How to Merge-Mine Pearl (PRL) + modelOS (MDL) — Complete Beginner’s Guide

7 min readJun 28, 2026

Mine two coins with one GPU. Earn Pearl (PRL) and modelOS (MDL) at the same time — same hashrate, same rig, zero extra cost.

Merge mining is the easiest way to boost your mining income today. With HeroMiners you point your miner at the Pearl (PRL) pool exactly as you always have, add your modelOS (MDL) wallet address, and the pool does the rest — you get paid in both coins from the same work. No second rig, no extra electricity, no drop in your Pearl hashrate.

This complete beginner’s guide shows you, step by step, how to set up Pearl + modelOS merge mining on Windows, Linux and HiveOS, using SRBMiner, bzminer and other popular miners.

What is modelOS (MDL)?

modelOS (MDL) is a coin that is merge-mined together with Pearl (PRL). It shares Pearl’s Proof-of-Useful-Work algorithm (pearlhash), which means every valid Pearl share you submit can also secure a modelOS block — at no extra effort. modelOS uses modern Taproot mdl1p… addresses and the same fast, satoshi-style payout structure miners already know from Pearl.

Because modelOS rides on Pearl’s work, you do not need a separate miner, a separate algorithm, or extra hardware to mine it. If you can mine Pearl, you can mine modelOS — for free.

What is Pearl (PRL)?

Pearl (PRL) is a GPU-mineable coin that uses the pearlhash Proof-of-Useful-Work algorithm. It is mined with NVIDIA and AMD GPUs using miners such as SRBMiner-Multi and bzminer. Pearl is the parent chain in this setup: you connect to the Pearl stratum, mine pearlhash, and modelOS is produced alongside it through merge mining.

What is merge mining (and why it’s free extra income)?

Merge mining lets a miner work on two blockchains at once using a single Proof-of-Work effort. Your GPU produces one stream of pearlhash work. The pool checks each result against both the Pearl network target and the modelOS network target:

A result good enough for Pearl → a Pearl block is found.
A result good enough for modelOS → a modelOS block is found.
Many results satisfy both at once.

The key point for you as a miner: merge mining does NOT split or reduce your Pearl hashrate. You earn the same Pearl you always did, plus modelOS on top. It is genuinely “two coins for the price of one”.

You don’t have to build the modelOS blocks yourself — the pool builds them server-side from your Pearl shares. All you do is tell the pool your modelOS address.

Pool Features

⚡ True merge mining — earn Pearl (PRL) and modelOS (MDL) from one GPU, one connection.
🔒 One port, TCP + TLS — connect with stratum+tcp:// or stratum+ssl:// on the same port (1200).
🌍 Global servers — 14 regions worldwide for low latency and fewer stale shares.
💸 0% pool fee — keep more of what you mine. (To celebrate the launch, we are offering 0% pool fees until August 1, 2026.)
🧱 Fair PROP-style rewards on the pearlhash (PoUW) algorithm.
📊 Live stats & full transparency — track your Pearl rig at pearl.herominers.com and your modelOS rewards at the modelOS pool dashboard.
🟢 No special miner required — works with the standard Pearl miners you already use.

Before You Start — What You Need

A working GPU mining rig (NVIDIA or AMD) capable of mining Pearl / pearlhash.
A Pearl (PRL) wallet address (starts with prl1…).
A modelOS (MDL) wallet address (starts with mdl1p…).
Mining software — SRBMiner-Multi, bzminer, PeakMiner, forge or ARCMiner.

That’s it. If you are already mining Pearl, you only need to add step 2.

Step 1 — Get Your Pearl (PRL) Wallet Address

Download and set up the official Pearl wallet, or use an exchange/wallet that supports Pearl, and copy your receiving address (it starts with prl1…). This is where your Pearl mining rewards will be sent. Never use someone else's address — you mine to your own wallet.

Step 2 — Get Your modelOS (MDL) Wallet Address

Set up your modelOS wallet and copy your modelOS receiving address (it starts with mdl1p…). This is where your modelOS rewards will be sent.
https://compute.modeloslab.xyz/

⚠️ Double-check both addresses. Your Pearl rewards go to your prl1… address and your modelOS rewards go to your mdl1p… address. If you enter an invalid modelOS address the pool will reject your login and tell you why, so you never accidentally mine to the wrong place.

You can watch this video to learn how to do Pearl (PRL) + modelOS (MDL) merged mining.

Step 3 — Download Your Mining Software

Pick any miner that supports Pearl (pearlhash):

SRBMiner-Multi (AMD + NVIDIA, Windows + Linux + HiveOS) — most popular.
bzminer (AMD + NVIDIA).
PeakMiner, forge, ARCMiner.

Always download miners only from their official GitHub releases.

Step 4 — Configure Merge Mining (The Key Step)

This is the only thing that’s different from normal Pearl mining. Instead of using just your Pearl address, you join your Pearl and modelOS addresses with a “+” sign:

YOUR_PRL_ADDRESS+YOUR_MDL_ADDRESS

The part before the “+” is your Pearl payout address. The part after the “+” is your modelOS payout address. Add your worker (rig) name after a dot “.” as usual.

Final wallet format:

YOUR_PRL_WALLET_ADDRESS+YOUR_MDL_WALLET_ADDRESS.YOUR_WORKER_NAME

You connect to the Pearl stratum on port 1200 — the same stratum and port as solo Pearl mining. Merge mining is handled entirely by the pool.

