How can I convert a Substrate address to an Etherum address?
There is an EVM to substrate address conversion that Edgeware provides: https://edgewa.re/keygen
- 2Please provide more context and explain the question in more detail: Which address formats? Do you want to do it in code or just in general?. Also, it's best not to repeat the title of the question in the question body.Dcompoze– Dcompoze2022-04-09 19:47:02 +00:00Commented Apr 9, 2022 at 19:47
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1 Answer
The Ethereum address correspond to the last 20 bytes of the keccak-256 hash of the (decompressed) secp256k1 public key.
For example, given the following key generated via subkey tool:
❯ subkey generate --scheme Ecdsa Secret phrase `normal whale earth envelope wash bench drip latin please inform crisp congress` is account: Secret seed: 0x6c51a7f71537a60e666288a292ceabf322202af75e39bc34fd10f576cee489a5 Public key (hex): 0x025f13d211338f64fcc941e80b9d71929c38a7147762541da4123de45cedb0b312 Account ID: 0x211e23eda1f535feb3abd690513a0c2731c4bb9940aad59f0fb3c8abe89308e1 SS58 Address: 5Cp8PdGYPGe2Vc5WLb4eUmbeuhxuDjPSQcpyWgVSjh97D9sR Public key is given in compressed form:
Compressed: 0x025f13d211338f64fcc941e80b9d71929c38a7147762541da4123de45cedb0b312 Decompress it
Decompressed: 0x045f13d211338f64fcc941e80b9d71929c38a7147762541da4123de45cedb0b31290c16565dbc3c937fd1d9cf4ecc8ad489551a7d608ec5c649bec747183334754 Compute the Keccak-256 of the decompressed key (excluded the first byte (0x04))
Keccak-256: 0x09ed410a80b44d0a8c3e7e1fd924abdb51e253b19f69fd8114fe6d9a1794d2cf The last 20 bytes is the Ethereum address
Eth Address: 0xd924abdb51e253b19f69fd8114fe6d9a1794d2cf Said that, if instead you only have a Substrate AccountId (without the public key) it is not possible to convert it to the corresponding ETH address.
The reason is that the AccountId is the result of a hash applied to the PublicKey (+ some other data) and thus it is not possible to revert it in order to recover the public key (and apply the procedure I've described above).
Here is a code snip doing the conversion in the Substrate Beefy pallet:
- What does it mean for a key to be compressed/decompressed?Purple_Turtle– Purple_Turtle2022-11-17 05:26:49 +00:00Commented Nov 17, 2022 at 5:26
- A public key is a point in a curve. In order to recover the point is sufficient to have only one between x and y (typically x is chosen) and the sign of the other.Davide Galassi– Davide Galassi2022-11-18 09:06:53 +00:00Commented Nov 18, 2022 at 9:06
- But what does it have to do with compression?Purple_Turtle– Purple_Turtle2022-11-18 13:05:01 +00:00Commented Nov 18, 2022 at 13:05
- Since you are actually representing the same information with half of the data this is in fact a compression. It is called "point compression" in the SEC1 standard. Please refer to paragraph 2.3.3 of secg.org/sec1-v2.pdfDavide Galassi– Davide Galassi2022-11-19 09:54:00 +00:00Commented Nov 19, 2022 at 9:54