ERC1319: Package Registry Standard
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An ethPM registry is an on-chain datastore for package releases. For each package release, three pieces of information are committed to storage:
a package name
a package version
the content-addressed URI associated with the package's manifest.
was written to define the API for an on-chain ethPM registry. It is the minimum feasible API for a registry to interoperate with various ethPM tooling. It is encouraged for people to build their own registry implementations that extend upon the standard to support any kind of specialized behavior.
There are a couple different implementations of ERC1319 available.
Solidity implementation with release deletion (but prevents re-releasing the same package version)
Solidity implementation without release deletion
Vyper (experimental)
ethPM-CLI provides deploy the Simple Registry to any blockchain.
Escape-Truffle provides to assist with deploying its series of smart contracts.
As of ethPM V3, the name and version field of a manifest are no longer strictly required. Best practice is that every package should define these in their manifest. Some tooling may even go as far as requiring these fields are defined before cutting a release. When a package is released on a registry, users must provide an official name and version under which to identify a release on the blockchain. The following table defines how a package should be identified, considering the various cases when manifest defines / omits the name and version, and whether or not the manifest is stored on an on-chain registry.
Manifest contains name and version
Manifest omits name and version
Sourced from registry
Manifest name, version must match registry name, version
Registry name, version is valid identifier
Not sourced from registry
Manifest name, version is the valid identifier
Ambiguous, user must define name, version