Bitcoin Forum

I have always thought that internet is always needed to send bitcoin or other cryptocurrencies. It's my first time learning that it could be done offline.

Check this article https://www.cryptovibes.com/crypto-news/bitcoin-transaction-shortwave-radio/

but he is not sending bitcoin! he is sending the private key. it is like giving someone key to your home and to the safe in the wall so that they can go there and take the money you left them there. well that is not sending bitcoin.
additionally he is using shortwave radio so i wouldn't call that exactly "offline", that is just another digital form of transferring data. not to mention this whole thing is super risky since it can be intercepted in the middle.

Not really offline when he just sent the "request" on radio. There's physical bitcoins you can just hand over to people lol.

Offline payments doesn't really sounds like something to explore.

Handing over physical bitcoins is achieving the same purpose as handing over private keys, you're not making any Bitcoin transactions, the coins remain untouched.

Offline payments can be useful, why not? And I think it's already proven possible in many cases, depending on how strictly you want to term "offline", that is! For me, satellite broadcasting the Bitcoin network's pretty good.

Seem to even recall someone on this forum showing how it could be done with smoke signals heh.

It would have been another great feat if this had been truly an offline transfer.

Yeah by just handing over the private key - a transaction can be done in any way you can give information.
If i give instructions to my lawyer to share my private key with my family when i die, i will technically have send bitcoins from the afterlife lol

A lot of strategies are being put in place to make Bitcoin independent of the Internet. <Example : Satellite> because we need  redundancy, when governments wants to shutdown or firewall Bitcoin traffic.

The problem is, people can use Bitcoin without having access to the internet. < Person A can give a physical Paper wallet to person B for payment for something and nobody can stop them >  ;D

It is amazing how the amateurs can do that with a shortwave radio. But, as it was written there, only text was sent from one to the other. How BTC transaction was happened with text left a question in my head.  ???  Also, I doubt that it is safe, so the traditional way looks safer.
On the other hand, as far as I know, there is a new network called Blockstream which is trying to do it professionally and their network is only established for Bitcoin.

Who's going to own the satellite?

So in short if thats me im going to create a new wallet then send the amount you want to that address and give to someone that address (this is how I get it).

Even you can do that transaction offline the receiver will still need to go online to get the money, I cant think of any possible way to make a bitcoin transaction offline it is impossible because if it can be done offline it will be easily hacked by other people and take the amount they want.

Re: Blockstream's Bitcoin Satelite
- https://bitcointalk.org/index.php?topic=2091860.msg49574549#msg49574549

Completely Offline Bitcoin Transactions
- https://medium.com/@notgrubles/completely-offline-bitcoin-transactions-4e58324637bd

Some cool info above. Worth looking into. Looks like it's already a thing.
No internet plan needed to handle transactions.

https://blockstream.com/2017/08/15/announcing-blockstream-satellite/ <--Those guys for example.

A similar feat has been made months ago, using also radio waves as the medium of the said transaction, without any obstructions whatsoever in between the two points. It seems that radio waves are becoming a thing again since most people are curious whether they can deviate from the transactions made with the internet or not. There have been multiple successful attempts now and the technology used for these successful transactions can be used in places wherein internet connectivity is a problem. For now, trials should be refined and pushed further so that it can be taken into commercial use (hopefully.)

maybe sending offline can be done but it's not as fast as online, and obviously this has the risk of being hampered by shipping, I think this is very uncomfortable

There is always a great interest for effective ways to transfer Bitcoin (and the whole cryptocurrency for that matter) since we are visioning a time when there can be a massive disruption on the usual internet system or when there can be a greater power that can suspend the internet so that Bitcoin can still be useful during the time of great crisis. So far all of these are still in the testing and speculative phase so there is nothing yet concrete that this can be done but I am personally hoping that soon this can be a big reality.

There may be other alternative ways t transfer bitcoin from one wallet to another but we cannot think that those ways will always effective and usable like online transactions because one of the very reason why bitcoin was developed in the first place as a digital currency is to provide best features and effectiveness to its users during online transactions but when we consider about offline transactions for many years fiat currencies has build a reputation among everyone so if bitcoin is completely or partially changed to accommodate offline transactions I doubt it can do a considerable change because it is difficult to compete with major fiat currencies

I think wherever the discussion about sending bitcoin offline is still impossible to do, unless Bitcoin has its own network that resembles the internet. But the biggest network in the world today is the internet and there is still no one to like it, and that is not possible for bitcoin

I guess in the near future we might send bitcoin in offline but right now we can't send bitcon in offline. All transactions in blockchain technologies needs to have internet so all tokens that you transfer will be send if you have internet connection.

Not much different than handing over a paper wallet to someone, but it's still amazing that this was done over radio-waves.
I personally don't think that the fact it wasn't an actual transaction, diminishes the achievement in any way.

I'll let this tweet from the guy who did it speak for itself:

https://i.imgur.com/xSp2Uic.png

+1
Very well explained.

