Why does my BTC address start with a 3?

Bitcoin has a few different types of addresses. These types relate to what is necessary to spend the coins associated with the address.  Addresses starting with "1" are commonly known as Legacy addresses. Addresses that start with "3", known as P2SH addresses are multi-purpose addresses, and your Trezor uses them for SegWit transactions.

SegWit is an improvement over the current bitcoin blockchain which reduces the size needed to store transactions in a block. It gives three main benefits: lower transaction fees, faster transactions, and added security.

Exodus supports all types of Bitcoin addresses:

  • Legacy (P2PKH) starting with 1
  • P2SH starting with 3
  • Native SegWit (bech32) starting with bc1

While native SegWit addresses are the newest and allow spending with the lowest fees among other things, not all wallets or services understand them. Trezor uses type "3" SegWit addresses because not all wallets can understand how to send to bech32 addresses. Some old wallets and services haven't been updated to support sending to "bc1" addresses, but they do know how to send to ones that start with the "3".

You can read more about Trezor SegWit support here: 
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