This is the CIP26 off-chain metadata registry for all publicly available testnets. If you intend to register any metadata for on-chain assets that exist on the cardano mainnet, please use the cardano-token-registry from CF.
This repository provides a means to register off-chain token metadata that can map to on-chain identifiers (typically hashes representing asset IDs, output locking scripts, or token forging policies).
A server exposes the functionality of a key-value store, allowing users and applications to query registry entries through a RESTful API.
While this registry is limited in scope to handle native tokens only, it will also serve to facilitate a discussion and introduce a standard for a metadata distribution system that is currently put forward as a draft CIP.
New submissions to this registry will take the form of a GitHub Pull Request with the addition of one JSON file to the registry/ folder. Submissions will be subject to automated checking for well-formedness and human vetting before being merged to the registry.
Modification of entries in this registry require a GitHub Pull Request with the modification of one JSON file in the registry/ folder. Submissions will be subject to automated checking for well-formedness and human vetting before being merged to the registry.
Each entry contains the following information:
| Name | Required/Optional | Description |
|---|---|---|
subject |
Required | The base16-encoded policyId + base16-encoded assetName |
name |
Required | A human-readable name for the subject, suitable for use in an interface |
description |
Required | A human-readable description for the subject, suitable for use in an interface |
policy |
Optional | The base16-encoded CBOR representation of the monetary policy script, used to verify ownership. Optional in the case of Plutus scripts as verification is handled elsewhere. |
ticker |
Optional | A human-readable ticker name for the subject, suitable for use in an interface |
url |
Optional | A HTTPS URL (web page relating to the token) |
logo |
Optional | A PNG image file as a byte string |
decimals |
Optional | how many decimals to the token |
The policy field is optional in order to support Plutus Smart-Contracts which are not linked to a set of signing keys by default. It is used in priority if present. Otherwise, signature verification is performed using user-provided trusted keys.
For a comprehensive description of all fields and how to generate them, please see offchain-metadata-tools.
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Submissions to the registry must consist of a single commit, directly off the master branch of the metadata-registry-testnet repository.
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Submissions must add or modify a singular file in the registry/ folder. Multiple mappings should be split across multiple PRs.
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The file name must match the encoded
"subject"key of the entry, all lowercase. -
The maximum file size of a single metadata entry is 370KB.
Users and applications can query this registry through an API at https://metadata.world.dev.cardano.org/metadata.
The API documentation and source code for the server implementation is available with the offchain-metadata-tools.
See Wiki.
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