It's a testnet for the Liquid sidechain, using Testnet4 for pegins and enabling discount CT fees.
No block signers here (in contrast to the real Liquid network). Generate your blocks. Play. Learn. Zero-fees? Easy. Generate the zero-fee-paying transactions into your blocks and learn about the other fee-related configuration settings (the same as in Bitcoin Core).
Read more in Elements issue #1325 and other inter-linked related issues.
See example and find its testnet4 inputs.
See lt4-pegins.txt.
First make sure to have a (currently self-compiled) Bitcoin Core daemon with testnet4 running locally. Compile from 2024-04-testnet-4-fix branch.
Following is the related part of bitcoin.conf:
[testnet4]
rpcuser=t4user
rpcpassword=t4password
# Can be pruned since Elements
# daemon needs just headers
#prune=550
Add following lines to your elements.conf file:
[liquidtestnet4]
blockmintxfee=0.0000001
acceptdiscountct=1
creatediscountct=1
parentgenesisblockhash=00000000da84f2bafbbc53dee25a72ae507ff4914b867c565be350b0da8bf043
fedpegscript=5321039ef28cb2d4ba1a2652ee6268c5e3252beeb4b6154659edab632991222b71d8102103e0bdc9a133e3a7b3eded49cda15c17c5f27ec997eae7b5aafc63fce9e7e1740b21033d83a7f7424b380fe85f01355e7ec2f381703ae4c73838d82fce2b57c3bd8d0d53ae736402c00fb2695221021947dc0383665f8587b5db47d2f69e8e784977c22eefca6b5e19671c81ab6de921026ab4753ec9f194078d86acb095176dc7aedf43d6df818837974af89d769f85e921023cdcc46d5fc8b06e180cf59d3878e4499b24d214a5165085be5ed07052fbb40d53ae68
server=1
listen=1
txindex=1
validatepegin=1
initialfreecoins=2100000000000000
fallbackfee=0.000002
rpcport=17774
port=18444
mainchainrpcport=48332
mainchainrpcuser=t4user
mainchainrpcpassword=t4password
# above two should match their counterparts in bitcon.conf for testnet4
# i.e. rpcuser=t4user and rpcpassword=t4password in [testnet4] section
addnode=a.anyone.eu.org:18444
# or c7gop5zx4wbkzascujmf2c3lqdls2jvexi6lkitn7z7coijaj7z4hsyd.onion:18444
Now make a directory and run elementsd:
cd ~/.elements
mkdir liquidtestnet4
elementsd -datadir=$PWD \
-chain=liquidtestnet4
See /liquid/gi-lt4.txt and /liquid/lt4-gbci.json (getblockchaininfo)
The port number is now 18444 both on Tor and public IPv4.
Setting blockmintxfee low is needed to put discounted CTs into blocks. Feel free to generate blocks with no tx fees.
Please send leftover sats to el1qqdqjfahlc4flc6y0w8d0ld4rvmkqsltvuvjxh78rdd4j5tz5qx6pdm87zv8ryr0uplevrz3wcw42q2afsfh5q2m5hxlh93szn or send (and do not "mine") a transaction paying everything in fees (example). Peg-outs back to Testnet4 are not automated yet.
See this screen cast.