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