Was Crocodile stronger at Marineford? Or was he holding back in Alabasta?

 During the Alabasta arc, Crocodile displayed a level of power that was initially considered overwhelming by the Straw Hat Pirates. He possessed the Logia-type Devil Fruit called the Suna Suna no Mi (Sand-Sand Fruit), which granted him the ability to control and transform into sand. He had a reputation as a Shichibukai and controlled the desert kingdom of Alabasta from the shadows. His strength was showcased through his battles with Luffy and others. At Marineford, Crocodile was present as part of the war that took place at Marine Headquarters. While he did participate in the battle, he didn't display the same level of dominance as some other powerful characters present. This has led fans to speculate that he might not have been as strong as initially portrayed in Alabasta. It's important to note that power scaling and character abilities can be subject to interpretation and development by the author. Oda often keeps details deliberately open-ended to keep the story intriguing.

What technologies are behind the NFT?

 NFT, or non-fungible token, is a type of digital asset that is stored on a blockchain and represents ownership of a unique digital item or asset. NFTs are often used to represent digital art, collectibles, and other digital assets that have value because of their uniqueness or rarity.

The technologies behind NFTs include:

Blockchain technology: NFTs are stored on a blockchain, which is a decentralized, distributed ledger that allows for the secure and transparent tracking of digital transactions.

Cryptography: NFTs use cryptographic techniques to secure and verify the ownership of the digital asset.

Smart contracts: NFTs often use smart contracts, which are self-executing contracts with the terms of the agreement written into code, to automate the process of transferring ownership and verifying authenticity.

Digital art and media: NFTs can represent a wide range of digital assets, including digital art, music, videos, and other types of media.

Overall, the technologies behind NFTs allow for the creation and ownership of unique digital assets that can be bought and sold like any other asset.