How BTCB2 mining works is straightforward at a high level: BTCB2 (Bitcoin BLAKE2b) is a Bitcoin hard fork that replaced the standard SHA-256 proof-of-work algorithm with BLAKE2b, the same hashing algorithm Siacoin ASICs were already built to run. Mining follows the familiar process of hashing a block header, submitting valid shares to a pool, and receiving a share of the reward. The key difference is the algorithm the hardware must solve. This is also what makes BTCB2 different: it shares Bitcoin’s history and rules up to the fork point, but from there it operates as a separate chain using BLAKE2b-compatible hardware rather than the SHA-256 ASICs used by Bitcoin.
What Is the BLAKE2b Algorithm?
BLAKE2b is a cryptographic hashing algorithm originally designed as a faster, more efficient alternative to the SHA-2 family. It was built for general-purpose use, but its structure turned out to be well suited to ASIC implementation, efficient enough on silicon that manufacturers built dedicated chips around it.
For anyone looking for BLAKE2B mining explained in simple terms, the important point is that BLAKE2b is the underlying hashing function that determines which ASIC hardware can participate in a network. Siacoin (SC) adopted BLAKE2b as its proof-of-work algorithm from the start, which is why the hardware market refers to this class of chips as “BLAKE2b-Sia” hardware.
Handshake (HNS) also uses BLAKE2b as its base algorithm, which is part of why some of the same hardware shows up across multiple BLAKE2b-based networks. This shared algorithm is one reason owners of compatible Siacoin hardware may be able to redirect their machines to other BLAKE2b coins, including BTCB2, when the required pool and firmware support is available.
One clarification worth making explicit, since it’s a common point of confusion: BLAKE2b, BLAKE2s, and BLAKE3 are related but distinct algorithms. A chip built for BLAKE2b does not automatically support BLAKE2s or BLAKE3 workloads, and the three are not interchangeable when you’re evaluating hardware or pool compatibility.
How BTCB2 Mining Works: Step-by-Step
Understanding how BTCB2 mining works starts with the fork itself and then follows the same basic mining sequence used by other proof-of-work networks.
1. BTCB2 Splits From Bitcoin at the Fork
BTCB2 exists because the Bitcoin Knots client implemented the BIP-110 proposal, changing Bitcoin’s proof-of-work algorithm from SHA-256 to BLAKE2b at block height 961,640. Everything before that block is shared history with the original SHA-256 Bitcoin chain; everything after diverges into a separate chain with its own rules, its own miners, and its own market.
2. A BLAKE2b ASIC Hashes the BTCB2 Block Header
This is the core mechanic behind how BTCB2 mining works. A Siacoin ASIC’s stock firmware already performs BLAKE2b hashing natively; that’s what it was built to do for Siacoin. Pointing it at BTCB2 doesn’t require new chips or a different mining principle; it requires connecting to a different network that happens to use the same underlying calculation.
This is why compatible Siacoin miners can be relevant to BTCB2 mining even though BTCB2 is a Bitcoin fork. The hardware is compatible because of the proof-of-work algorithm, not because the two networks are otherwise identical.
3. The Miner Connects to a BTCB2 Mining Pool
You configure your miner’s Stratum settings to point at a BTCB2/BLAKE2b pool endpoint rather than a Siacoin endpoint. Some pools separate connections by hardware type, for example, a dedicated port for ASIC traffic and separate ports for GPU or CPU miners, since those run the same protocol but start at different difficulty levels. Your miner then submits hashing attempts (“shares”) to the pool exactly as it would for Siacoin.
4. The Mining Pool Validates Shares and Calculates Rewards
The pool reconstructs a full BLAKE2b block header from each share you submit, hashes it, and checks whether it meets the required difficulty. Payout models vary by pool: some use a rolling-window system, where accepted shares stay eligible for a share of rewards across a window covering roughly the last several multiples of network difficulty, meaning a share can keep earning after the block that produced it is found. Others run pure solo payouts, where you receive the full block reward or nothing. Check which model a given pool uses before mining there, since it changes how consistent your payout timing will be.
5. BTCB2 Mining Rewards Are Sent to a Dedicated Wallet
Rewards are sent to a wallet address on the BLAKE2b chain. This is the one step where a mistake actually matters: because BTCB2 shares transaction history with SHA-256 Bitcoin up to the fork block, an address that has ever held real BTC should never be reused here. Always mine to a fresh, dedicated address.
