounts after using web3.eth.getAccounts()
I am having trouble with the following code:
var accounts = []
let accounts = await web3.eth.getAccounts((error, result) => {
accounts = result;
console.log(accounts);
});
console.log(...
1
vote
1answer
22 views
Find keyfile of an account
I have several accounts in my Geth wallet. I need to locate the keystore file of a given account but there doesn't seem to be any connection between the keystore file names and the accounts. How do I ...
2
votes
1answer
92 views
Convert address to string after solidity 0.5.x
After solidity 0.5.x release none of conversions from address to string appear to be working. I've tested all of them on remix and got errors like converting bytes to uint or something like this.
...
0
votes
0answers
32 views
The reasons behind using public/private and addresses?
I understand that we need a public/private key so anyone can sign a message and miners can verify the signature using the public key. But, In this Question Relationship between Ethereum Address and ...
1
vote
1answer
36 views
How can I send ether [duplicate]
Hey guys I am a beginer on Solidity. I write a function and try to send ether on remix accounts and check balances this accounts. But I can't connect accounts I think because when I check balance of ...
0
votes
2answers
141 views
Unused function parameter. Remove or comment out the variable name to silence this warning
I have a smart contact which have 2 owner address and 3 functions.
my set functions is set a users with msg.sender and my getUser functions is returns name,surname and age and I want to add a admin ...
0
votes
1answer
117 views
Member “name” not found or not visible after argument-dependent lookup in string storage ref
I have code like this and I want to set my name, surname and age in my struct so I want to set them and get them using with my functions
here's my code :
pragma solidity >=0.4.0 <0.7.0;
...
0
votes
0answers
25 views
Are there any examples of ETH addresses that periodically send or receive funds at regular intervals?
I'm looking for any known ETH addresses that send or receive money at regular intervals. For example, once per day, an amount from a hot wallet might be sent to a cold wallet. Are there any widely ...
0
votes
1answer
98 views
member not found or not visible after argument-dependent lookup in mapping
pragma solidity >=0.4.0 <0.7.0;
contract New{
mapping(address => string) public users;
string name;
address[] public userAddress ;
//string[] public userNames;
...
0
votes
1answer
236 views
Type string memory is not implicitly convertible to expected type struct InsanFactory.User storage ref
pragma solidity >=0.4.0 <0.7.0;
contract InsanFactory{
struct User{
string name;
address myaddress;
}
mapping(address => User) public userStructs;
...
0
votes
1answer
15 views
Is possible for a contract to manage and hold different address and its balance for different erc20 tokens?
Imagine an exchange contract to store and handle different accounts for different buyers and sellers, it is possible for a contract to manage and hold different address and its balance for different ...
0
votes
1answer
251 views
MetaMask - RPC Error: Error: WalletMiddleware - Invalid “from” address
I'm trying to create a simple Dapp (via tutorial) which would allow me to send Ether from sender to receiver (via a contract with an address that automatically approves the transaction). The truffle ...
1
vote
1answer
134 views
Solidity: Convert from “bytes memory” to “address”
I'm using solidity 0.5.0 and when i try to compile my contract it's giving me this error
Explicit type conversion not allowed from "bytes memory" to "address"
my code is this:
/// @dev get broker ...
0
votes
1answer
123 views
How to convert Postgres BYTEA format to Ethereum string address (PYTHON)?
Bytea (hex) is format of PSQL. It is used by many explorers/dapps/apps to store ethereum address. how to convert this format to Python String?
By default it is read as a memory view.
More on Bytea: ...
1
vote
1answer
87 views
How does one query the Ethereum ENS name service via an API endpoint with a JSON response?
Using the https://ens.domains/ is there a way to query the ENS name service using an API endpoint and get a JSON response? I want to be able to integrate these eth addresses into my application.
0
votes
2answers
22 views
web3js returns non-checksumed addresses!
Why does web3js 0.20.6 returns all-lowercase addresses on contract creation not a checksumed address?!
How to deal with this trouble?
2
votes
1answer
27 views
Event and method different address type
This is my contract
pragma solidity ^'0.5.2';
contract MyContract {
address[] public contracts;
event ContractCreated(address newAddress);
constructor() public { }
function ...
0
votes
1answer
82 views
how do etherscan get all the token balance of particular address?
I want to create service where just by providing address i can fetch all the token (erc 20 & erc721) balance just like etherscan for a private network?
is there any way to do it by writing for ...
0
votes
1answer
23 views
Can I have a listener to cryptocurrencies / tokens reaching a specific address?
Let's say that there is an address called 0x1
There is another address called 0x2 which just released a new token called ABA.
Is there a way to constantly listen for 0x1 to see if it receives ABA ...
0
votes
1answer
40 views
How to choose contract address and wallet address
When you start an ICO, to receive a fund from people for your ICO, how do you choose the contract address and your wallet address to receive ETH collected for your ICO?
Thank you.
And excuse me for my ...
0
votes
1answer
76 views
How can I push data to array when using mapping (address => address[]) mappingName?
What is the exact syntax to push data using the above given syntax?
