Musig Module Tutorial
MuSig is currently only available on MacOS and Linux operating systems.
Please check with the Komodo team on Discord for information regarding Windows functionality.
Ensure that local repositories are up to date:
sudo apt-get update && sudo apt-get upgrade -y
Install Dependencies:
sudo apt-get install build-essential pkg-config libc6-dev m4 g++-multilib autoconf libtool ncurses-dev unzip git python zlib1g-dev wget bsdmainutils automake libboost-all-dev libssl-dev libprotobuf-dev protobuf-compiler libgtest-dev libqt4-dev libqrencode-dev libdb++-dev ntp ntpdate software-properties-common curl libcurl4-gnutls-dev cmake clang libsodium-dev -y
Build komodod by executing the following series of commands. Each line should be executed separately:
git clone https://github.com/jl777/komodo
cd komodo
git checkout jl777
./zcutil/fetch-params.sh
./zcutil/build.sh -j$(nproc)
Compile the appropriate library:
cd src/cc
./makecclib
cp sudokucc.so ../libcc.so
cd ../..
make -j$(nproc)
Update the komodod daemon by executing the following series of commands. Each line should be executed separately:
cd komodo
git checkout jl777
git pull
cd src/cc
./makecclib
cd ../..
make -j$(nproc)
Change into the ~/komodo/src directory:
cd ~/komodo/src
Launch the MuSig Smart Chain using the following launch parameters.
./komodod -ac_name=MUSIG -ac_supply=100000 -ac_reward=10000000 -pubkey=<yourpub> -ac_cclib=sudoku -ac_cc=2 -addnode=5.9.102.210 &
Without a pubkey, the MuSig Smart Chain will not function properly on the user's local machine. Follow these instruction for obtaining and setting a pubkey:
Once the Smart Chain is relaunched with the new pubkey included as a launch parameter, the MuSig Smart Chain is prepared for use.
The reader should launch the Smart Chain with a pubkey whose private key is already imported to the wallet. If this is not the case, restart the Smart Chain with an appropriate pubkey, or use the importprivkey method to import the private key of the desired pubkey.
The MuSig Smart Chain has an available faucet. The faucet allows a user to obtain a nominal amount of funds for testing and orientation purposes.
Ensure that the terminal's working directory is in the ~/komodo/src directory:
cd ~/komodo/src
Execute the faucetget method:
./komodo-cli -ac_name=MUSIG faucetget
This method returns a hex value in the terminal. Select the entire hex value and copy it to the clipboard. (Use CTRL + SHFT + C to copy within the terminal)
Broadcast the hex value using the sendrawtransaction method:
./komodo-cli -ac_name=MUSIG sendrawtransaction <hex copied from the above response>
Wait for the transaction to be confirmed.
Once the broadcast transaction is confirmed, check the balance using the getbalance method:
./komodo-cli -ac_name=MUSIG getbalance
There should be a small amount of funds in the balance.
The aim of this example is to create a 20f2 MuSig pubkey, fund it, and spend from it.
To accomplish this, two nodes are necessary.
In this MuSig example we use the following pubkeys on our two nodes:
- Node1's daemon is launched using the pubkey:
0225f1cbbda1a0c406bb8f6dc7a589d88b2f9e28cd4fdb3f59139f8aff1f5d270a - Node2's daemon is launched using the pubkey:
02d3431950c2f0f9654217b6ce3d44468d3a9ca7255741767fdeee7c5ec6b47567
The EVALCODE for the MuSig module is 18.
For this example, we use the normal array formatting for cclib methods, as we are not creating a bash script.
Steps 1 through 5 and 11 through 12 need to be executed only on the first node.
Use the combine method to create a combined_pk address:
Command:
./komodo-cli -ac_name=MUSIG cclib combine 18 '["0225f1cbbda1a0c406bb8f6dc7a589d88b2f9e28cd4fdb3f59139f8aff1f5d270a","02d3431950c2f0f9654217b6ce3d44468d3a9ca7255741767fdeee7c5ec6b47567"]'
Copy the values of pkhash and combined_pk and save them in a secure location for later use.
Use the send method to send 1 coin to the combined_pk address:
Command:
./komodo-cli -ac_name=MUSIG cclib send 18 '["03d31479e789014a96ba6dd60d50210045aa8292fe693f293d44615929f04cf57a",1]'
Copy the hex value to your clipboard.
Use the sendrawtransaction method to broadcast the raw hex value:
Command:
./komodo-cli -ac_name=MUSIG sendrawtransaction 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
The returned value is our sendtxid. Copy this to a secure location for later use.
Use the getrawtransaction method to decode the raw transaction.
