This is part of "Blockchain Decoded," a series looking at the impact of blockchain, bitcoin and cryptocurrency on our lives.

These days, we're having a harder and harder time trusting each other.

Trust is an essential part of ordinary living, whether it's picking mechanics based on Yelp reviews, sliding credit cards into gas station fuel pumps or heeding our doctor's advice. But our trust has been eroding for years. In the US, only 33 percent of us felt we could trust our government in 2017 -- a decline of 14 percentage points from 2016, according to Edelman's annual trust barometer study. Trust in businesses dropped from 58 percent to 48 percent, too, while media (fake news!) and social networks also took a hit.

That's a problem. The less trust you have, the harder everything becomes. Did that job candidate really graduate from college? Did your brother-in-law really repay that loan?

But there's an unlikely solution that might help restore enough faith in strangers to make our lives a bit easier: an encryption technology called blockchain.

Blockchain is best known as the technology behind the cryptocurrency bitcoin -- a digital currency whose value soared above $19,000 over the last year before slumping to half that when the frenzy subsided. But blockchain is so much more, potentially easing the doubts and uncertainties that dog so much of life -- whether buying a used car from a stranger, having faith that a piece of fruit really is organic or knowing that a prescription drug isn't counterfeit. Blockchain, in effect, hard-wires trust into transactions or data that we might otherwise be more cautious about.

"It's revolutionary," said Mark Siegel, an investor at Menlo Ventures.

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Bitcoin's value has soared and plunged over the last year, and it's hard to separate the sensible from the scams among the 1,500 other cryptocurrencies. But blockchain has enjoyed more stable appeal.

Indeed, staid companies like IBM, Microsoft and Intel are offering blockchain as just another software tool to get business done. Other companies dabbling in blockchain include Goldman Sachs, Nasdaq, Walmart and Visa.

Because blockchains work as a secure digital ledger, a bumper crop of startups are hoping to bring it to voting, lotteries, ID cards and identity verification, graphics rendering, welfare payments, job hunting and insurance payments.

A lot of that revolution could be invisible to you, taking place inside and among businesses. But it's potentially a very big deal. Analyst firm Gartner estimates that blockchain will provide $176 billion in value to businesses by 2025 and a whopping $3.1 trillion by 2030.

How does blockchain actually work?

OK, strap yourself in, because this gets a bit hairy.

A good place to start is the name: a blockchain is an ever-growing set of data blocks. Each block records a collection of transactions -- for example, that you now hold the title to the car you bought or that you paid a car dealer to get it.

Maersk

That may sound simple, but here's a difference between blockchain and the Department of Motor Vehicles. Today, the government stores the information on its own central computer. Blockchains, though, distribute it across a group of computers -- maybe even thousands of them. Each has its own copy of the blockchain transactions.

That decentralization and synchronization means no single party controls the data. If one business sells an asset to another, each sees the same data. There's no need for lawyers at one company to call the other if their accounting databases disagree, because there's only one accounting database.

Cryptography -- mathematical methods of keeping data secret and proving identity -- now enters the picture when it comes to recording transactions. Blockchain uses the same cryptographic key technology that keeps hackers from sniffing your credit card number when you type it into an e-commerce website. One digital key ensures only you can enter a transaction to the blockchain involving your assets, and another digital key lets someone else confirm it really was you who added the transaction.

"You can take a network of parties that didn't have prior experience working with each other -- that didn't have reason for trust -- and still find a way to build a transaction record or a history of the truth," said Brian Behlendorf, executive director for the Linux Foundation's Hyperledger project for blockchain software.

Indelible ink

Another fundamental part of the blockchain is called immutability -- its resistance to tampering or other changes. To understand it, you need to understand another cryptographic concept called the hash.

Hashing reduces data to a bunch of seemingly random characters -- for example, the hash of the phrase "the quick brown fox" is "9ECB36561341D18EB65484E833EFEA61EDC74B84CF5E6AE1B81C63533E25FC8F" using an encoding method called SHA-256. Tweaking just one letter in the phrase produces a completely different hash, and you can't go backward to figure out the original data from the hash.

