Table of Contents

Introduction

Ethereum (ETH), Ethereum Classic (ETC) and ERC20 Tokens

• Install the Ethereum dependencies
• Install and run Geth or Parity
• Transacting and other basic operations
• Creating and deploying ERC20 tokens

Bitcoin Cash Node (BCH) and Litecoin (LTC)

Monero (XMR)

Key/address generation for Zcash (ZEC)

Key/address generation for 144 Bitcoin-derived altcoins

Introduction

Depending on your setup, the instructions on this page may apply to your offline machine, your online machine, or both. If you’re confused as to which, please familiarize yourself with the basics of MMGen Wallet by reading the Getting Started guide.

Ethereum (ETH), Ethereum Classic (ETC) and ERC20 Tokens

MMGen Wallet supports all operations for Ethereum, Ethereum Classic and ERC20 tokens. In addition, ERC20 token creation and deployment are supported via the create-token.py script.

Install the Ethereum dependencies

From the MMGen Wallet repository root, type:

$ python3 -m pip install -r alt-requirements.txt # skip this for MSYS2
$ python3 -m pip install --no-deps -r eth-requirements.txt

Install and run Geth or Parity

MMGen Wallet uses Go-Ethereum (Geth) to communicate with the Ethereum network. For information on installing Geth on your system, visit the the Geth Github repo. On Arch Linux systems, Go-Ethereum is a package and may be installed with pacman.

Note that the Ethereum daemon is not used for transaction signing, so you needn’t install it on your offline machine.

For Geth, the following command-line options are required:

--http --http.api=eth,web3,txpool --http.port=8745

Geth has dropped support for Ethereum Classic, however transacting ETC is still supported by the legacy Parity daemon. Invoke Parity with --chain=classic --jsonrpc-port=8645.

If you’re running Parity on a different machine from MMGen Wallet, add the following options to the command line:

--jsonrpc-hosts=all --jsonrpc-interface=<daemon IP address>

To run Parity offline, use --mode=offline, otherwise --mode=active.

Parity’s light client mode, which queries other nodes on the network for blockchain data, is supported. Add the --light option to the Parity command line and read the applicable note in the Transacting section below.

You may require other options as well. Invoke your daemon with the --help option for more complete information.

Transacting and other basic operations

Basic operations with ETH, ETC and ERC20 tokens work as described in the Getting Started guide, with some differences. Please note the following:

• Don’t forget to invoke all commands with --coin=eth or --coin=etc.
• Use the --token option with the token symbol as parameter for all token operations. When importing addresses for a new token into your tracking wallet, use the --token-addr option with the token address instead.
• Addresses and other hexadecimal values are given without the leading 0x.
• Fees are expressed in Gas price, e.g. 12G for 12 Gwei or 1000M for 1000 Mwei. This works at both the command line and interactive prompt.
• When using Parity in light client mode, the --cached-balances option will greatly speed up operations of the mmgen-txcreate, mmgen-txdo and mmgen-tool twview commands by reducing network queries to a minimum. If your account balances have changed, they may be refreshed interactively within the TRACKED ACCOUNTS menu. Cached balances are stored persistently in your tracking wallet.

Transacting example:

Note: All addresses and filenames in the examples to follow are bogus and must be replaced with real ones.

Generate some ETH addresses with your default wallet:

$ mmgen-addrgen --coin=eth 1-5

Create an EOS token tracking wallet and import the addresses into it:

$ mmgen-addrimport --coin=eth --token-addr=86fa049857e0209aa7d9e616f7eb3b3b78ecfdb0 ABCDABCD-ETH[1-5].addrs

Unlike the case with BTC and derivatives, ETH and ETC tracking wallets are created and managed by MMGen Wallet itself and located under the MMGen data directory. Token tracking wallets are located inside their underlying coin’s tracking-wallet.json file. Address (account) balances are retrieved directly from the blockchain. Tracking wallet views are separate for each token.

