What is "proof of work" or "proof of stake"? | Coinbase

Marble Card #224000 with a unique link to https://www.coinbase.com/learn/crypto-basics/what-is-proof-of-work-or-proof-of-stake | This URL can only exist on one card. Creating Marble Cards is a way to bookmark and show appreciation for web content. It’s an Internet indexing game where you can create, battle and trade unique NFT frames of web content. The image in the circle is not part of the Marble Card NFT. It comes from the OpenGraph and is shown as a preview of the linked URL, same as when shared on social media.

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Updated card details
Marble Card ID #224000
Marbled at Monday 22nd of November 2021 12:45:48 PM
Marbled from 0x0d1968105dd4cC607D946988cf44De14DA8aA658
Network matic
Collection Coinbase.com
Collection ID #515
Level 48 48
Generation gen2
Type Basic
Remarbles 0
Image Source https://cdn.marble.cards/images/cards/306/306596/306596-share.png?version=2