I don't see them as really that stable, and maybe in the future they can change easily making the code outdated.
Account1 locks "value_of_product"+"penalty" amount of sats
Seller just now sends package
If problems account1 (the one who needs to send package to buyer) lose the "penalty" and it is given to "escrows" who decide his fate. (It's much more complicated than that but to put it simply it's this)

It need to be stored in a decentralized way. Why not bitcoin? You can just hash it with your private key I guess. The problem is how much does it cost to store few strings of data on blockchain. For example
this is the signature for the coordinates of New York using a TestNet4 address.

The problem is how much does it cost to store few strings of data on blockchain.

If the market is decentralized how can I store this data on a central server? I can't. I must create a new blockchain to start this market or can I use bitcoin?

How can you generate an address with a dash inside?

No
I don't think tamper proof is the only way.
Though a smart contract on bitcoin that is made before the purchase, in the description that will solve disputes. To know if a package is missing or damaged I hope there is a way, in any case I think we can do like a pool of escrows that will decide, like today is done by bitcoin nodes that check for transactions to broadcast.
I don't think there is a problem here, they overcollateralize like 2x the amount of the package and can get liquidated before having less collateral than package value.
But if they lock an amount of bitcoins they will get punished if they tamper the package, this can be decided by pools of escrows or smart contract. The pool of escrow get a share of bitcoins for their service in case of problems.
Based on couriers choosing on price. Then it will be calculated by sender / reciever if they want to get package faster or cheaper.
Yes but can it be created on bitcoin Layer2? Do they have some type of smart contracts that allow this?

Hello Bitcoiners,

I’d like to share an idea for a new project that aligns with Bitcoin’s core principles of decentralization, trustlessness, and privacy. This concept envisions a Decentralized Courier Network that could evolve into a Decentralized Marketplace, all powered by Bitcoin.

The Concept:

1. Decentralized Courier Network

• A blockchain-based database connects people willing to act as couriers, enabling them to earn Bitcoin by transporting packages from point A to point B.
• If no direct route exists, the system dynamically calculates alternative paths (e.g., A → C → B), chaining multiple couriers together.
• Couriers lock Bitcoin as collateral equal to the package’s value for the duration of their leg of the journey, ensuring accountability.

2. Trustless Package Transfers 
   

• Each package handoff is verified using **secret codes** shared only with the intended recipient.
• Couriers don’t know whether the recipient is another courier or the final destination, ensuring anonymity and preventing tampering.

3. Decentralized Marketplace (Future Goal)

• This courier network would lay the groundwork for a marketplace where users can list goods or services for sale.
• Announcements and listings would operate via an app running directly on Bitcoin’s network—no websites, no centralized servers.

Why This Matters:

- Empowerment: Anyone can become a courier, earning Bitcoin while going to work, avoiding more CO₂ emissions.
- Anonymity: Pseudonymous operations protect user privacy at every step. 
- Global Access: This system can bypass traditional borders and logistical barriers. 
- Trustless System: Bitcoin collateral and cryptographic verification ensure accountability without the need for intermediaries. 

Feedback Wanted:

This is a starting idea, and I’d love to hear your thoughts on the following: 
- How can we best implement the decentralized database for couriers? Ordinals might be too expensive. What cryptographic techniques would be most effective for package handoffs?
- Are there existing tools or frameworks that could simplify integrating Bitcoin payments and timelocks, smart contracts for allowing verifiability? Can we do this with Lightining and RBF alone?
- What are the potential challenges and opportunities in building a decentralized marketplace on Bitcoin?
- What features or considerations would you like to see prioritized?
- How can we ensure the recipient doesn't mark the item as damaged? Can we implement some sort of slashing system? Like nodes that verify the contract and decide how much damage there is to the package, if it matches description...?

How You Can Help:

- Share your feedback and ideas in this thread.
- Suggest tools, frameworks, or concepts that could bring this vision to life.
- Let’s brainstorm ways to overcome technical and logistical challenges together.

This project is at the idea stage, and I'm not a good programmer. With input from the community, we can turn it into a reality. Let’s work together to create a trustless, decentralized system for shipping and trade that reflects Bitcoin’s ethos. 

Looking forward to your thoughts!

Ciao, potreste aggiungere anche una guida sui migliori portafogli di bitcoin