> For the complete documentation index, see [llms.txt](https://zenofchain.gitbook.io/sway-bian-cheng-yu-yan-geng-xin-zhong-the-sway-programming-languageupdatin/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://zenofchain.gitbook.io/sway-bian-cheng-yu-yan-geng-xin-zhong-the-sway-programming-languageupdatin/5.-yong-sway-bu-shu-qu-kuai-lian-blockchain-development-with-sway/5.4-biao-shi-fu-identifiers.md).

# 5.4 标识符(Identifiers)

Addresses in Sway are similar to EVM addresses. The two major differences are:

Sway中的地址与EVM的地址相似。两个主要区别是：

1. Sway addresses are 32 bytes long (instead of 20)\
   Sway中的地址长度是32字节(而不是20字节)
2. Sway addresses are computed with the SHA-256 hash of the public key instead of the keccak-256 hash.\
   Sway地址是用公钥的SHA-256哈希值而不是keccak-256哈希值计算的。

Contracts, on the other hand, are uniquely identified with a contract ID rather than an address. A contract's ID is also 32 bytes long and is calculated [here](https://fuellabs.github.io/fuel-specs/master/protocol/id/contract).

另一方面，合约是用一个合约 ID 而不是地址来唯一识别的。一个合约的 ID 也是32个字节长，并在[这里](https://fuellabs.github.io/fuel-specs/master/protocol/id/contract)计算。