BitcoinIII (BC3) — Coin Info & Chain Specs

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BitcoinIII (BC3)

A Bitcoin Core v29 fork with a sha3t (triple SHA3-256) proof-of-work. Fair launch, no premine, no dev tax — the full 50 BC3 subsidy goes to the miner.

Active sha3t
Coin Specifications
  • Coin name BitcoinIII
  • Ticker BC3
  • Algorithm sha3t · triple SHA3-256
  • Base codebase Bitcoin Core v29 (tag v29.1.1)
  • Block time 10 min (600 s)
  • Difficulty retarget Every 2016 blocks · Bitcoin DAA
  • Max supply 21,000,000 BC3
  • Block reward 50 BC3 → halves every 210,000 blocks
  • Address format bech32 (bc1q…) · legacy P2PKH
  • Genesis date 2026-04-27
Pool Information
  • Pool fee 1 %
  • Payout scheme PPLNS
  • PPLNS window Last 5 blocks
  • Payout schedule Every 15 minutes
  • Minimum payout 0.1 BC3
  • Block confirmations 100 blocks · ≈ 16.7 h
  • Stratum bc3.suprnova.cc · 7700-7705

PPLNS credits your share of the last 5 rounds of work — hop away and stop earning immediately, stay consistent and you earn consistently. Payout transactions wait for the standard 100-confirmation coinbase-maturity window so we never broadcast a spend the daemon would reject.

Fee Structure
Pool fee Flat 1 % of the block reward. 99 % is distributed to miners via PPLNS.
1 %
Devfund None. There is no protocol-mandatory output, no founders reward, no tax. The full 50 BC3 subsidy is claimable by the miner.
0 %
Transaction fees Coinbase-collected transaction fees stay with the pool (currently negligible at this chain age).
Pool
Miner receives 99 % of the current subsidy (49.5 BC3 today) split across the last 5 blocks of shares.
49.5 BC3
Block Subsidy Schedule

BitcoinIII follows the standard Bitcoin halving curve — 50 BC3 at genesis, halved every 210,000 blocks (≈ 4 years). After ~33 halvings the per-block subsidy rounds to zero and only transaction fees remain, exactly as on Bitcoin. There is no devfund tax; the full subsidy shown below is what the coinbase transaction pays out.

subsidy(h) = 50 BC3 >> floor(h ÷ 210,000)
src/validation.cpp :: GetBlockSubsidy() · halvingInterval = 210,000 · cap = 21,000,000 BC3
Era Height Subsidy ≈ Era start
Genesis 0 50 BC3 2026-04-27
1st halving 210,000 25 BC3 ≈ 2030
2nd halving 420,000 12.5 BC3 ≈ 2034
3rd halving 630,000 6.25 BC3 ≈ 2038
4th halving 840,000 3.125 BC3 ≈ 2042
Tail ~6,930,000 0 BC3 · fees only ≈ year 2158

Coinbase outputs become spendable after 100 confirmations (Bitcoin Core's COINBASE_MATURITY, ≈ 16.7 h at 10 min/block) — that's the gate every payout has to clear. The pool's internal ledger credits your share contribution earlier so balances update in the dashboard sooner, but no BC3 leaves the wallet before the 100-conf chain rule is satisfied.

Algorithm — sha3t (triple SHA3-256)

The proof-of-work hash is NIST FIPS 202 SHA3-256 iterated three times over the standard 80-byte block header. Per-block algorithm selection is done by a version-bit in the header: when nVersion & 0x00001000 (SHA3_VBIT) is set the daemon validates with sha3t; otherwise it falls back to Bitcoin's sha256d. Every post-fork block on the live chain sets the bit, so 100 % of BC3 blocks are sha3t.

sha3t(header) = SHA3_256(SHA3_256(SHA3_256(header)))
  where header = 80 bytes (Bitcoin block-header layout)

select(nVersion) = (nVersion & 0x00001000) ? sha3t : sha256d

sha3t is stateless — no dataset, no seed rotation, no hugepages. It's plain SHA3-Keccak arithmetic, so it runs on any CPU or GPU that can compute SHA3. No sha3t ASIC exists today; the fork is young enough that the network is still commodity silicon.

Official BitcoinIII Links

Specs reflect mainnet as of the pool launch. Subsidy schedule sourced from src/validation.cpp::GetBlockSubsidy() in the BitcoinIII-Core tree (release tag v29.1.1). Pool parameters as configured — values updated as the operator tunes them.