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.
The official proposal can be found at: eips.ethereum.org/EIPS/eip-820.
This repository contains the official implementation of the ERC820 registry as defined in the standard.
The address of the registry is 0xa691627805d5FAE718381ED95E04d00E20a1fea6
on all chains.