Questions tagged [addresses]

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

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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 ...
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1answer
527 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 ...
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389 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: ...
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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.
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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?
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1answer
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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 ...
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2answers
405 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 ...
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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 ...
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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 ...
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280 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?
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How do I get the address from a signature?

As stated in the question, I have the v, r and s values of a signature given and am trying to find the belonging address. All questions similar to this solved it by either using a solidity smart ...
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Why does return address(player) return a weird string?

I am trying to get the player's address through front end and when I run through the solidity function that should return the player's address, it would return ...
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1answer
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Enigma “secret contract” and concealing transactions history: How is it possible?

Enigma protocol is a second-layer, off-chain network that aims to solve privacy issues in blockchain. However In Enigma blog, there is an article (Link to Article), explaining the secret contract, ...
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can I return an address from a contract interface instead of another contract?

for example i have a contract function that returns a contract, can I define an interface that calls that function, but only returns an address? contract foo { .... .... } contract bar { ...
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How to generate an ethereum address?

How an EOA, contract address can be achieved? What is an mechanism for generating these?
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1answer
317 views

Convert 64 byte public key to 20 byte address in Solidity

I am trying to convert a 128 characters hex encoded public key to an address in Solidity (0.5). For example the pubkey would be: ...
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1answer
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How to generate multiple ethereum addresses using HDWallet?

const mnemonic= 'clown shiver beach wheel this mixture emotion illness fatigue amateur talent bitter' console.log(`0x${hdwallet.derive(`m/44'/60'/0'/0/0`).getAddress().toString('hex')}`) ...
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is account nonce network dependent?

In Ethereum, does Account nonce depend on network? I mean for same address on different network, will there be different nonce?
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I found 4 very similar wallet addresses. How is this possible?

These are the addresses: 0x7cB57B5A97Eabe94205c07890BE3C1aD31E486A8 0x7Cb57B5a97EaBe94205c07890bE4C1aD31E456a8 0x7cB57B5A97eAbe94205C07890BE4c1aD31E486A8 0x7CB57b5A97eabe94205C07890beaC1aD31E486a8 ...
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find out network using contract address

I know that in Ethereum, same addresses works across the network(mainnet and all testnets). But I am looking to know if there are any chances to find out the network on which a contract is deployed ...
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1answer
262 views

msg.sender 'spoofing' when function is public or external

I have a Smart contract where I want only the onwer to call a specific function, for example: function getInfo() view public onlyOwner() returns (address) { return msg.sender; } ..... modifier ...
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What DSAuthority(0) and eos.owner() means and does?

In ERC20 EOS crowdsale contract, what these three lines(469-471) does? function initialize(DSToken eos) auth { assert(address(EOS) == address(0)); //[Someone explained this line here][...
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Is it likely to receive more token airdrops to one of the original Ethereum addresses from the crowdsale?

Is it likely to receive more token airdrops to one of the original Ethereum addresses from the crowdsale? Hi there, I participated in the original Ethereum crowdsale and I used to store a certain ...
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Ecrecover wrong address is returned

I'm trying to validate signed data with ecrecover. The message is signed like this on the FE: return this.web3.eth.personal.sign( `${nonce}`, publicAddress ).then( ( signature ) => { ...
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truffle pet shop example question(address convert) [duplicate]

I have some question about truffle pet shop example ,here is the original link pet shop, when I work this command:truffle test , and I have some compile problem. here is original code: I have some ...
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1answer
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A solidity 0.5.x function to convert adress-string to ethereum address

I'm looking for a Solidity 0.5.x compatible function to convert a string with and address like "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe" into a real address. I did use this function: function ...
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1answer
277 views

Initial ERC20 Token supply split into 2 or more hardcoded addresses

don't know if someone can help me, but let me explain my problem. For more transparency in my ERC20 token generation smart contract, I want to hardcode the Team Pool (0xA) and Crowdfunding Pool (0xB) ...
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402 views

Check if a variable exists in external contract

kinda new to the development side of Ethereum. Been searching around for days but can't seem to find an answer for my specific case. I'm trying this challenge here. The problem is that I can't seem ...
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Revert Assert best option

I have a contract(A) function with the standard onlyOwner access. If I call directly from the deployed account the function works fine. But when I import this contract(A) into another contract(B) and ...
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How to pass the whole array from one contract to another when working with different solidity files?

