Questions tagged [addresses]

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

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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?
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79 votes
9 answers
85k 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 ...
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4 answers
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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?
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21 votes
2 answers
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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?
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3 votes
1 answer
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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 ...
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14 votes
4 answers
9k 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 ...
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1 answer
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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 ...
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3 votes
1 answer
412 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 ...
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8 votes
1 answer
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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 ...
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6 votes
1 answer
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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?
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15 votes
3 answers
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Ethereum Vanity Address generators

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 ...
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9 votes
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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 ...
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44 votes
3 answers
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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 ...
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17 votes
6 answers
17k views

How to convert an address to bytes in Solidity?

What is the recommended way to convert an address to bytes in Solidity?
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115 votes
6 answers
54k 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?
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5 votes
2 answers
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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 ...
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8 votes
3 answers
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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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7 votes
1 answer
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JavaScript Code Required to Generate an Ethereum Address?

I am aware of several tools and websites that generate addresses for you, but I'm looking for an actual JavaScript code snippet to demonstrate the steps plainly.
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Should I always put 0x at the start of Ethereum addresses?

Should I always put 0x at the start of Ethereum addresses? Sending ether to addresses without 0x seem to work perfectly fine. when sending to an address, do you include the "0x" before the rest of ...
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8 votes
1 answer
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What is the 0x I see around Ethereum? For example I see addresses that start with 0x

I see a number of things in Ethereum start with 0x, for example addresses. Other examples are in the Geth console, JSON-RPC, web3.js. What is the 0x and what is its purpose?
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5 votes
2 answers
626 views

Which Ethereum clients/wallets support the ICAP?

The ICAP is a method of representing an Ethereum address with a built-in checksum and in a way that is compliant with most bank software due to compliance with the International Bank Account Number (...
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55 votes
4 answers
17k views

Why don't Ethereum addresses have checksums?

A checksum, similar to its use in Bitcoin addresses, can primarily prevent mistyped or invalid addresses from being used, before a transaction with an invalid address is constructed. Why don't ...
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