BA-08 · LESSON 07

Mining pools and templates

KEY DEFINITIONS

Terms used in this lesson

Proof-of-work target: The maximum header-hash value accepted for a block; lowering it makes valid hashes harder to find.
Hash rate: The number of mining hash attempts performed per second.
Coinbase transaction: The special first transaction in a Bitcoin block, which claims permitted subsidy and fees and has no ordinary prior-output input.

Pools coordinate work and payouts; Stratum and template negotiation affect miner autonomy and centralization.

55 min Difficulty 2/5 Not started

VISUAL MODEL

See the whole mechanism before going step by step

Use the diagrams to orient yourself. Then the guided explanation below teaches every part in depth.

4 explanatory views

CONCEPT-SPECIFIC MAP · proof of workTransactions become an independently validated proof-of-work historySelect any state to inspect its exact role.

RELATIONSHIP MAPOrdered mechanism flow

01
CANDIDATESValid transactions
A miner selects transactions while each node retains its own validation rules.
02
MERKLE ROOTOrdered commitment
Transaction identifiers are reduced to one header commitment.
03
HEADERPrevious hash, target, nonce
The header commits to the parent block, transactions, time, target, and nonce.
04
WORKMining pools and templates
The Mining pools and templates mechanism determines how costly the candidate is to replace.
05
CHAINValid most-work branch
Temporary forks resolve by accumulated work among branches that pass every rule.

Rule shown: Miners propose ordered blocks; full nodes accept only valid blocks and select the valid chain with most accumulated work.

STAGE 1 OF 5CANDIDATES: Valid transactions

A miner selects transactions while each node retains its own validation rules.

Governing relationship: Miners propose ordered blocks; full nodes accept only valid blocks and select the valid chain with most accumulated work. Complete path: 1. CANDIDATES, Valid transactions. A miner selects transactions while each node retains its own validation rules. 2. MERKLE ROOT, Ordered commitment. Transaction identifiers are reduced to one header commitment. 3. HEADER, Previous hash, target, nonce. The header commits to the parent block, transactions, time, target, and nonce. 4. WORK, Mining pools and templates. The Mining pools and templates mechanism determines how costly the candidate is to replace. 5. CHAIN, Valid most-work branch. Temporary forks resolve by accumulated work among branches that pass every rule.

1. State transitionWhat exists, what changes, and what results

BEFORE

Pool share target gives success every 1,000 hashes on average, while network target gives success every 1,000,000 hashes.

MECHANISM

A pool or miner selects transactions, coinbase outputs, version signals, time, and parent, then derives data workers can vary.

AFTER

Pooling smooths revenue but can concentrate transaction selection, payout custody, and operational control.

Text equivalent: Starting from Pool share target gives success every 1,000 hashes on average, while network target gives success every 1,000,000 hashes. The mechanism begins when A pool or miner selects transactions, coinbase outputs, version signals, time, and parent, then derives data workers can vary. The resulting lesson is Pooling smooths revenue but can concentrate transaction selection, payout custody, and operational control.

2. Mechanism pathSelect a stage to inspect its job

STAGE 1 OF 5

Construct a candidate template

A pool or miner selects transactions, coinbase outputs, version signals, time, and parent, then derives data workers can vary.

Complete path: 1. Construct a candidate template: A pool or miner selects transactions, coinbase outputs, version signals, time, and parent, then derives data workers can vary. 2. Distribute jobs: Workers receive header-related fields and a share target easier than the Bitcoin network target. 3. Submit shares: A hash below the share target proves work for accounting. A rarer hash below the network target is also a publishable block candidate. 4. Calculate payouts: Pools use pay-per-share, proportional, score-based, or other methods that distribute variance and pool fees differently. 5. Analyze template authority: If one operator selects all transactions, nominally separate miners may share censorship power. Miner-selected templates or negotiation can redistribute that choice.

3. Rule and failure boundaryWhat accepts the result and where it can stop

ACCEPTED PATH

The template includes every dependency before its child within capacity, share and network targets classify each hash, and the payout ledger assigns variance explicitly.

CHANGED CONDITION

A greedy choice can strand capacity, a share-only hash cannot extend Bitcoin, and centralized template authority can omit transactions despite distributed workers.

Important distinction: Every mining-pool share is a small fragment of a future Bitcoin block. A share is proof of lower-difficulty work for pool accounting. It is not combined into a block; only a hash meeting the network target can prove a block.

Text equivalent: The accepted path is enforced by The template includes every dependency before its child within capacity, share and network targets classify each hash, and the payout ledger assigns variance explicitly. If the required condition changes, A greedy choice can strand capacity, a share-only hash cannot extend Bitcoin, and centralized template authority can omit transactions despite distributed workers.

Loading lesson visuals...

Learn the idea

A mining pool combines many miners' hash rate and pays them from more frequent pool revenue. The pool gives miners block-template work and receives lower-difficulty shares that prove contributed hashing. A share is not normally a valid Bitcoin block. Stratum is a family of pool protocols that coordinates jobs, shares, and block candidates; template control affects censorship and decentralization.

GUIDED EXPLANATION1/5 ideas inspected

Construct a candidate template

A pool or miner selects transactions, coinbase outputs, version signals, time, and parent, then derives data workers can vary.

The worked example follows the explanation

Inspect every idea above to open it.

Important distinction“Every mining-pool share is a small fragment of a future Bitcoin block.”

A share is proof of lower-difficulty work for pool accounting. It is not combined into a block; only a hash meeting the network target can prove a block.

FINISH LEARNING FIRST

The questions unlock after every required learning activity

Inspect every guided idea, open the worked example, rebuild its mechanism, and complete the deterministic lesson tool. Your progress is saved automatically.