# Ledger Live Support

Use the following instructions to interact with the Nyx blockchain (either with deployed smart contracts, or to send tokens) using your Ledger device to sign transactions.

## Prerequisites
* Download and install [Ledger Live](https://www.ledger.com/ledger-live).
* Compile the `nyxd` binary as per the instructions [here](../../operators/nodes/validator-setup). Stop after you can successfully run `nyxd` and get the helptext in your console output.

## Prepare your Ledger App
* Plug in your Ledger device
* Install the `Cosmos (ATOM)` app by following the instructions [here](https://hub.cosmos.network/main/resources/ledger.html). This app works with any Cosmos SDK chain, so you can manage your ATOM, OSMOSIS, NYM tokens, etc.
* On the device, navigate to the Cosmos app and open it

## Create a keypair
Add a reference to the ledger device on your local machine by running the following command in the same directory as your `nyxd` binary:

```
nyxd keys add ledger_account --ledger
```

## Command help with `nyxd`
More information about each command is available by consulting the help section (`--help`) at each layer of `nyxd`'s commands:

```
# logging top level command help
nyxd --help

# logging top level command help for transaction commands
nyxd tx --help

# logging top level command help for transaction commands utilising the 'bank' module
nyxd tx bank --help
```

## Sending tokens between addresses
Perform a transaction from the CLI with `nyxd`, appending the `--ledger` option to the command.

As an example, the below command will send 1 `NYM` from the ledger account to the `$DESTINATION_ACCOUNT`:

```
nyxd tx bank send ledger_account $DESTINATION_ACCOOUNT 1000000unym --ledger --node https://rpc.dev.nymte.ch:443
```

> When a command is run, the transaction will appear on the Ledger device and will require physical confirmation from the device before being signed.

## Nym-specific transactions
Nym-specific commands and queries, like bonding a Mix Node or delegating unvested tokens, are available in the `wasm` module, and follow the following pattern:

```
# Executing commands
nyxd tx wasm execute $CONTRACT_ADDRESS $JSON_MSG

# Querying the state of a smart contract
nyxd query wasm contract-state smart $CONTRACT_ADDRESS $JSON_MSG
```

You can find the value of `$CONTRACT_ADDRESS` in the [`network defaults`](https://github.com/nymtech/nym/blob/master/common/network-defaults/src/mainnet.rs) file.

The value of `$JSON_MSG` will be a blog of `json` formatted as defined for each command and query. You can find these definitions for the mixnet smart contract [here](https://github.com/nymtech/nym/blob/master/common/cosmwasm-smart-contracts/mixnet-contract/src/msg.rs) and for the vesting contract [here](https://github.com/nymtech/nym/blob/master/common/cosmwasm-smart-contracts/vesting-contract/src/messages.rs) under `ExecuteMsg` and `QueryMsg`.

### Example command execution:
#### Delegate to a Mix Node
You can delegate to a Mix Node from the CLI using `nyxd` and signing the transaction with your ledger by filling in the values of this example:
```
CONTRACT_ADDRESS=mixnet_contract_address

./nyxd tx wasm execute $CONTRACT_ADDRESS '{"delegate_to_mixnode":{"mix_identity":"MIX_NODE_IDENTITY","amount":{"amount":"100000000000","denom":"unym"}}}' --ledger --from admin --node https://rpc.dev.nymte.ch:443 --gas-prices 0.025unymt --gas auto -b block
```

> By replacing the value of `CONTRACT_ADDRESS` with the address of the vesting contract, you could use the above command to use tokens held in the vesting contract.

#### Query a vesting schedule
You can query for (e.g.) seeing the current vesting period of an address by filling in the values of the following:
```
CONTRACT_ADDRESS=vesting_contract_address

nyxd query wasm contract-state smart $CONTRACT_ADDRESS '{"get_current_vesting_period"}:{"address": "address_to_query_for"}' --ledger --from admin --node https://rpc.dev.nymte.ch:443 --chain-id qa-net --gas-prices 0.025unymt --gas auto -b block
```