What does a Bitcoin address begin with?

Bitcoin addresses begin with specific prefixes that denote the type of address and the corresponding blockchain network.

Sep 27, 2024 at 05:06 pm

What Does a Bitcoin Address Begin With?

1. Identification: A Bitcoin address serves as a unique identifier for a Bitcoin account, similar to a bank account number. It allows individuals to send and receive Bitcoin securely.
2. Format: A valid Bitcoin address comprises a string of numbers and letters that typically starts with a particular prefix. This prefix denotes the type of address and the corresponding blockchain network.

3. Mainnet Addresses:

   • Native SegWit (Bech32): Begins with "bc1q," "bc1p," or "bc1r."
   • Non-Native SegWit (P2SH-SegWit): Begins with "3."

4. Testnet Addresses:

   • Native SegWit (Bech32): Begins with "tb1q," "tb1p," or "tb1r."
   • Non-Native SegWit (P2SH-SegWit): Begins with "m" or "2."

5. Legacy Addresses (P2PKH):

   • Begins with "1."

6. Multisignature Addresses:

   • m of n Support: Begins with "2," followed by a number to indicate the required number of signatures (e.g., "23" for a 3-of-3 multisignature address).

7. Unique Characteristics:

   • Bitcoin addresses are case-sensitive.
   • They can contain a combination of uppercase and lowercase letters, as well as numbers.
   • They are typically between 26 and 35 characters long.

8. Security:

   • Bitcoin addresses are considered reliable since they are generated cryptographically using public-key cryptography.
   • Keeping private keys (which correspond to Bitcoin addresses) secure is crucial for maintaining funds.