BTCB2 (Bitcoin BLAKE2b) is a hard fork of Bitcoin that swapped the SHA-256 proof-of-work algorithm for BLAKE2b, the same hashing algorithm used by Siacoin ASICs. That means Goldshell SC-series and iBeLink BM-S3 miners, hardware most people bought for Siacoin, can point at BTCB2 without new equipment. As one of the newer BLAKE2b coins, BTCB2 has created another potential use for existing
BLAKE2b-compatible hardware. Hosting one of these miners in a professional, air-cooled facility typically costs a power rate of roughly 6–7.5 cents per kWh plus a hosting/management fee, since these units draw 400W–3,300W and don’t need the immersion cooling that high-density SHA-256 rigs require. Returns depend entirely on BTCB2’s price, liquidity, and network difficulty at any given time. Treat any profitability figure as a live calculation, not a fixed promise, because this is a new, experimental fork.
What Is BTCB2 (Bitcoin BLAKE2b), and Why Does It Involve Siacoin Miners?
BTCB2 is the market ticker for a Bitcoin hard fork built on the BIP-110 proposal, activated by the Bitcoin Knots client at block height 961,640. Instead of mining with SHA-256, the algorithm that every standard Bitcoin ASIC (Antminer S19/S21, WhatsMiner M50/M60) runs, this fork changed proof-of-work to BLAKE2b, the same hashing function Siacoin (SC) was built around from the start.
That single design choice is why BTCB2 has generated so much interest among Siacoin miners specifically. BTCB2 is one of the newer BLAKE2b coins, but its mining ecosystem is closely connected to existing Siacoin hardware because both use BLAKE2b-based proof of work. The chain shares its transaction history with the original SHA-256 Bitcoin chain up to the fork block, but from that point on it runs independently. It is not an upgrade to BTC, and it does not affect the SHA-256 chain that continues to carry the BTC ticker. Exchanges and mining pools use “BTCB2” (or sometimes “XBT”) as a label purely to keep the two chains from being confused, since a ticker has to be unique.
One important safety note: because the two chains share history before the fork, addresses holding real BTC should never be reused on the BLAKE2b chain. Use a fresh wallet for any BTCB2 activity.
Which ASICs Can Actually Mine BTCB2?
Compatibility comes down to the hashing algorithm a chip physically performs, not the branding on the machine. Relevant models include:
- Goldshell SC5 Pro / SC5 Pro II / SC Lite – Siacoin’s primary ASIC line
- Goldshell SC6 SE – higher-throughput Siacoin hardware
- Goldshell SC Box II – a lower-power, entry-level unit
- iBeLink BM-S3 / BM-S3+ – a competing BLAKE2b-Sia ASIC
Standard Bitcoin SHA-256 ASICs cannot switch over through a firmware update; the circuits are physically built for a different calculation. Compatibility at the chip level also doesn’t guarantee a plug-and-play result. Firmware, Stratum configuration, pool difficulty settings, and share validation all need to line up correctly with the specific pool you’re using. Before buying or redirecting hardware, confirm the exact model and firmware version against the pool’s published hardware list rather than assuming every Sia miner listing will work.
The availability of Siacoin ASIC hosting for BTCB2 also gives owners of compatible hardware an alternative to operating these machines at home, particularly when residential power rates, noise, and heat become limiting factors.
What Does BTCB2 Mining Hosting Cost?
Hosting costs for BLAKE2b-Sia hardware break down into two components: electricity and facility/management fees. Understanding these expenses is essential when comparing BLAKE2b mining hosting costs with the cost of operating a miner at home.
Power draw by hardware. These machines pull less power than large SHA-256 rigs:
| Miner | Hashrate | Power Draw | Efficiency |
| iBeLink BM-S3 | 16.5–18 TH/s | ~3,100 W | ~188 J/TH |
| Goldshell SC6 SE | 17 TH/s | ~3,300 W | ~194 J/TH |
| Goldshell SC Box II | 1.9 TH/s | ~400 W | ~0.211 J/GH |
Electricity rate. Industrial hosting facilities in the U.S. commonly offer 6–7.5 cents per kWh through long-term utility contracts, well below typical residential rates, which is one of the main reasons BTCB2 mining hosting can be attractive compared with running a miner at home once you account for heat, noise, and inconsistent power costs.
Rough monthly power cost example. A single SC6 SE running continuously at 3.3 kW draws about 2,376 kWh a month. At 7 cents/kWh, that’s roughly $166 in electricity before any hosting/management fee is added. A smaller SC Box II at 400W draws about 288 kWh a month, around $20 in power. Hosting providers typically add a per-kWh or flat monthly management fee on top to cover facility operations, monitoring, and support; ask any provider for their exact fee structure before committing.
