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Bitcoin addresses are keys of alphanumeric characters, starting with 1 or 3, which represent destinations for bitcoin payments. Addresses are generated by bitcoin users, on a bitcoin website or using an account at an exchange or online wallet service. Most addresses are 34 characters but can be as few as 26 and still be valid. Every Bitcoin address stands for a number and the shorter addresses are valid because they stand for numbers that start with zeroes — when the zeroes are omitted, the encoded address gets shorter.
Several bitcoin address characters are used as a checksum so typographical errors can be automatically found and rejected. The checksum also allows bitcoin software to confirm that a character or shorter address is valid.
Like an email, you send bitcoins to a person using their address, but unlike an email, people can have many different addresses, with a different one for each transaction, and bitcoin software and websites will generate a new address for each invoice or payment request. Many addresses may be created at once using free software, and can be useful for ecommerce websites.
Bitcoin addresses are case-sensitive and an incorrect address can mean the transaction will be rejected by bitcoin software. Some services also offer this feature with a specific address only for authentication, meaning the address will never be used for bitcoin transactions, and a signature will be needed to prove you are the person with that address. However, these signatures only prove receipt with an address. Moreover, this authentication feature is only compatible with bitcoin address that begin with 1.
To validate a Bitcoin address, you can follow the instructions in this thread, making sure you have the correct character length, allowed characters, and that the address starts with a 1 or 3. Validation may also be done using open source code available in various languages or with an online validation tool. Addresses can be created that require a combination of multiple private keys, rather than just one, but these addresses only begin with 3.
The requirements to send are decided in advance by the person generating the address, and once an address is created, the requirements cannot be changed without generating a new address. Testnet is an alternative Bitcoin block chain used for testing. They allow developers or bitcoin testers to experiment without using real bitcoins or worrying about breaking the main bitcoin chain. Addresses on the Bitcoin Testnet are generated with a different address version, with modified prefixes.
See a list of address prefixes and Testnet for more details. They only receive funds, so if you have leftover bitcoin on an address, it is transferred to a change address that needs to be backed up, or else you will lose the balance.
Skip to content Tokens The two common address formats are: P2PKH starting with r 1, eg: P2SH starting with 3, eg: Address rules Most addresses are 34 characters but can be as few as 26 and still be valid.
Addresses are only used once Like an email, you send bitcoins to a person using their address, but unlike an email, people can have many different addresses, with a different one for each transaction, and bitcoin software and websites will generate a new address for each invoice or payment request.
Addresses require precision Bitcoin addresses are case-sensitive and an incorrect address can mean the transaction will be rejected by bitcoin software.
Addresses may be validated before use To validate a Bitcoin address, you can follow the instructions in this thread, making sure you have the correct character length, allowed characters, and that the address starts with a 1 or 3. Multi-signature addresses Addresses can be created that require a combination of multiple private keys, rather than just one, but these addresses only begin with 3.
Testing addresses on Testnet Testnet is an alternative Bitcoin block chain used for testing. First Name Email address: