> For the complete documentation index, see [llms.txt](https://pijschain.gitbook.io/whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pijschain.gitbook.io/whitepaper/system-architecture/node-roles/block-producer-node.md).

# Block Producer Node

The Block Producer Node is responsible for block generation and is governed by the PoSA block-production protocol. The set of block producers is adjusted through on-chain voting and rotates according to a predefined schedule.

Its core responsibilities include producing blocks according to PoSA rotation rules and signing block headers for authentication. In addition, at designated aggregation points, the block-producing node collects and aggregates BLS heartbeat signatures submitted by staking nodes and writes the corresponding online activity bitmap into the block header.

As a result, Block Producer Nodes hold the authority to produce blocks and execute system-level transactions required for network consensus and state persistence.


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