ethers-rs/ethers-core/README.md

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# Ethereum types, cryptography and utilities.
It is recommended to use the `utils`, `types` and `abi` re-exports instead of
the `core` module to simplify your imports.\_
This library provides type definitions for Ethereum's main datatypes along with
other utilities for interacting with the Ethereum ecosystem
## Signing an ethereum-prefixed message
Signing in Ethereum is done by first prefixing the message with
`"\x19Ethereum Signed Message:\n" + message.length`, and then signing the hash
of the result.
```rust,ignore
# async fn foo() -> Result<(), Box<dyn std::error::Error>> {
use ethers::signers::{Signer, LocalWallet};
let message = "Some data";
let wallet = LocalWallet::new(&mut rand::thread_rng());
// Sign the message
let signature = wallet.sign_message(message).await?;
// Recover the signer from the message
let recovered = signature.recover(message)?;
assert_eq!(recovered, wallet.address());
# Ok(())
# }
```
## Utilities
The crate provides utilities for launching local Ethereum testnets by using
`ganache-cli` via the `GanacheBuilder` struct.
# Features
- - ["eip712"] | Provides Eip712 trait for EIP-712 encoding of typed data for
derived structs
# ABI Encoding and Decoding
This crate re-exports the [`ethabi`](https://docs.rs/ethabi) crate's functions
under the `abi` module, as well as the
[`secp256k1`](https://docs.rs/libsecp256k1) and [`rand`](https://docs.rs/rand)
crates for convenience.