Questions tagged [addresses]

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

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20
votes
3answers
4k views

Account uniqueness guaranteed?

When we create an account in the Ethereum main network, how does the protocol guarantee the unique address of an account? Since even if we are not connected to the network we can create an account, is ...
6
votes
3answers
2k views

How to find all token holders?

For example, the contract saves the address when token created but after that token holder could send token or all tokens to another wallet. Is it possible to find all wallet addresses of token ...
6
votes
2answers
5k views

Are funds returned if one transfers from an exchange to an invalid Ethereum address?

I transferred some ether form an exchange site to an invalid address (invalid in that the correct address was trailed by 6 numbers I accidentally pasted in). Looking for that address on Ethereum ...
3
votes
1answer
629 views

Can I delete “address” field from the ethereum key file?

I don't like that anyone who reads my encrypted ethereum JSON key file knows my address and balance. Can I delete the "address" field and still be able to import that file into geth and MyEtherWallet?
5
votes
3answers
14k views

How to transfer Ether between accounts in Solidity?

I'd like get ether balance of account in solidity. I tried the following, but it didn't work. Could you tell me how to do it? contract MultiplyContract{ address public buyer; address public ...
2
votes
1answer
662 views

Find contract address inside the contract?

How to find contract address inside a contract method? I mean the address of the instance of the contract.
6
votes
2answers
2k views

Find address which called the method?

How can a contract method find the address which invoked it? Suppose I have a contract A with method B. I used xyz address to call method B then how can method B see xyz address.
113
votes
4answers
77k views

How are ethereum addresses generated?

What criteria does a valid Ethereum address need to fulfill? Is it just a random number in hexadecimal? Or does it need to be derived in a specific way, according to some cryptographic algorithms? ...
2
votes
1answer
3k views

My MyEtherWallet address is different than the first address it gave me

I invest to TheDAO this week and I don't see my transaction. My address is: 0x72eb41AE7f943445Da9932662d31A06D56A3cfAa But when I look my wallet whith my private key I see an other: ...
6
votes
2answers
539 views

How many Ethereum contracts have been published?

Is there a place to see how many Ethereum contracts have been published? If someone wanted to calculate that, it would just be total number of accounts minus accounts with code, right? Any ...
5
votes
0answers
216 views

How to backup and restore accounts in the Ethereum wallet [duplicate]

How can I use the Ethereum wallet to restore the account, before this I have backuped that account and the client generate an UTC file, how can I use this file to restore my account?
7
votes
1answer
3k views

How to get address from private key in java

I use generate a private key in java code HashUtil.sha3("cow".getBytes()) Write to a new private key file: c85ef7d79691fe79573b1a7064c19c1a9819ebdbd1faaab1a8ec92344438aaf4 Then, I use geth account ...
28
votes
2answers
10k views

How to encrypt a message with the public-key of an Ethereum address

I am writing some code in nodejs/browser. I have successfully created ethereum-addresses with the secp256k1-library. I was also able to sign and verify messages. Now I want to encrypt/decrypt a ...
17
votes
1answer
4k views

How Can I Add My Name Next To Address On Etherscan?

I'm wanting to set up a charity and want to use a public wallet for accepting donations with on Etherscan where I can have a displayed name next to the wallet like this: How Can I Add My Name Next To ...
13
votes
3answers
3k views

Multiple transactions from same address

I would like to create multiple transaction from the same address at the same time. Since every transaction needs nonce (tx count of the sender address) I can ask geth for the current count and create ...
2
votes
0answers
73 views

How do you generate an address identicon using javascript? [duplicate]

Given an address, how do you generate its identicon using javascript?
3
votes
1answer
785 views

How to get address of contract from inside the contract?

contract FooContract{ address myAddress = ?? } How to get the address of a contract from inside (the contract itself)?
4
votes
1answer
859 views

Is it possible to brute force account creation in order to steal ether?

Ethereum users could generate new accounts for each transaction they make, which would greatly increase the number of accounts being used to receive ether. Would it be possible (and profitable) for ...
20
votes
3answers
18k views

How to list transactions from account address?

I have a small service where people can exchange cryptocurrencies. Every user has its own Bitcoin, Litecoin, etc address for balance deposit. Now I want to add Ethereum. So I thought I will create ...
2
votes
2answers
370 views

Is it dangerous to publish the enode address?

Someone mailed me and asked about my supernode ip / enode address. From go ethereum gitter: Hello all. I'm running a little over 100MH/s doing solo mining. Atm, we have a very high uncle rate, ...
27
votes
1answer
8k views

Cannot perform write functions in smart contract - invalid address?

I have the following simple smart contract... contract SimpleStorage { uint storedData; function set(uint x) { storedData = x; } function get() constant returns (uint retVal) ...
40
votes
2answers
29k views

Is Ethereum wallet address case sensitive?

I sent some amount of ETH to a wallet. I checked the wallets balance on ether chain. I entered the address in the search field and noticed both lowercase and uppercase versions of the address seemed ...
2
votes
1answer
429 views

Pass an array along when a contract creates a new contract

Can an array be passed along as a contract creates a new contract ? Specifically, an array of addresses. address[] verifiedUsers; new generatePOItokens(verifiedUsers);
8
votes
2answers
2k views

Some characters in Ether addresses have changed to capitals after upgrading Mist

I recently upgraded Mist from 0.3.9 to 0.5.0. I have noticed that the capitalisation of some of the characters in my public address have changed. Is this normal?
2
votes
1answer
2k views

Why does the transaction exceed block gas limit? [closed]

When I try sending ether to another account, I keep getting the message "Exceeds block gas limit". I changed the gas amount from 5,000 to 100,000 but nothing else happened. Why does the transaction ...
6
votes
3answers
3k views

Why does mist throw 'Uncaught invalid address'?