For example, I am taking one function function transferAddresses() in my contract contract one{} from where I am taking number of addresses in array. Now I want to transfer the whole data of the array ...
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Contract deployed address

Is there a way to save the deployed contract address into a variable. Something related to a constructor that save the deployed address into the variable?
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1answer
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Type contract is not implicitly convertible to expected type address

what is the wrong with this function i can't get the address of LenderRegistration contract mapping (address=>address) lendersToContracts; function lenderRegister(uint256 ...
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1answer
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How to map one to many

I am working on rent agreement and I have a situation here One landlord can have multiple properties every property have different details (property details, values) now I want to link property ...
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4answers
2k views

Convert contract to payable address

Not sure how to successfully convert a contract to a payable address.. ERC721 public nonFungibleContract; function withdrawBalance() external { address payable nftAddress = address(...
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Unable to resolve TypeError

I'm looking to ensure that an address is not the 0 address and with the update to 0.5.0 I am running into a TypeError Operator != not compatible with types contract GeneScienceInterface and address ...
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1answer
285 views

Solidity : Error when pushing an address into a dynamic address type array

I'm trying to insert an address into an address type dynamic array. It works well when I do the operation inside a function. There are no errors and the elements are properly pushed into the array. ...
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1answer
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Problem with array of adresses

I have following code of my smart contract, it has simple problem: browser/Referrals.sol:100:35: TypeError: Type function (uint256) pure returns (address[] memory) is not implicitly convertible ...
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2answers
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Find the address of the wallet know almost all the letters

I want to find ethereum address and I have almost all the letters. The beginning of the wallet: 0xb6b2ceb624a6b667e67af1893b16706baec21 But how can I find remaining letters?
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Changing “proxywallet” in “local.config” in ethOS, but I receive mining reward in previous address

I've changed my proxywallet from proxywallet 0xB4... to proxywallet 0x5B... in the local.config file. However, I received mining reward again in previous address: 0xB4... . Do I need to restart the ...
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1answer
435 views

Recover public key from transaction signature

I have this transaction: { "blockHash": "0x163ad564b32bf17db9262391c2c9a5f191e4fd0b098ae5ce9d2e3e7dcde4bd70", "blockNumber": "0x2", "from": "0x55d40a83b8445c004df5964ce4a0e261b599c01a", "gas":...
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1answer
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How do I get product/parcelID from particular Assigned address using struct and mapping?

struct Sellers{ address sellerAddress; uint parcelId; uint parcelPrice; } In this struct I've entered multiple parcel Ids to sellerAddress and I've retreived them using _sellerAddress. ...
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Is there a way to figure out if 2 (or more) address is belong to same HD Wallet account or not?

I'm a new to Wallet concept, I know that a HD Wallet structure is created from a root seed as Mnemonic Code, from that HD Wallet help to generate child keys as the meaning of multiple difference ...
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What useful information can we get from ethOS mining log?

What useful information can we get from ethOS mining log information ? For example, can we find the ethereum address of this miner from this log information ?
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Solidity 0.5.x - make address array payable

I'm trying to write a contract that uses an address[] array which should contain payable addresses. But apparently creating a payable address array doesn't work in solidity 0.5.x. All I'm trying to ...
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1answer
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TypeError: Data location must be “memory” for return parameter public view returns (address[16]){

I know that is question has been answered in one form. However, I could not find an answer for my specific case. Here is my code: pragma solidity ^0.5.0; contract Adoption { address[16] adopters; ...
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How to view ENS name from transaction?

This is ethereum address. On which there are a bunch of registered ENS names How can we view the actual ENS names which were registered/won in auctions from this address?
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Does a storage array have a unique address on the block-chain?

The question in the title is a little vague, so I will try to explain here. Suppose I have a contract with a storage array: pragma solidity 0.4.24; contract MyContract { uint256[10] public ...

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