# Editing config.toml file

### Editing config.toml file

In order to enable a new chain, a DSP must add the following to the `config.toml` environment variable file. This is the file that holds the environment variables for your DSP’s API instance. Each sidechain will need a new `[sidechains.CHAIN_NAME]` section. `CHAIN_NAME` - this is the account on the EOS mainnet that has registered with the [`liquidx.dsp`](https://bloks.io/account/liquidx.dsp) contract as the chain’s name. This name can be found from the block producers of the chain, other DSPs, or the community.

```
# sidechain section, if no sidechains, leave as [sidechains], can add additional sidechains with [sidechains.newchain] ...
[sidechains]
  [sidechains.test1]
    # dsp
    dsp_port = 3116 # dsp port to run new chain's services on, this is the port developers will push to, must be unique per new chain
    dsp_account = "test1" # DSP Account on new chain
    dsp_private_key = "" # DSP active private key on new chain
    # nodeos
    nodeos_host = "localhost" # nodeos host running new chain
    nodeos_port = 8888 # nodeos host port
    nodeos_secured = false # nodeos secured bool (true: https, false: http)
    nodeos_chainid = "" # chainid of new chain
    nodeos_websocket_port = 8887 # nodeos websocket port, can be same per nodeos instance
    nodoes_latest = true # if using 2.0+ version of nodeos, true, if less than 2.0, false
    webhook_dapp_port = 8113 # nodeos webhook port, must be unique per chain
    # demux
    demux_webhook_port = 3196 # port demux runs on, must be unique per new chain
    demux_socket_mode = "sub"
    demux_head_block = 1 # head block to sync demux from
    # demux defaults to first pulling head block from toml file if postgres database is not set
    # after database is set, defaults to database, to overwrite and default to toml file, pass true
    demux_bypass_database_head_block = false
    demux_max_pending_messages = 500 # amount of pending messages to add to the stack before disconnecting the demux websocket to allow pending messages to process
    # sidechain 
    liquidx_contract = "liquidx.dsp" # liquidx contract on the EOS mainnet
    name = "test1" # CHAIN_NAME - contract on the EOS mainnet that registered the new chain
    # the mapping below contains the dappservices:dappservicex and mainnet DSP account to the new chain's DSP account mapping
    mapping = "dappservices:dappservicex,uuddlrlrbass:uuddlrlrbass"
  # [sidechains.ANOTHER_CHAIN_NAME]
    # ...
```

Once this has been configured, the environment variables for the DSP can be updated with:

```
systemctl stop dsp
cd $(readlink -f `which setup-dsp` | xargs dirname)
setup-dsp
systemctl start dsp
```

You can also upgrade to the latest version of the DSP software by reinstalling the DSP, be sure to backup any logs you wish to preserve first.