Now send 10+ EOS from an exchange or another wallet to address ABCDABCD:E:1. Then create a TX sending 10 EOS to third-party address aabbccdd..., with change to ABCDABCD:E:2:

$ mmgen-txcreate --coin=eth --token=eos aabbccddaabbccddaabbccddaabbccddaabbccdd,10 ABCDABCD:E:2

On your offline machine, sign the TX:

$ mmgen-txsign --coin=eth --token=eos ABC123-EOS[10,50000].rawtx

You can also set up and use autosigning on the offline machine.

On your online machine, send the TX:

$ mmgen-txsend --coin=eth --token=eos ABC123-EOS[10,50000].sigtx

View your EOS tracking wallet:

$ mmgen-tool --coin=eth --token=eos twview

To transact ETH instead of EOS, omit the --token and --token-addr arguments.

Creating and deploying ERC20 tokens

Install the Solidity compiler

To deploy Ethereum contracts with MMGen Wallet, you need version 0.8.26 or newer of the Solidity compiler (solc) installed on your system. Static binary builds are available from the Solidity Github repository. For other ways to install solc on your platform, refer to the Solidity documentation.

Create and deploy a token

Note: All addresses and filenames in the examples to follow are bogus. You must replace them with real ones.

Create a token 'MFT' with default parameters, owned by ddeeff... (ABCDABCD:E:1):

# Do this in the MMGen Wallet repository root:
$ scripts/create-token.py --coin=ETH --symbol=MFT --name='My First Token' ddEEFFDdEEFfddEeffDDEefFdDeeFFDDEeFFddEe

Deploy the token on the ETH blockchain:

$ mmgen-txdo --coin=eth --tx-gas=200000 --contract-data=SafeMath.bin
$ mmgen-txdo --coin=eth --tx-gas=250000 --contract-data=Owned.bin
$ mmgen-txdo --coin=eth --tx-gas=1100000 --contract-data=Token.bin
...
Token address: abcd1234abcd1234abcd1234abcd1234abcd1234

These Gas amounts seem to work for these three contracts, but feel free to experiment. Make sure you understand the difference between Gas amount and Gas price!

Create an MFT token tracking wallet and import your ETH addresses into it:

$ mmgen-addrimport --coin=eth --token-addr=abcd1234abcd1234abcd1234abcd1234abcd1234 ABCDABCD-ETH[1-5].addrs

View your MFT tracking wallet:

$ mmgen-tool --coin=eth --token=mft twview

Other token parameters can be customized too. Type scripts/create-token.py --help for details.

Bitcoin Cash Node (BCH) and Litecoin (LTC)

Bitcoin Cash Node (BCH) and Litecoin are fully supported by MMGen Wallet.

To transact BCH or Litecoin, first make sure the Bitcoin Cash Node or Litecoin daemons are properly installed (source)(binaries), running and synced.

MMGen Wallet requires that the bitcoin-bchn daemon be listening on non-standard RPC port 8432. If your daemon version is >= 0.16.2, you must use the --usecashaddr=0 option.

Then just add the --coin=bch or --coin=ltc option to all your MMGen Wallet commands. It’s that simple!

Monero (XMR)

MMGen Wallet’s Monero support includes automated wallet creation/syncing and transacting via the mmgen-xmrwallet command. Make sure that Monerod is installed and running and that monero-wallet-rpc is located in your executable path.

Install the Python XMR requirements:

(Note that this step is not required for MSYS2, as these requirements were already installed by pacman.)

$ python3 -m pip install -r alt-requirements.txt
$ python3 -m pip install -r xmr-requirements.txt

The following instructions are applicable for a hot wallet setup. To learn how to cold sign transactions using MMGen Wallet’s autosign feature, first familiarize yourself with the basic concepts here and then consult the OFFLINE AUTOSIGNING tutorial on the mmgen-xmrwallet help screen.