When comparing BLAKE2b mining hosting costs, look beyond the advertised electricity rate and check whether the provider charges separate management, infrastructure, maintenance, or setup fees.
Pool fees. Most BLAKE2b/BTCB2 pools charge a small percentage fee which is deducted from mining rewards, similar to standard Bitcoin or Siacoin pool structures.
Cooling for Blake2b ASICs: Why Air Cooling Fits This Hardware
Cooling method matters because it drives both facility cost and hardware longevity, and it’s a common point of confusion in mining content. The right mining facility cooling for BLAKE2b miners depends on their power density, heat output, and the scale of the deployment. Two methods dominate the industry:
- Air cooling: fans move ambient or conditioned air across the miner’s heatsinks. It’s the standard approach for most ASIC deployments and works well at moderate power densities.
- Immersion cooling: miners are submerged in a dielectric fluid that pulls heat away directly. It’s built for very high-density deployments where air alone can’t keep up, and it comes with higher upfront infrastructure costs.
Blake2b-Sia hardware sits squarely in the range where air cooling is the appropriate and more cost-effective choice. A rack of SC6 SE or BM-S3 units, drawing 3,000–3,300W each, doesn’t generate the sustained heat density that pushes larger SHA-256 deployments toward immersion. Proper mining facility cooling for BLAKE2b miners should also account for rack density, ambient temperature, airflow management, and continuous operating conditions rather than simply the wattage of an individual ASIC.
ValueHash’s U.S. facilities are purpose-built around air-cooled infrastructure, which keeps operating costs lower and passes those savings on through the power rate, without the added complexity, fluid maintenance, or tank infrastructure immersion setups require.
Realistic Returns: What Actually Drives BTCB2 Profitability
This is the part that deserves the most caution. BTCB2 is a young, experimental fork. Its price, exchange listings, and liquidity can shift quickly, and network difficulty will move as more Siacoin hardware gets pointed at it. Any specific dollar-per-day figure you see today may look very different next week. Rather than quoting a number that will go stale, it’s more useful to understand the variables that actually determine your return:
- BTCB2 market price and liquidity: the single biggest swing factor, and the hardest to predict on a new chain
- Network difficulty: rises as more hashrate joins the chain, directly reducing each miner’s share of block rewards
- Hardware efficiency (J/TH): lower joules-per-terahash means more hashrate per dollar of electricity
- Electricity rate: the fixed cost side of the equation; this is where hosting at 6–7.5 cents/kWh has a real, calculable edge over most home power rates
- Uptime: a miner that’s offline isn’t earning; facility-grade power and connectivity redundancy matters here
- Pool fees and payout structure: typically a small percentage, but worth confirming per pool
Because several of these inputs move daily, run the numbers through a live mining calculator before making a decision, and revisit the calculation periodically rather than treating a one-time estimate as a long-term forecast.
Hosted Mining vs. Running BTCB2 at Home
Running a Siacoin ASIC at home means absorbing residential electricity rates, dealing with the noise and heat output of a 3,000W+ machine, and handling your own uptime and firmware troubleshooting. Hosting shifts all of that to a facility built for it: lower industrial power rates, engineered airflow, 24/7 monitoring, and technicians on-site to handle deployment and repairs.
For miners specifically evaluating Siacoin ASIC hosting for BTCB2, the comparison comes down to more than electricity alone. Facility cooling, uptime, monitoring, connectivity, and technical support can all affect the practical economics of moving a miner out of a residential environment. For anyone weighing the decision in more depth, it’s worth comparing the two paths side by side before shipping hardware anywhere.
For anyone considering BTCB2 mining hosting, it is worth comparing the total operating cost and infrastructure support against the cost of running the same hardware at home before shipping the miner to a facility.
Is BTCB2 Mining Hosting Right for You?
BTCB2 hosting makes the most sense if you already own or are considering Blake2b-Sia hardware and want to diversify what that hardware mines without adding new equipment. It’s a lower-capital way to get exposure to an emerging fork, since the machines involved draw far less power than large-scale Bitcoin SHA-256 deployments, and air-cooled hosting keeps facility costs manageable. It’s not the right fit if you need predictable, low-volatility returns; that expectation doesn’t match an experimental chain that’s only months old.
If you’re holding Siacoin miners and want a clear-eyed read on hosting costs for your specific hardware and power needs, ValueHash’s team can walk through the numbers for your setup, or point you toward a hands-on facility tour before you ship anything.
Talk to ValueHash About Hosting Your Blake2b Miners