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SIP-27: Accounts Metadata Request #148

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SIP-27: Accounts Metadata Request #148

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SIP-27: Accounts Metadata Request
ritave Sep 18, 2024
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Update SIP-27 with unsaved changes
ritave Sep 18, 2024
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Changed after code review
ritave Sep 20, 2024
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extension -> client
ritave Sep 20, 2024
18dff37
Use CAIP-2 chains and namespaces
ritave Sep 30, 2024
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70 changes: 70 additions & 0 deletions SIPS/sip-27.md
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---
sip: 27
title: Accounts Metadata Request
status: Draft
author: Olaf Tomalka (@ritave)
created: 2024-09-17
---

## Abstract

This SIP allows Snaps to retrieve metadata related to accounts that exist in the extension.

## Motivation

The intention of this SIP is to allow Snaps providing new accounts for new chains to be able to list all accounts when selecting one during transfers. Currently the Snap can only access their own accounts, and can't do more complex UI flows.

The specific need for this SIP is to allow a Snap to create a send flow with an account picker, with an example design as follows.

<img src="../assets/sip-27/snap-account-list.png" alt="Account picker flow" width="600"/>

## Specification

> Indented sections like this are considered non-normative.

> Usage of `CAIP-N` specifications, where `N` is a number, are references to [Chain Agnostic Improvement Proposals](https://github.com/ChainAgnostic/CAIPs).

### Language

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" written in uppercase in this document are to be interpreted as described in [RFC 2119](https://www.ietf.org/rfc/rfc2119.txt)

### Snap Manifest

This SIP specifies a permission named `keyring_listAccountsAll`. This permission grants a Snap the ability to retrieve account metadata through an RPC call.

The permission is specified in `snap.manifest.json` as follows:

```json
{
"initialPermissions": {
"keyring_listAccountsAll": {}
}
}
```

### RPC Method

This SIP exposes a new RPC method called `keyring_listAccountsAll` with no additional parameters.

The RPC call returns with the following data:

```typescript
type KeyringAccount = {
id: string; // An extension-specific unique ID
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Does it make sense to expose this? What do you envision we use it for?

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When you have two accounts with the same address (eg 2 different hardware wallets with the same seed), you need to differentiate them somehow.

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I feel like this just complicates things. The Snap has no information about how the address was created, right? Is it even relevant for the Snap?

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This provides a stable identity for an account.

For example, you could want to map accounts to a user editable notes about those accounts.

You can't use the name since it's user editable and can change, and you can't use address because there are multiple accounts with the same address.

By providing a stable identity (similar to React's key property) you can easily manipulate those accounts.

address: string; // A blockchain specific public address for the account.
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Should this be a CAIP-10 address?

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This address can exist on multiple chains at the same time. Keyrings initially had a chains property, but it's not implemented

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Then how would you identify which network the address is tied to? 🤔

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The only data available in MetaMask currently is the type property.

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I guess my question is, should we combine type and address into one field with a CAIP-10 address.

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@ritave ritave Sep 20, 2024 •
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type exposes more information than just the network the address is on.

Accounts team envisioned the following types:

type AccountType =
	| 'eip155:eoa'
	| 'eip155:sca:erc4337'
	| 'bip122:p2pk'
	| 'bip122:p2pkh'
	| 'bip122:p2sh'
	| 'bip122:p2wpkh'
	| 'bip122:p2tr';

Notice they are all on mainnet while still differing

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The main goal of type is to differentiate between accounts that may behave differently, such as EOAs and Smart Contract Accounts.

For multichain, we are still working on a solution that addresses two key issues:

  • Storing past Bitcoin addresses
  • Supporting multiple addresses for multiple chains (e.g., Cosmos)

We are considering approaches like addresses: Map<Caip2ChainId, Address[]> or addresses: Caip10Address[] (PR draft). Which is aligned with what you said above.

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@ritave, I need to double-check, but the reason we dropped the chains field was that CAIP-2 doesn't support wildcards. We considered using eip155:*, even though it wouldn’t be compliant, but ultimately decided to replace it with a filterAccountChains method. This method can be called with a list of CAIP-2 chain IDs, and the Snap will return the list of supported chains from the input where the account can be used.

I'm not super happy with the decision and think we can reconsided the chains field.

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IIRC, we were also considering using just the CAIP namespace as an alternative to wildcard. This way we can regroup "things" on the same namespace, so instead of eip155:*, we would use eip155.

We started using this pattern in the extension/core IIRC. But this is still not 100% compliant with a true CAIP-2 identifier...

name: string; // User-given nickname for the account in the extension
type: string; // Blockchain specific type of the account. For example "eip155:erc4337"
};
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If we wish to have a similar UI than the native one to list the accounts, we might needs some more information coming from the metadata field from InternalAccount (maybe not everything, but I was thinking about hardware-wallet accounts).

In case of HW, the account.type will be eip155:eoa, but we don't encode any other information regarding which HW if comes from. We do have this information in the account.metadata.keyring.type field like:

{
  "id": "651e5769-86b1-4717-ae7b-63a00d7b3872",
  "address": "0x9f753769a4b45e8e2ed61108f1174b5a0939e08e",
  "options": {},
  "methods": [
    ...
  ],
  "type": "eip155:eoa",
  "metadata": {
    "name": "Ledger 1",
    "importTime": 1727081928281,
    "keyring": {
      "type": "Ledger Hardware"
    },
    "lastSelected": 1727081928285,
    "nameLastUpdatedAt": 1727081928286
  }
}

And I believe, if we implement a similar AccountList component to display the list of accounts, we will need this keyring.type information to be able to display the small pill Ledger alongside the account entry.

Screenshot 2024-09-23 at 11 16 55

But I think @danroc had a different ideas regarding rendering a AccountList component, so maybe we won't even need to expose any of those metadata :).

I just wanted to be explicit here that type lacks some context/information.


type Keyring_ListAccountsAllResult = KeyringAccount[];
```

> Notice that multiple `Account`s can have the same `address`, for example when there are two hardware wallets using the same seed.

The call returns data concerning all accounts available in the client, both built-in Ethereum accounts as well as accounts managed by this, and other Snaps.

## Copyright

Copyright and related rights waived via [CC0](../LICENSE).
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