SRBMiner-Multi (Windows / Linux)

SRBMiner-MULTI --algorithm-gpu pearlhash --pool de.pearl.herominers.com:1200 --wallet YOUR_PRL_ADDRESS+YOUR_MDL_ADDRESS.YOUR_WORKER_NAME

For an encrypted (TLS) connection, add --tls true.

bzminer

bzminer.exe -a pearl -p stratum+tcp://de.pearl.herominers.com:1200 -w YOUR_PRL_ADDRESS+YOUR_MDL_ADDRESS.YOUR_WORKER_NAME

For TLS, use stratum+ssl://de.pearl.herominers.com:1200.

forge

forge.exe --algorithm pearlhash --pool stratum+tcp://de.pearl.herominers.com:1200 --wallet YOUR_PRL_ADDRESS+YOUR_MDL_ADDRESS.YOUR_WORKER_NAME

PeakMiner

peakminer.exe --coin pearl -o de.pearl.herominers.com:1200 -u YOUR_PRL_ADDRESS+YOUR_MDL_ADDRESS.YOUR_WORKER_NAME

HiveOS (SRBMiner flight sheet)

Use a custom miner flight sheet with:

Pool URL: de.pearl.herominers.com:1200
Algorithm: pearlhash
Wallet / template: YOUR_PRL_ADDRESS+YOUR_MDL_ADDRESS
Pass: x

Everything else stays exactly as in a normal Pearl flight sheet.

Step 5 — Choose Your Closest Server

Pick the region nearest to you for the lowest latency and fewest stale shares. Just swap the prefix on pearl.herominers.com:1200:

us · ca · br · de · fr · es · fi · tr · ru · hk · sg · kr · au

Example: us.pearl.herominers.com:1200, sg.pearl.herominers.com:1200, fr.pearl.herominers.com:1200.

Step 6 — Start Mining and Check Your Stats

Start your miner. Within a few minutes your worker will appear online.

Pearl stats & payouts: open pearl.herominers.com and paste your Pearl (prl1…) address.
modelOS stats & payouts: open the modelOS pool dashboard (modelos.herominers.com) and paste your modelOS (mdl1p…) address.

You will see two independent dashboards — one for each coin — both powered by the same rig.

Step 7 — Getting Paid

Payouts are automatic and separate for each coin:

Pearl is paid to your prl1… address once you reach the minimum payout (1 PRL).
modelOS is paid to your mdl1p… address under modelOS's own payout rules.

There is no extra fee for merge mining — you simply receive two payout streams instead of one.

Pool Connection Details (Quick Reference)

Algorithm: pearlhash (Proof-of-Useful-Work)
Pool host: pearl.herominers.com (+ regional prefixes)
Port: 1200 (plain TCP and TLS/SSL on the same port)
Merge wallet format: PRL_ADDRESS+MDL_ADDRESS.WorkerName
Pearl address: prl1… · modelOS address: mdl1p…
Pearl stats: pearl.herominers.com · modelOS stats: modelos.herominers.com

Frequently Asked Questions (FAQ)

Does merge mining reduce my Pearl hashrate or rewards?
No. You mine Pearl exactly as before and earn the same Pearl. modelOS is produced from the same shares, so it’s pure extra income — your Pearl earnings are not split or lowered.

Do I have to merge-mine modelOS? Is the modelOS address mandatory?
No — merge mining is completely optional. If you leave the modelOS (MDL) address empty, the pool keeps mining Pearl with your full hashrate and pays your Pearl rewards to your own Pearl wallet, exactly like a normal Pearl-only setup. In that case the modelOS coins your hashrate produces are kept by the pool — you simply don’t receive modelOS, but your Pearl mining is completely unaffected.

Do I need two miners or two rigs?
No. One miner, one GPU, one connection to the Pearl stratum. The pool builds the modelOS blocks for you.

Do I need to change my algorithm or download special software?
No. You mine the normal pearlhash algorithm with the standard Pearl miners (SRBMiner, bzminer, etc.). The only change is adding your modelOS address after a “+”.

What if I only want to mine Pearl?
Just use your Pearl address with no “+” and no modelOS address — it works exactly like normal Pearl mining.

What happens if I enter a wrong modelOS address?
The pool rejects the login and shows you a clear message, so you can fix it. You will never silently mine modelOS to the wrong wallet.

Which GPUs can I use?
Any NVIDIA or AMD GPU that supports Pearl (pearlhash). Use the latest official miner release for best performance.

Where do I see my modelOS rewards?
On the modelOS pool dashboard (modelos.herominers.com), using your mdl1p… address. Your Pearl rewards stay on pearl.herominers.com.

TCP or TLS — which port do I use?
The same port, 1200, serves both. Use stratum+tcp:// for plain or stratum+ssl:// for an encrypted connection.

Conclusion

Merge mining Pearl (PRL) and modelOS (MDL) is the simplest way to earn two coins from one GPU with no extra cost and no hashrate loss. You keep mining Pearl on the pearlhash algorithm exactly as you do today — you just add your modelOS address with a “+”, and HeroMiners pays you in both coins automatically.

Start merge mining Pearl + modelOS today at pearl.herominers.com — connect on port 1200, add your mdl1p… address, and double your rewards.

Happy mining! 🚀