Definition
A sidechain is an independently operated blockchain linked to another network through a transfer or communication arrangement. It can support different execution features or performance trade-offs. Unlike systems that derive specified security guarantees from a base chain, a sidechain ordinarily relies on its own consensus participants.
How Transfers Work
A bridge may lock assets on one chain and create or release a representation on the other. The actual process depends on the design and can involve validators, custodians, contracts or proofs. Moving a representation does not mean the original asset literally leaves its native ledger. Returning it typically requires completing the reverse bridge process.
Key Considerations
Sidechains can offer additional functionality, but users must evaluate both the sidechain and the connection mechanism. Validator concentration, bridge permissions and software vulnerabilities can introduce risks beyond those of the original chain. A two-way connection does not guarantee immediate withdrawals or a perfectly maintained peg. A sidechain should not automatically be labeled Layer 2 merely because it is associated with a larger blockchain.