Polygon

Polygon is a sidechain that uses a modified Tendermint PoS consensus mechanism for transaction ordering/inclusion.

It features two chains:

• Heimdall Chain - responsible for selecting Bor validator sets and checkpointing balances back to the main chain (Ethereum)
• Bor Chain - responsible for executing smart contracts and producing blocks.

Blockchain

• Polygon PoS Chain (Apr 2021, Finematics)
• Polygon: L2 or not L2? (June 2021)
  • a brief summary of the behavior of Polygon as a sidechain, plus some discussion of the Polygon SDK for building new blockchains.
• Polygon architecture overview

Ecosystem

• Awesome Polygon
• Polygon ecosystem survey (Aug 2021, The Tie)