What Makes BTCB2 Different?
The question of what makes BTCB2 different is best answered by comparing it with the two networks most likely to confuse: Bitcoin and Siacoin.
Different from Bitcoin (BTC)
BTCB2 and BTC share identical history up to block 961,640, but from that point they are separate chains with separate consensus rules. Standard Bitcoin ASICs (Antminer S19, S21, WhatsMiner M50, M60) run SHA-256 circuits and cannot mine BTCB2 through a firmware update — the hashing function is physically different at the chip level, not just a protocol setting. BTCB2 also has its own liquidity, exchange listings, and market price, entirely separate from BTC’s.
Different from Siacoin (SC)
This is the distinction people mix up most often. BTCB2 and Siacoin share an algorithm and, as a result, share compatible hardware, but they are not the same network, the same coin, or the same protocol goal. Siacoin is a decentralized cloud storage network with its own token economics. BTCB2 is a Bitcoin fork experimenting with a different proof-of-work algorithm. Mining one does not mine the other, and rewards, difficulty, and market conditions move independently between them.
Algorithm compatibility is not the same as guaranteed working compatibility. Even with the right chip, a full mining connection depends on firmware version, correct Stratum configuration, matching difficulty formatting, and proper share validation on the pool’s end.
For anyone researching what makes BTCB2 different, this distinction is important: BTCB2 borrows Bitcoin’s historical foundation while using a proof-of-work algorithm and hardware ecosystem more closely associated with networks such as Siacoin.
Can Siacoin Miners Really Mine BTCB2 Without New Hardware?
Yes, at the chip level. Models built around BLAKE2b-Sia workloads, including the Goldshell SC5 Pro, SC5 Pro II, SC6 SE, SC Box II, and iBeLink BM-S3/BM-S3+, are genuinely compatible candidates, since they were already designed around the algorithm BTCB2 now uses.
This is the basic reason Siacoin miners mining BTCB2 is technically possible: the ASIC is already designed to perform BLAKE2b hashing. The network being mined changes, but the fundamental hashing capability of the chip does not.
That said, two practical checks matter before you assume a specific unit is ready to go:
Confirm the exact model and firmware against the pool’s current hardware compatibility list. Some pools publish these lists, and they don’t always agree with each other on every model’s specs or support status. Cross-check rather than relying on a single source.
Don’t confuse operating modes. Some hardware (like Handshake-capable units) requires a specific “Sia mode” to be usable for BLAKE2b work at all. Comparing its Handshake-mode hashrate or power draw to Sia-mode figures will give you the wrong numbers.
SHA-256 Bitcoin ASICs remain out of scope entirely; no firmware update bridges that gap.
Why This Matters for Hosted Mining Operations
Because BTCB2 mining runs on the same hardware class as Siacoin mining, the same power draw, the same heat profile, and the same air-cooled infrastructure, moving into BTCB2 doesn’t require a different hosting setup if you’re already hosting Siacoin ASICs.
This creates an opportunity for Siacoin miners mining BTCB2 to use existing infrastructure rather than investing in an entirely new hardware class. The operational side -power, cooling, uptime, and monitoring -stays consistent; only the pool connection and payout wallet change.
If you haven’t looked at what that infrastructure and cost picture actually looks like, it’s worth reviewing before deciding whether hosting or home mining makes more sense for your situation.
Getting Started: What to Check Before Mining BTCB2
Before you begin Siacoin miners mining BTCB2, verify the following:
- Confirm your exact miner model and firmware version against a pool’s published compatibility list; don’t assume from the product category alone
- Set up a fresh wallet address dedicated to BTCB2; never reuse an address that has held BTC
- Understand your chosen pool’s payout model (rolling-window vs. solo) before you start, so payout timing isn’t a surprise
- Check the pool’s fee structure and minimum payout threshold
- Verify current exchange support and liquidity for BTCB2 before assuming you can easily convert or sell rewards
BTCB2 is still an early, experimental chain, so treat all of the above as things to re-verify periodically rather than one-time setup steps.
See How ValueHash Hosts Blake2b-Sia Hardware