Command:
./komodo-cli -ac_name=MUSIG getrawtransaction 09daa45cb6e17028f9568347291a993cbf29c152a527b53e9ac0925d4900c293 1
In the response there are a series of vout values, each of which has an array of json objects. Search for the vout value that has the "type":"pubkey" key pair listed. In this object, retrieve the hex value from the scriptPubkey:
... (omitted for brevity) ...
"vout": [
... (omitted for brevity) ...
{
"value": 0.09980000,
"valueSat": 9980000,
"n": 1,
"scriptPubKey": {
"asm": "0225f1cbbda1a0c406bb8f6dc7a589d88b2f9e28cd4fdb3f59139f8aff1f5d270a OP_CHECKSIG",
"hex": "210225f1cbbda1a0c406bb8f6dc7a589d88b2f9e28cd4fdb3f59139f8aff1f5d270aac",
"reqSigs": 1,
"type": "pubkey",
"addresses": [
"RUfCUd3UryKJ49baQvSuAs42wakNunvvfT"
]
}
},
... (omitted for brevity) ...
]
... (omitted for brevity) ...
This hex is our change_script value. Save this to a secure location for later use.
Use the calcmsg method to calculate the msg value. The calcmsg method needs the sendtxid and change_script values retrieved from previous commands.
cclib calcmsg 18 '["insert_sendtxid_here","insert_change_script_here"]'
Command:
./komodo-cli -ac_name=MUSIG cclib calcmsg 18 '["09daa45cb6e17028f9568347291a993cbf29c152a527b53e9ac0925d4900c293","210225f1cbbda1a0c406bb8f6dc7a589d88b2f9e28cd4fdb3f59139f8aff1f5d270aac"]'
Copy the msg value to a secure location for later use.
From this point forward, all steps should be executed on both nodes 1 and 2.
After each step performed on each node, copy the relevant data to the opposing node.
The following session command requires an array of arguments. The arguments are as follows:
ind: the index of the signatory in the set. In this example our current node, Node 1, is0numsigners: the number of pubkeys participating in the multi-signature transactioncombined_pk: thecombined_pkaddress, retrieved previouslypkhash: thepkhashvalue, retrieved previouslymsg: themsgto be signed, retrieved previously
Command:
./komodo-cli -ac_name=MUSIG cclib session 18 '[0,2,"03d31479e789014a96ba6dd60d50210045aa8292fe693f293d44615929f04cf57a","8897e150bfb07d3f967ffadb4b0f3c84ea73a94c0d715c4b7e6d9c816c5113a9","3ef43614242afd3c57e02a75a3bc99342fea7c731f6190b791c0f99826789603"]'
Copy the value of commitment both to a secure location and to Node 2.
Execute the same command as before, only change the ind value from 0 to 1 to indicate Node 2.
Command:
./komodo-cli -ac_name=MUSIG cclib session 18 '[1,2,"03d31479e789014a96ba6dd60d50210045aa8292fe693f293d44615929f04cf57a","8897e150bfb07d3f967ffadb4b0f3c84ea73a94c0d715c4b7e6d9c816c5113a9","3ef43614242afd3c57e02a75a3bc99342fea7c731f6190b791c0f99826789603"]'
Copy the commitment value both to a secure location and to Node 1.
The commit method requires an array of arguments. The arguments are as follows:
pkhash: thepkhashvalue, retrieved previouslyind: the index of the opposite node. In our example, Node 2 is1commitment: thecommitmentvalue from the opposing node
Command:
./komodo-cli -ac_name=MUSIG cclib commit 18 '["8897e150bfb07d3f967ffadb4b0f3c84ea73a94c0d715c4b7e6d9c816c5113a9",1,"2854473733147ebdbf2fb70b956c8086c9d7659ca0093627fe0371098f8bc003"]'
Copy the nonce value both to a secure location and to Node 2.
Execute the same command as before, only change the value of ind to 0 to indicate Node 1.
Command:
./komodo-cli -ac_name=MUSIG cclib commit 18 '["8897e150bfb07d3f967ffadb4b0f3c84ea73a94c0d715c4b7e6d9c816c5113a9",0,"a886a3a3c57efec161f6f72554b66f837de89ffdabe0acc46ae4cd59aab8129e"]'
Copy the nonce value both to a secure location and to Node 1.
The nonce method requires an array of arguments. The arguments are as follows:
pkhash: thepkhashvalue, retrieved previouslyind: the index of the opposing node. In our example, the index of Node 2 is1.nonce: thenoncefrom the opposing node
Command:
./komodo-cli -ac_name=MUSIG cclib nonce 18 '["8897e150bfb07d3f967ffadb4b0f3c84ea73a94c0d715c4b7e6d9c816c5113a9",1,"02402fe26abd7ed2cf22d872a6b22ced4309aac8ec273b9c89e0f8f5b77f1574db"]'
Copy the partialsig value both to a secure location and to Node 2.
