Questions tagged [addresses]

Addresses are the particulars of names, domains or accounts on the blockchain.

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Total Unique Addresses Count of Ethereum Classic

I need to find an API giving the total number of unique addresses used on the Ethereum Classic blockchain. For example, the following API provides it for Bitcoin: https://api.blockchain.info/charts/n-...
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tracing new address on new wallet in Ethereum

I am just wondering how the new addresses are anonymous in Ethereum. Suppose that I have a wallet A including many addresses on it. Then I have a new wallet, say wallet B, and opening new address on ...
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Which contract's address?

In Etherscan, it is easy to find a contract. For example here is an example: https://etherscan.io/address/0x80fB784B7eD66730e8b1DBd9820aFD29931aab03#code The web page says that the contract address ...
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How to find the coin/token type of crypto payer in Ethereum blockchain?

I'm new in Ethereum based crypto concepts. I would like to know how can I differ the incomming crypto amounts based on their orginal token type? Imagine I have an address on Ethereum blockchain. ...
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Reinstalled MetaMask, account lost?

I had 3 accounts under my MetaMask Chrome extension. One of them had some small deposit. I have reinstalled the extension and used seed phrase to get access again. However, I can see only one account (...
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Correct ABI payload packaging to call another Contract's address

Let's suppose I have the two following contracts, Dest and Proxy: pragma solidity ^0.5.0; contract Dest { function foo(string memory name, string memory symbol, uint256 decimals, uint256 ...
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Change a Checksum Address to Its Normal Hex Value

I know there are functions to convert hex address -> checksum address, but are there any to convert checksum address -> hex address?
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Is there any difference between address that have Smart Contract and “normal” one? [duplicate]

Is there any difference between address that have smart contract on it, and "normal" address (address that You can create private and public key pair)? For more context, this is the problem I'm ...
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Is any 40 character hex string a valid ethereum address?

I know an ethereum address is generated by getting the last 20 bytes of the keccak-256 hash of the public key, which is 40 hex digits. I also know, an address does not need to have transactions ...
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How to calculate vanity address using C? [duplicate]

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 ...
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44 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: '...
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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 ...
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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:...
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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 ...
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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(...
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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(...
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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 ...
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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....
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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
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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-...
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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 ...
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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 ...
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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(...
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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(...
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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; ...
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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 ...
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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; ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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120 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 ...
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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(...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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159 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; ...
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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 ...
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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; ...
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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; ...
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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 ...
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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 ...