Full Node vs. miner: verification and block production

A Full Node checks blocks and spends, including signatures, issuance rules and the prohibition of double spending within the accepted history.

A miner seeks a header hash that does not exceed the target. Valid proof of work is insufficient if the rest of the block breaks the rules.

The node compares cumulative work of valid branches; neither block count alone nor connected node count decides.

Hashing power affects the chance of producing the next block. Competing valid branches can cause a reorganization, not arbitrary rewriting of signatures.

Admission and relay policies for unconfirmed transactions can be stricter than consensus. Mempool rejection alone does not make a block invalid.

The template creator selects transactions. In a pool the operator often performs this role; the owner of hashing equipment may not control selection.

Verification uses computation, disk and bandwidth. Running a node alone creates no entitlement to a Bitcoin block reward.

Mining consumes electricity and hardware. Rewards include new issuance and fees; revenue is not profit, and pool payouts depend on the pool's terms.

Independent verification reduces reliance on external data providers. It guarantees neither anonymity, safe keys nor access to all information held by counterparties.

Dominant hashing power can facilitate censorship or reorganization of one's own payments. It does not by itself provide keys to others' coins or permission to create an excessive reward.