This directory hosts JSON definitions of recognized coins, tokens, and FIDO/U2F apps.
The fido/ subdirectory contains definitons of apps whose logos and
names are shown on Trezor T screen for FIDO/U2F authentication.
Each app must have a single JSON file in the fido/ subdirectory. Every app must have
its label set to the user-recognizable application name. The u2f field is a list of
U2F origin hashes, and the webauthn field is a list of FIDO2/WebAuthn hostnames for
the app. At least one must be present.
Each app can have an icon. If present, it must be a 128x128 pixels RGBA PNG of the same
name as the corresponding JSON name. If the app does not have an icon, it must instead
have a field no_icon set to true in the JSON.
We currently recognize five categories of coins.
The bitcoin/ subdirectory contains definitions for Bitcoin and altcoins
based on Bitcoin code.
Each Bitcoin-like coin must have a single JSON file in the bitcoin/ subdirectory,
and a corresponding PNG image with the same name. The PNG must be 96x96 pixels and
the picture must be a circle suitable for displaying on Trezor T.
Testnet is considered a separate coin, so it must have its own JSON and icon.
We will not support coins that have address_type 0, i.e., same as Bitcoin.
Definitions for Ethereum chains (networks) and tokens (erc20) are split in two parts:
- built-in definitions - some of the chain and token definitions are built into the firmware
image. List of built-in chains is stored in
ethereum/networks.jsonand tokens inethereum/tokens.json. - external definitions - dynamically generated from multiple sources. Whole process is described in separate document.
We generally do not accept updates to the built-in definitions. Instead, make sure your
network or token is included in the external definitions. A good place to start is the
ethereum-lists GitHub organization: add your token
to the tokens repository, or your EVM chain to the
chains repository.
The file nem/nem_mosaics.json describes NEM mosaics.
Supported coins that are not derived from Bitcoin, Ethereum or NEM are currently grouped
and listed in separate file misc/misc.json. Each coin must also have
an icon in misc/<short>.png, where short is lowercased shortcut field from the JSON.
Throughout the system, coins are identified by a key - a colon-separated string generated from the coin's type and shortcut:
- for Bitcoin-likes, key is
bitcoin:<shortcut> - for Ethereum networks, key is
eth:<shortcut>:<chain_id> - for ERC20 tokens, key is
erc20:<chain_symbol>:<token_shortcut> - for NEM mosaic, key is
nem:<shortcut> - for others, key is
misc:<shortcut>
If a token shortcut has a suffix, such as CAT (BlockCat), the whole thing is part
of the key (so the key is erc20:eth:CAT (BlockCat)).
Duplicate keys are not allowed and coins that would result in duplicate keys cannot be added to the dataset.
We keep track of support status of each built-in coin over our devices. That is T1B1
for Trezor One, T2T1 for Trezor T, T2B1 and T3B1 for Trezor Safe 3 (both models
should have identical entries, except for minimum versions which are higher on T3B1),
T3T1 for Trezor Safe 5.
This information is stored in support.json.
External contributors should not touch this file unless asked to.
Each coin on each device can be in one of four support states:
- supported explicitly: coin's key is listed in the device's
supporteddictionary. If it's a Trezor device, it contains the firmware version from which it is supported. For connect and suite, the value is simplytrue. - unsupported explicitly: coin's key is listed in the device's
unsupporteddictionary. The value is a string with reason for not supporting. For connect and suite, if the key is not listed at all, it is also considered unsupported. ERC20 tokens detected as duplicates are also considered unsupported. - unknown: coin's key is not listed at all.
Supported coins are used in code generation (i.e., included in built firmware). Unsupported and unknown coins are excluded from code generation.
You can edit support.json manually, but it is usually better to use the support.py tool.
See tools docs for details.