I'm trying to make a web page that gets a message from a simple "hello world" smart contract. Unfortunately, it isn't working. I'm seeing this in the Mist console. Uncaught invalid address v ...
2
votes
4answers
344 views

How to find out the ethereum addresses of services like Digix, Augur, etc.?

Is there any way to easily find the Ethereum addresses of Digix, Augur and similar Ethereum based enities? Or do I have to manually contact them?
8
votes
3answers
1k views

What is the Global Registrar?

Some guy on reddit found an address with 235 ETH in his wallet. He was confused about how he managed to get so much ETH. Commentators told him that it is the global registrar object. Here is an ...
4
votes
2answers
265 views

What's an “indirect ICAP address”?

The ethereum wiki has a specification of basic, direct and indirect ICAP addresses. Where the basic and the direct are well explained here and here, I have trouble to understand how indirect ICAP ...
3
votes
1answer
169 views

How strong are the checksums in Ethereum addresses?

2 options for Ethereum addresses which have checksums are ICAP and EIP55. Are there others? For each option, how strong are the checksums? What is the chance that a typing mistake (or mistakes) ...
2
votes
1answer
206 views

What is a “basic ICAP address”?

This answer mentions a "basic ICAP address". What is a basic ICAP address and what are its benefits and disadvantages over "regular" ICAP addresses?
3
votes
1answer
1k views

What is the purpose of multiple addresses in a wallet?

In eth-lightwallet from consensys there is a function generateNewAddress. What is the purpose of having multiple addresses for the same account? I can think of a few usages: accounting solution: 1 ...
6
votes
3answers
4k views

Is there any API for sending and receiving Ethers?

Is there any API for send and receive Ethers? If not, i am trying to use web3.js in my own server; What are the technical implications? Major security concerns? Can I use the same API for creating ...
5
votes
2answers
5k views

What is the difference between ICAP and HEX addresses?

I've read what Kraken have mentioned in the difference guide but I haven't understood it well. I plan to mine ethereum. What fits better for me?
60
votes
8answers
44k views

How can I check if an Ethereum address is valid?

I've read many times that you should never input an address by hand unless you want to accidentally send Ether into no-mans-land. I'd like to know what those checksums might be. Is there a way to tell ...
16
votes
4answers
5k views

How do Ethereum clients generate unique addresses?

How do Ethereum clients, like Ethereum Wallet or Eth-Lightwallet, generate unique addresses that haven't been used before, and what is the likelihood that these addresses have been used?
16
votes
2answers
5k views

Is it safe to reuse Ether addresses?

I believe it's viewed as unsafe in Bitcoin because of the way transactions are signed. Is this also true for Ether addresses?
3
votes
1answer
173 views

What options are suitable for Ethereum addresses with checksums?

Since Ethereum addresses don't have checksums, should ICAP addresses (which do have a checksum) be proliferated? Or are there other options more suitable for the proliferation of checksummed ...
14
votes
4answers
8k views

What Hierarchical Deterministic (HD) wallets are available for Ethereum?

A Hierarchical Deterministic (HD) wallet has some nice features such as easier backup (instead of needing to backup multiple keystore files and the passwords for each of them). Are there any ...
5
votes
1answer
168 views

How compatible are ICAP addresses with HD wallets?

A Hierarchical Deterministic (HD) wallet has some nice features such as easier backup (instead of needing to backup multiple keystore files and the passwords for each of them). Since ICAP addresses ...
3
votes
1answer
353 views

Is there a way to convert a regular address to an ICAP address?

The ethkey guide mentions how a regular address can be obtained from an ICAP address. But it doesn't mention how an ICAP address can be obtained from a regular address. Occasionally, however, it's ...
8
votes
1answer
3k views

What is an ICAP address?

It appears ethereum is using plain hexadecimal addresses like 0x0092e965928626f8880629cec353d3fd7ca5974f for now. I noticed, the ethereum C++ implementation outputs so called ICAP addresses, check ...
6
votes
1answer
1k views

Is there any lightweight JS library that generates Ethereum addresses from 256-bit private keys?

I have a 256-bit private key and I want to get its public address without having to install Geth (which is quite heavy) on the machine. Is there any small JS lib that does that?
11
votes
2answers
5k views

Are there other Vanity Address generators available?

Are there any Ethereum vanity address generators available other than: Vanityreum (python) Vanieth (go) Which is the fastest? Can they be optimized further? What is the use-case of vanity ...
8
votes
3answers
6k views

Convert an eth key to a geth key

I need to convert my eth key to a geth key. eth put the key in %appdata%\roaming\Web3\keys, and I see it as a .json file. If I move that to the %appdata%\roaming\Ethereum\keystore directory, geth ...
45
votes
3answers
69k views

How to backup mist wallets?

I know I can backup the keystore files from my running ethereum client which holds my accounts. But how can I backup wallets created with mist? Is it enough to write down the public address where the ...
11
votes
5answers
7k views

How to convert an address to bytes in Solidity?

What is the recommended way to convert an address to bytes in Solidity?
81
votes
5answers
25k views

How is the address of an Ethereum contract computed?

How is the address of an Ethereum contract computed? What use cases are there for knowing a contract's address in advance?
5
votes
2answers
734 views

Are addresses hashes of public keys, or are they compressed public keys?

I understand that in Bitcoin, addresses are hashed public keys. However, I've also heard that compressed public keys are just as short as hashes while maintaining their 1:1 relationship. Does ...
7
votes
3answers
3k views

Why are there no change addresses?

What's the concept behind ethereum transactions that allows them not to require change addresses? What's the underlying difference compared to - for example - bitcoin?

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