Bridge Chains

These chains help connect the different Parachains with the main

Blockchain or the Relay Chain, as shown in Figure 10.2, as follows:

Figure 10.2: Layers of Blockchains in Polkadot

Polkadot makes sure that the Relaychain or the mainchain and the

Parachains or the sidechains share the same state with each other.

Polkadot works on the principle of “Nominated Proof of Stake”

consensus where there can be three different types of members, i.e.,

validator, nominator, and collator, which are described as follows:

Parties can be Validators by staking Polkadot’s native token

“DOT”. Validators, if selected as among the validator set, can

validate and publish blocks on the Relaychain and earn DOT

tokens in the process. They also collect proofs from the