The transaction was anyway broadcasted on the blockchain by the receiver. Eventually a person does need to have an internet connection if he wants to broadcast his transaction on the blockchain.
Second thing is that brainwallets are riskier and should be avoided since a slight memory loss could result in loosing your bitcoins forever.

Well, actually in all platform, Blockchain, Game, Internet, and everything that contains Online/Offline thing is always can be fun. But also give some troublesome. And every "Online" activity always use "Request" and "Response" which is the simplest way is by using ping. Different condition (Online & Offline) "Always" give different results. This is why its impossible to create it in offline.

Or do you expect something like temporary cloud services ?
So when we send bitcoin, its only send to the temporary folder to be save the record, and after we connected to the internet, it will just response and we don't need to open the apps/web and send it again ? i think this would make some crash/bug

Actually, this is not possible to sent Bitcoin transaction without internet connection.But I believe in it everything is possible in the world.
when we sent bitcoin form another wallet then they caught those accounts.However, the Internet connection must be held to complete two operations.

I read the article, the sent one is the private key, i dont know if it is safe for the user or not.
But at least, there are some peoples who trying to develop offline transaction in cryptocurrency.
If this thing manage to happened, then we will using bitcoin more easy.

I agree. It is uncomfortable to used bitcoin offline because as you can see even low fees make the transaction lose, what it can do if it is offline. Fast transaction happen when you use internet and it sure going to transfer safer than used offline. I salute those person who are developing this such offline thing it is become successful and work faster without being delay or lose of data.

Sending private keys is the same as sending bitcoin itself because people don't have any ownership to their wallets. They can be passed on easily to anyone else

That isn't really sending Bitcoin because it isn't a transaction, he sent a private key. That's like sending him a wallet and letting him take as much money as he wants. It did work, but if you would like to send a certain amount of Bitcoin, you would have to make another wallet, send that amount there and then send the private key. It is technically possible, but it's unnecessary complicated, just use the internet, it's available everywhere.

Actually, I have heard for a long time that bitcoin can be sent online using radio frequencies where we only need devices that support radio frequency and we can make transactions without using the internet network, of course, this is very good in areas that have not been touched by the internet network.

its not 100% offline sending, it just make a request, after you online and connected to the internet, the request will executed. so it should need the internet to send a transaction, receive the transaction, or update the balance.

How come could use bitcoin for sending or receiving without use internet, I think impossible we can sent bitcoin to other wallet without have support from internet, we need fast internet access for sending and receiving bitcoin from one wallet to other wallet, so far bitcoin or altcoin platform do not have way how could sent bitcoin or altcoin without use internet or by using offline.

as well as eth and eth platform tokens can now send offline
myetherwallet already supports offline sending which is very helpful if the internet goes out in my area

I can tell this is not an offline transaction to be call.
But this is a good addition in sending BTC to someone or anyone.
Sending bitcoin or cryptocurrency will be still at online payment as we are depending on blockchain and we need the net to do that.
In time i hope we can reach thata goal and development/

I did it on a computer that didn't have the internet and did the transaction, absolutely no need for internet and this is an excellent technology. i read and like this article, SamuelPat Sam Patterson Are you this person?
 

If the intended delivery is private keys and not BTC
As well as the use of short radio waves
The inevitable result is to facilitate access to new sectors and this is an achievement.

It is a great achievement. Still a work in progress I guess.  Better than no possibility of sending offline.
What is the price of the hardware for the offline transaction? I think everyone shoud  be able to afford it.

you are confusing offline transactions with cold storage (or offline signing). what these tokens and MEW,.. offer is the later. and it is a part of security measure to prevent your private keys from leaking if you are on an infected computer by moving everything secret to an always offline computer which has no connection to the rest of the world.

If we can really send bitcoin through offline we can truly use it in different kind of transactions. I think if this happen even a small store will start to accept bitcoin because we do not need any internet connection to send our payment. Do you think in the future it will truly happen where we can send bitcoin through offline?

sending bitcoin offline, this is great achievement for bitcoin. It goes to show bitcoin will indeed change the way transactions are made all across the globe, with this one can send money with or without internet at the comfort of his or her home

if bitcoin can be sent offline, it will really boost its usage as it will make so many users become comfortable using it especially those in remote places who really dont have much access to internet. This will indeed boost the use of bitcoin for all kinds of transactions including market places.

It maybe we can experience it sooner but for now, it is something impossible as we all know that digital currencies are design for online transaction.
Making a way for huge development and we are still looking for the better of crypto use and with indefinite time we could see changes in the future if we all keep supporting these.   

I'm pretty sure that there has been previous attempts at this as well, like sending BTC via SMS or some form of transponder that doesn't utilise 3G.

Personally I don't think that these will be significantly used in the future given the widespread use of the internet, even in remote regions now. But these non-internet based developments could certainly be useful as a backup for if somehow the electricity grid completely fails (unlikely to begin with), or potentially, sending BTC in space.


Exactly. And that still requires a degree of trust given that both the sender and receiver can take out coins from the address at any time, and accuse the other of fraud. That's the thing that needs refining, as well as the security aspect of brainwallets.