ERC820 Pseudo-introspection Registry Contract

Universal registry smart contract where any address (contract or regular account) can register which interface it supports and which smart contract is responsible for its implementation.

Proposal

The official proposal can be found at: eips.ethereum.org/EIPS/eip-820.

ERC820 Registry

This repository contains the official implementation of the ERC820 registry as defined in the standard.

The address of the registry on all chains is:

0x820Afdf355177C099f0251e96A8e8B2974307381

ERC820 Implementer

The ERC820 implementer interface is the interface any contract MUST implement if said contract implements an interface on behalf of another address via ERC820.

Compilation & Verification

The registry can be compiled from the source code using:

npm run build

This will write the json artifacts for the registry in the artifacts folder and the standard output in the build folder.

Verification

The address of the account creating the registry, the address of the registry and the raw signed transaction can be generated with:

npm run info

> erc820@0.0.21 info /Users/kodikodytis/code/eip820
> node js/info.js

RawTx:  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
Sender:  0xC3AdeE9B2E23837DF6259A984Af7a437dE4E2ab6
Contract: 0x820d0Bc4d0AD9E0E7dc19BD8cF9C566FC86054ce

Those values can be compared with the values in the ERC820 standard.

Metadata

The metadata---for the registry only---can be extrated using:

node scripts/extract_metadata.js

This metadata can also be compared with the formated version in the ERC820 standard.

Vanity address

The vanity address of the registry---starting with 0x820---has been generated using the scripts/vanitygen.sh and scripts/vanitygen-info.js scripts.

Authors

• Jordi Baylina @jbaylina
• Jacques Dafflon @jacquesd

License

The ERC820 registry is part of the ERC820 standard and is therefore in the public domain via CC0.

The authors waive all copyright and related or neighboring rights for the rest of this repository's content via CC0. A copy of the CC0 waiver is included in the LICENSE file.