To generate five Monero key/address pairs from your default wallet, invoke the following, making sure to answer ‘y’ at the Encrypt prompt:

$ mmgen-keygen --coin=xmr 1-5

In addition to spend and view keys, the resulting key/address file also includes a wallet password for each address (the double SHA256 hash of the spend key, truncated to 16 bytes).

Now create a Monero wallet for each address in the file by invoking the following command:

$ mmgen-xmrwallet create *XMR*.akeys.mmenc

Each wallet will be uniquely named using the address index and encrypted with the address’ unique wallet password. No user interaction is required during the creation process. By default, wallets are synced to the current block height, as they’re assumed to be empty, but this behavior can be overridden:

$ mmgen-xmrwallet --restore-height=123456 create *XMR*.akeys.mmenc

To keep your wallets in sync as the Monero blockchain grows, use the sync subcommand:

$ mmgen-xmrwallet sync *XMR*.akeys.mmenc

No user interaction is required here either, which is very helpful when you have multiple wallets requiring long sync times.

To learn how to transact using your wallets, continue on to the mmgen-xmrwallet help screen.

Key/address generation for Zcash (ZEC)

MMGen Wallet supports generation of Zcash z-addresses.

Generate ten Zcash z-address key/address pairs from your default wallet:

$ mmgen-keygen --coin=zec --type=zcash_z 1-10

The addresses’ view keys are included in the output file as well.

NOTE: Since your key/address file will probably be used on an online computer, you should encrypt it with a good password when prompted to do so. The file can decrypted as required using the mmgen-tool decrypt command. If you choose a non-standard Scrypt hash preset, take care to remember it.

To generate Zcash t-addresses, just omit the --type argument:

$ mmgen-keygen --coin=zec 1-10

Key/address generation for 144 Bitcoin-derived altcoins

To generate key/address pairs for these coins, just specify the coin’s symbol with the --coin argument:

# For DASH:
$ mmgen-keygen --coin=dash 1-10

# For Emercoin:
$ mmgen-keygen --coin=emc 1-10

For compressed public keys, add the --type=compressed option:

$ mmgen-keygen --coin=dash --type=compressed 1-10

If it’s just the addresses you want, then use mmgen-addrgen instead:

$ mmgen-addrgen --coin=dash --type=compressed 1-10

Regarding encryption of key/address files, see the note for Zcash above.

Here’s a complete list of supported altcoins as of this writing:

2give,42,611,ac,acoin,alf,anc,apex,arco,arg,aur,bcf,blk,bmc,bqc,bsty,btcd,
btq,bucks,cann,cash,cat,cbx,ccn,cdn,chc,clam,con,cpc,crps,csh,dash,dcr,dfc,
dgb,dgc,doge,doged,dope,dvc,efl,emc,emd,enrg,esp,fai,fc2,fibre,fjc,flo,flt,
fst,ftc,gcr,good,grc,gun,ham,html5,hyp,icash,infx,inpay,ipc,jbs,judge,lana,
lat,ldoge,lmc,ltc,mars,mcar,mec,mint,mobi,mona,moon,mrs,mue,mxt,myr,myriad,
mzc,neos,neva,nka,nlg,nmc,nto,nvc,ok,omc,omni,onion,onx,part,pink,pivx,pkb,
pnd,pot,ppc,ptc,pxc,qrk,rain,rbt,rby,rdd,ric,sdc,sib,smly,song,spr,start,
sys,taj,tit,tpc,trc,ttc,tx,uno,via,vpn,vtc,wash,wdc,wisc,wkc,wsx,xcn,xgb,
xmg,xpm,xpoke,xred,xst,xvc,zet,zlq,zoom,zrc,bch,etc,eth,ltc,xmr,zec

Note that support for most of these coins is EXPERIMENTAL. Many of them have received only minimal testing, or no testing at all. At startup you’ll be informed of the level of your selected coin’s support reliability as deemed by the MMGen Project.