I thought of it today that if banks have issues with their network, this will certainly bite but people will continue to transact with their paper money. What about bitcoin when there is no internet network?
Soon cash will not exist. Banks and governments around the world have been discussing removing notes/excluding them as legal tender, in order to lock people into the banking system. From here comes chaos. Anyone can be excluded from the economy at the click of a button, and this will probably end in the exponential growth of Bitcoin. I digress from the main point of this topic however...
With this suggested initiative, people can transact even when their gadget is not available. This is a huge issue that got me thinking if there could be possibility of having a note or any tenders in place offline in which the holders can later scan with their gadget and get their value credited when power and internet is later restored. It could be a coded paper or precious material depending on the value of BTC in it.
It might be a huge project in the future, much might not be said of it now and people might think it is not even necessary, but it will do a lot more in adopting it and having more access to it when power and internet is fails.
Your idea is fine however there is a flaw - In order for this idea to work, a central party would need to provide this tender and therefore they would have access to private keys. This would be the equivalent of a custodial wallet.
Or, an open source tool is created to create your tender, which you can then create notes yourself and spend them yourself. The private key being its authenticity. To make this work though, merchants and others who are accepting would need to be able to have a tool that can sweep the private key. The next problem from there, is change. (e.g, I have a 0.01 BTC tender item, though I am buying something worth 0.009 BTC. How do I get the 0.001 BTC change, and what is stopping this amount from being swept by the seller/merchant/receiver too?)
The next issue after that, is the design standard. Since a private key is all that is needed for valid tender, what would this look like? How do people distinguish amounts (as there is nothing stopping all possibilities of design). I suppose Ordinals or NFTs might even be useful here...
Creating an offline option is possible, but not as simple as it seems in theory.