The asset won't be the bulldozer, but ownership of the bulldozer. How did the natives of the Yap islands know who owned which Rai stones? Through social contracts. The same would be the case for bulldozer ownerships on Ethereum. It's just a way for you to prove to other humans (or programs) that you own the bulldozer. If you sell the bulldozer in real life, then presumably the buyer would want the ownership. The difference here is where the ownership data lives, not necessarily who issues it.

There are stablecoins backed by USD reserves, like USDC. Again, the ethereum contract is only a ledger. The people responsible for giving you USD is going to be Gemini who control the supply of USDC. You having proof that you own USDC allows you to withdraw USD.

There are of course stablecoins that are not backed by USD, but rather backed by ETH directly and the USD peg is maintained through arbitrage, oracles and control systems implemented in the contracts.

Except you keep talking about automation of assets but you haven't answered the question: how does the delivery, and return of the bulldozer work?

How does the delivery and return of my USD work?

At every junction the answer is "well you trust another party and..." - so why is ethereum needed in the process at all? All of this is just companies providing an API for a service (which generally they don't, now, because it's complicated to orchestrate such a thing).

Ethereum is not contributing anything useful here, because everything important is "trust this person" - at which point I'm really just "hiring a lawyer".

Your bulldozer would need to have a chip installed that can connect to Ethereum and read off who the current authorized operator is. The operator and the owner would have to have cards that contain keys that speak a protocol that the bulldozer understands. Once the loan time runs out, the bulldozer locks out the renter.

The GP is describing a system kind of like Zipcar - you go online, you enter payment, and Zipcar allows your card to operate a car for a period of time. So, you might say, so what, we already have a Zipcar, why replace it with the blockchain?

Because if Zipcar goes out of business, all the cards and hardware on Zipcar cars are defunct. If all the hardware talks to contracts on Ethereum, there's no Zipcar to go out of business - you buy the hardware once, but the operation of the system happens on Ethereum, not in Zipcars' SQL database.

> There are stablecoins backed by USD reserves, like USDC. Again, the ethereum contract is only a ledger. The people responsible for giving you USD is going to be Gemini who control the supply of USDC. You having proof that you own USDC allows you to withdraw USD.

This still depends on trust. The blockchain doesn’t verify the backing. And USDC’s attestation is rather late.

Well, yeah, it's a centralized stablecoin. The advantage is that it can be used in Ethereum contracts in DeFi. If you want a stablecoin with no trust assumptions (other than the protocol and governance), there's MakerDAO's DAI.