> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dfns.co/llms.txt
> Use this file to discover all available pages before exploring further.

# Cosmos

> Reference for the Cosmos signing endpoint, including supported signature kinds, request payloads, and the fields required to sign Cosmos SDK transactions.

Cosmos Appchains like Osmosis and Sei support the following signature `kinds`:

* `SignDocDirect`, serialized sign doc for [sign mode direct](https://docs.cosmos.network/sdk/v0.53/learn/advanced/transactions#sign_mode_direct-preferred).

## SignDocDirect

Signs an unsigned transaction using `SIGN_MODE_DIRECT`.

| Field            | Description                                        | Type - Optional |
| ---------------- | -------------------------------------------------- | --------------- |
| `blockchainKind` | `Cosmos`                                           | String          |
| `kind`           | `SignDocDirect`                                    | String          |
| `signDoc`        | The hex encoded `SignDoc` Protobuf as shown below. | String          |

```json theme={null}
{
  "blockchainKind": "Cosmos",
  "kind": "SignDocDirect",
  "signDoc": "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"
}
```

### Typescript Example with CosmJS SDK

First install the CosmJS SDK. You can find the full documentation here: [https://cosmos.github.io/cosmjs/](https://cosmos.github.io/cosmjs/)

Here a code sample to generate a signature via [the Dfns TypeScript SDK](https://github.com/dfns/dfns-sdk-ts):

```typescript theme={null}
const client = await Comet38Client.create(new HttpClient(process.env.OSMOSIS_NODE_URL!))
const queryClient = QueryClient.withExtensions(cometClient, setupAuthExtension)

const body: TxBodyEncodeObject = {
  typeUrl: '/cosmos.tx.v1beta1.TxBody',
  value: {
    messages: [
      {
        typeUrl: '/cosmos.bank.v1beta1.MsgSend',
        value: {
          fromAddress: address,
          toAddress: to,
          amount: coins(1, 'uosmo'),
        },
      },
    ],
    memo,
  },
}

const account = await context.queryClient.auth.account(address)
const { sequence, accountNumber } = accountFromAny(account)

const authInfoBytes = makeAuthInfoBytes(
  [
    {
      pubkey: encodePubkey(encodeSecp256k1Pubkey(Buffer.from(publicKey, 'hex'))),
      sequence,
    },
  ],
  '100',
  Int53.fromString(fee.gas).toNumber(),
  undefined,
  undefined
)

const signDoc = makeSignDoc(context.registry.encode(body), authInfoBytes, 'osmo-test-5', accountNumber)

const res = await dfnsClient.wallets.generateSignature({
  walletId,
  body: {
    kind: 'SignDocDirect',
    signDoc: `0x${Buffer.from(makeSignBytes(doc)).toString('hex')}`,
  },
})
```