DIP-2 (#9)

DIPs/dip-2.md

@@ -0,0 +1,50 @@
+---
+dip: 2
+title: Seamless Account Integration Between EVM and Substrate
+description: This proposal introduces the adoption of `H160` account addresses in Substrate-based chains to unify address formats with EVM, which aims to simplify user interactions and enhance compatibility with the Ethereum ecosystem.
+authors: Darwinia Network (@AurevoirXavier, @boundless-forest, @hackfisher)
+status: Final
+type: Core
+created: 2023-12-13
+---
+
+
+## Abstract
+To facilitate Ethereum integration, Substrate-based chains are transitioning to `H160` account addresses, using `ECDSA` for signatures.
+This change streamlines the user experience by consolidating address types and wallets.
+
+
+## Rationale
+Ethereum-like and Substrate-based chains differ significantly in their account format.
+
+Ethereum uses `H160` for its account addresses, while Substrate opts for `H256`.
+
+With the EVM being a superior feature, more Substrate-based chains are incorporating it into their systems to tap into Ethereum's ecosystem
+Darwinia is doing the same.
+
+However, this creates an issue where users and developers must juggle two distinct address types and wallets.
+
+To avoid this disconnect, we've decided to adopt `H160` as the native account address type for Substrate.
+
+With this improvement, users only need to interact with one type of account and wallet.
+
+
+## Specification
+Utilize `ECDSA` as the signature algorithm for Substrate native runtime.
+
+```rs
+/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
+pub type Signature = fp_account::EthereumSignature;
+
+/// Some way of identifying an account on the chain.
+/// We intentionally make it equivalent to the public key of our transaction signing scheme.
+pub type AccountId = <<Signature as sp_runtime::traits::Verify>::Signer as sp_runtime::traits::IdentifyAccount>::AccountId;
+```
+
+The address is 20 bytes long, and the public key no longer has a corresponding SS58 address.
+
+All pallet addresses have been truncated to 20 bytes; simply remove the trailing zeros, which are 12 bytes long.
+
+
+## Copyright
+Copyright and related rights waived via [CC0](../LICENSE).