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Blink: Fast-tracking the Future of Crypto Transactions

Blink: Fast-tracking the Future of Crypto Transactions

25 March 2020Admin

Disclaimer: At the time of writing, Oxen was known as The Loki Project — this piece has been updated to reflect this name change

Cryptocurrencies are seen as the future of financial transactions — and we feel that privacy coins like $OXEN are an important step for cryptocurrencies. Privacy coins maintain fungibility through anonymity, while also providing the security and privacy benefits of traditional cryptocurrencies.

But there’s one little problem: Anonymous crypto transactions are slow.

One step forward…

The decentralised nature and trustless architecture of many cryptocurrencies — and privacy coins in particular — provide users with the peace of mind that there is no central authority which could steal, misuse or abuse their funds.

But the structure of blockchains, and particularly anonymous blockchains, introduces some limitations in terms of how quickly a transaction can be confirmed as valid — and therefore, how long it takes to send or receive crypto.

For example, traditional Bitcoin transactions can take more than 10 minutes. Not very futuristic — especially when credit or debit card transactions are effectively instant, limited only by internet connection speeds.

There are a number of reasons for the long wait times, but in a nutshell, a traditional crypto transaction can only be confirmed (made irreversible) once it’s pulled from a pool of waiting transactions (the mempool) and included in a validated block which is added to the blockchain ledger.

Cryptocurrencies have a fixed ‘block time’ (the time for a new block to be validated and added to the blockchain). At minimum, you will need to wait for the next block of transactions to be validated before your transaction can be confirmed. And depending on how many transactions are being made (and how many transactions are included in a block), you may have to wait a few blocks, which can mean minutes or hours of wait time.

Slow transaction times have long been one of the biggest barriers to using crypto for real-world point-of-sale transactions — and for users wanting secure, anonymous, private transactions, it seemed like this would always be the case.

Some cryptocurrencies have made compromises to attempt to minimise transaction delays, meaning that some transactions can be confirmed in ‘just’ 5-10 seconds — but none of these speedier cryptos can offer the same level of anonymity $OXEN does.

What makes anonymity so important, exactly? Well, without anonymity, cryptos are missing a key component of traditional currencies: Fungibility. Fungibility is the guarantee that any two units of equivalent value will always be interchangeable. Fungibility is basically the law of equivalent exchange: currency is useless if you don’t have a guarantee that you can exchange the currency you have for things of an equivalent value.

In a non-anonymous blockchain, it is possible to trace a specific unit of crypto and identify specific transactions it has been involved in, which creates a number of barriers to crypto being used for everyday transactions.

But why should you care? Well, think about everything you buy — laundry powder, vibrators, and everything in between. Now imagine if anyone who came into contact with the money you spent on that stuff could find out exactly what you bought with it. Weird, right? That’s non-fungible currency in a nutshell — it’s a huge privacy risk.

Most cryptocurrencies can’t guarantee fungibility because specific coins (or fractions of coins) can be traced and tracked. And anonymous cryptos, like those built on the CryptoNote protocol, maintain fungibility through anonymising transactions — but at the cost of long transaction times.

However, $OXEN is uniquely positioned to solve this problem. The Oxen privacy suite is built on our network of service nodes — full blockchain nodes that provide innovative services above and beyond simply validating the $OXEN blockchain. We’ve leveraged the service node network to solve the problem of secure, private, anonymous crypto transactions. This new payment mechanism will be instant, secure, and private.

We call it Blink.

The missing (B)link

Blink transactions can be sent, confirmed and received almost instantly — without having to wait for your transaction to be validated by its inclusion in the blockchain. And, using the Oxen Service Node network, we can do this without compromising on the privacy, anonymity, and security $OXEN is known for.

So how does it work?

A normal, non-Blink $OXEN transaction is sent to the pool of unconfirmed transactions, selected for inclusion in a new block, then validated and added to the $OXEN blockchain. While this may take only a minute or two, it could take much longer:


Compare this to a Blink transaction, which adds a few extra steps to the procedure — but becomes near-instant in the process:


When a $OXEN wallet submits a Blink transaction to the OXEN network, the transaction doesn’t go straight to the pool of unconfirmed transactions. Instead, it’s sent to two separate groups of ten randomly selected Oxen Service Nodes. These groups, known as ‘quorums’, independently check the transaction against existing transactions in the blockchain and the pool of transactions waiting to be confirmed.

If the Blink transaction is invalid or malicious — e.g. a duplicate of a previous transaction, or an attempt to spend $OXEN which does not belong to the sender — the transaction is denied. If it passes all the checks by both quorums, the transaction is confirmed. The sender and receiver see the confirmation, and the Blink transaction is then passed to the pool of transactions waiting to be added to the blockchain.

Blink transactions are confirmed in a matter of seconds, making them as fast as traditional electronic transactions using a credit or debit card — but with all the security and privacy benefits of a normal $OXEN transaction.

For a closer look at the technical details of the Blink transaction mechanism, check out Blink on Oxen Docs.

Blink transactions do have a slightly higher fee attached (5x more than the normal $OXEN transaction fee) to account for the increased network load created by instantly validating the transaction.

Normal $OXEN transaction fees are dynamic, increasing or decreasing depending on how busy the network is. These fluctuations can result in corresponding changes in Blink transaction fees. However, even at their highest, Blink fees will amount to only a few cents — well worth it for the convenience of instant, private, and secure crypto transactions.

Most crucially, Blink is the first implementation of instant transactions for CryptoNote-based privacy coins.

CryptoNote is the leading standard in truly private cryptocurrencies. CryptoNote is used by a number of cryptos, including Monero, Bytecoin, and — of course — $OXEN.

We think Blink is a huge milestone for CryptoNote privacy coins and the crypto community at large.

The future is now

For years, we’ve been hearing that cryptocurrency is the future. But slow transaction times and lack of fungibility, among other factors, have held crypto back from wide adoption, especially for point-of-sale applications. With Blink, cryptocurrency can be used for real-world, real-time private transactions.

Blink has been available as a $OXEN transaction option for a while, but we’re taking it to the next level — as of the Valiant Vidar hardfork, all $OXEN transactions are Blinked by default.

And we’re not done improving, either. There’s more on the horizon for Blink — future plans include enabling re-Blinking (instant re-spending of funds received via Blink), allowing re-Blinked transactions to be merged (simplifying the blockchain), and carrying Blink traffic over the Lokinet onion routing network for added privacy.

The future of crypto is coming.

Blink and you’ll miss it.

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