Execute the same command, only change the ind value to 0 to indicate Node 1, and change the nonce to the value retrieved from Node 1.
Command:
./komodo-cli -ac_name=MUSIG cclib nonce 18 '["8897e150bfb07d3f967ffadb4b0f3c84ea73a94c0d715c4b7e6d9c816c5113a9",0,"0379f6f42cf4c2cb30d064a6cac22ab6ffb3d93388d49b07f0623ff9bc8d191f89"]'
Copy the partialsig value both to a secure location and to Node 1.
The partialsig method requires an array of arguments. The arguments are as follows:
pkhash: thepkhashvalue, retrieved previouslyind: the index of the opposing node. In our example, the index of Node 2 is1partialsig: thepartialsigretrieved from the opposing node
Command:
./komodo-cli -ac_name=MUSIG cclib partialsig 18 '["8897e150bfb07d3f967ffadb4b0f3c84ea73a94c0d715c4b7e6d9c816c5113a9",1,"9e964dfd402f973ea1e9407e19918b1c3897ff6544d60dcdb19cfb0e5bc4c0c1"]'
Copy the combinedsig value both to a secure location and to Node 2.
Execute the same command, but change the ind value to 0 to indicate Node 1, and change the partialsig to the value retrieved from Node 1 previously.
Command:
./komodo-cli -ac_name=MUSIG cclib partialsig 18 '["8897e150bfb07d3f967ffadb4b0f3c84ea73a94c0d715c4b7e6d9c816c5113a9",0,"dc913a9e7532c8edf2f822f482afdcf48c61919bf905fb77f6684a2d7e58d972"]'
Copy the combinedsig value to a secure location.
If the values of combinedsig produced by both nodes is the same, then you have followed the example without any errors to this point. Visually verify that this combinedsig value matches with the combinedsig value returned on Node 1.
The verify method requires an array of arguments. The arguments are as follows:
msg: themsgvalue, retrieved previouslycombined_pk: thecombined_pkvalue, retrieved previouslycombinedsig: thecombinedsigvalue, retrieved previously
Command:
./komodo-cli -ac_name=MUSIG cclib verify 18 '["3ef43614242afd3c57e02a75a3bc99342fea7c731f6190b791c0f99826789603","03d31479e789014a96ba6dd60d50210045aa8292fe693f293d44615929f04cf57a","4b3a9b2b162802bc6c2cca2d22e70ab1cf738a9d4f5692f4f881d0cce0319c137b27889bb562602c94e163729c4168120a4ab41a8e936909e832e6af09e758f2"]'
Execute the same command on Node 2.
Command:
./komodo-cli -ac_name=MUSIG cclib verify 18 '["3ef43614242afd3c57e02a75a3bc99342fea7c731f6190b791c0f99826789603","03d31479e789014a96ba6dd60d50210045aa8292fe693f293d44615929f04cf57a","4b3a9b2b162802bc6c2cca2d22e70ab1cf738a9d4f5692f4f881d0cce0319c137b27889bb562602c94e163729c4168120a4ab41a8e936909e832e6af09e758f2"]'
The response from both nodes should display a "result": "success" key pair. If this is not the case, you made an error in a previous step.
Currently, each node will output different raw transaction values, as both nodes are attempting to spend funds to their own wallets. Of the two, the node that broadcasts its returned raw transaction value first will receive the coins. The other node does not need to create or broadcast a transaction value.
We are now prepared to execute the spend method.
The spend method requires an array of arguments. The arguments are as follows:
sendtxid: thesendtxid, retrieved previouslychange_script: thechange_scriptvalue, retrieved previouslycombinedsig: thecombinedsigvalue, retrieved previously
Command:
./komodo-cli -ac_name=MUSIG cclib spend 18 '["09daa45cb6e17028f9568347291a993cbf29c152a527b53e9ac0925d4900c293","210225f1cbbda1a0c406bb8f6dc7a589d88b2f9e28cd4fdb3f59139f8aff1f5d270aac","4b3a9b2b162802bc6c2cca2d22e70ab1cf738a9d4f5692f4f881d0cce0319c137b27889bb562602c94e163729c4168120a4ab41a8e936909e832e6af09e758f2"]'
Copy the hex value to a secure location.
In this example, our desire is to receive the transferred coins on Node 1, not on Node 2.
Therefore, it is not necessary to execute the spend method again, nor is it necessary for Node 2 to execute the following step.
Broadcast the hex value using sendrawtransaction:
./komodo-cli -ac_name=MUSIG sendrawtransaction "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"
Once the broadcast transaction is mined and notarized, the MuSig transaction is complete.
You have now successfully executed a full cycle of the MuSig module.