The Polygon Improvement Proposal (PIP) framework, akin to the Ethereum Improvement Proposal (EIP) structure, establishes a coordination layer for upgrades on the Polygon PoS network. This enables ecosystem consensus through forum discussions and Polygon Protocol Governance Calls.

Two proposals, Indore (PIP-12) and Aalborg (PIP-11), are part of the Inborg upgrade facilitated by the PIP infrastructure. Indore aims to enhance the State Sync system to improve network stability and resolve BADBLOCK errors, while Aalborg introduces milestones for faster finality on the Polygon PoS network.

The Polygon PoS network operates on a dual consensus framework comprising Heimdall and Bor. Heimdall activates the State Sync system to read data from Ethereum, which is then transferred to Bor. Bor retrieves State Sync Ethereum data from Heimdall at the start of each sprint using "fromID" and "to" values, representing a unique state identity and a timestamp, respectively.

During block creation in the Bor layer, nodes may go offline and create blocks independently, resulting in multiple divergent chains. PIP proposes the introduction of a new root parameter called stateSyncConfirmationDelay to address uncertainties arising from parallel dimensions and ensure consistent State Sync events retrieval from Heimdall.