Sidetree protocol

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I started studying the sidetree protocol but I can't understand how it works and the architecture. The documentation says (https://identity.foundation/sidetree/spec/#network-topology) that sidetree is a Level 2 protocol that can fit on blockchain as Bitcoin, Ethereum...,but I don't understand how it works and that is the role of some components (for example CAS). Could someone give me an example?

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This sidetree repo contains a reference implementation of the sidetree specification, which uses IPFS as its underlying CAS. CAS/IPFS is simply the storage for all the data generated on this layer 2 network.

ION is a sidetree based network that runs on top of Bitcoin.

Element is a sidetree based network that runs on top of Ethereum.