With blockchain, hashes are linked together so any minute change is immediately visible, not just for the block housing it but for all other blocks added later. With red flags that big for changes that small, you can see why auditors would get excited.

"It's like doing the crossword puzzle in ink instead of pencil," said Marie Wieck, head of IBM's 1,500-employee blockchain group. "You will see if you change your answer to 3 across from moon to star."

That's no fun for embezzlers accustomed to hiding behind dodgy or altered records. Cryptocurrencies can offer anonymity to criminals, which is why it's been popular for things like the WannaCry ransomware that locked up people's computers until they paid up. But blockchain makes it easier to find the digital scene of the crime -- especially with private blockchains that networks of business partners can set up to cooperate.

Mining madness

The process for locking down a block onto the blockchain so it can't be changed, at least today, is called mining.

And it's a problem.

Here's how it works. When you and others announce transactions to a blockchain network, computers on that network race to solve a complicated mathematical puzzle based on those transactions. A computer that succeeds announces it to the network, and the transaction is accepted if other computers verify that none of the assets in question were already used. That's what'll keep you from selling the same concert ticket twice on a blockchain-based ticket market. (Citizen Ticket and Active Ticketing are working on this.)

Bitmain

But today's mining approach, called "proof of work," has huge drawbacks.

For one thing, mining works most profitably on powerful computers that consume immense amounts of electrical power. For example, bitcoin mining today uses about as much power as the country of Singapore, enough to power 4.4 million houses, according to cryptocurrency analyst firm Digiconomist. That amount is growing.

For another, transactions are relatively slow. Blockchain transactions can race past transactions that rely on middlemen and reconciliation procedures, like escrow accounts for home purchases or international money transfers. But bitcoin transactions can take about 10 minutes, which is why cryptocurrencies today aren't useful for just buying something in a store.

There's lots of work to free blockchain from the problems of transaction speed and energy consumption, though. One idea, "proof of stake," uses no significant computing power and looks to be the future for the Ethereum Project, which is responsible for the ether cryptocurrency.

If bitcoin was the first generation of blockchain and Ethereum the second, there are a number of people hoping their project will catch on as the third.

Tezos, for example, hopes to build in better governance so its technology can move forward without the troubles bitcoin and Ethereum have suffered, said Tezos CEO Kathleen Breitman, speaking at the Techonomy conference in November -- though ironically, Tezos has suffered governance problems of its own with a spat over its own management. Another challenger is Dfinity. Its chief scientist, Dominic Williams, promises transaction speeds 600 times faster than Ethereum, which today is only a bit faster than bitcoin.

Smart contracts

The original blockchain was described in a 2008 bitcoin paper by Satashi Nakamoto, a pseudonym for a person or perhaps group that unified some ideas into the first working cryptocurrency. The idea became reality with the release of open-source bitcoin software in 2009. The bitcoin blockchain now records about 300 million transactions and counting.

But ether has popularized a newer idea called smart contracts. These are programs that run on the Ethereum network and take automated if-this-then-that actions. For example, a smart contract could look for the highest bid in an auction at a certain time and automatically transfer ownership rights to the auction winner.

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"When companies sign a contract, it's enforced by a judge or lawyers in a court," said Vipul Goyal, an associate professor in Carnegie Mellon University's cryptography group. "Smart contracts are enforced by cryptographic mechanisms in the code. Enforcing the contract is much cheaper and much faster -- almost instant."

With smart contracts, blockchain could help automate lots of computing operations, including ones humans never touch. Your electric car could wait for favorable electricity prices before deciding when to charge itself from the grid, solar panels or in-home batteries, then the blockchain could handle accounting among all the parties.

Goyal expects blockchain will help automate all sorts of transactions. For example, if it's used to register your car purchase, that could trigger a cascade of other operations, like transferring the car's cryptographic keys that let its owner unlock the car.

"This is much more efficient than going to the DMV and filling out paperwork," he said. "It's also more secure, because these keys cannot be forged. The seller can't make copies of the key and try to steal the car."

The ties that bind

Expect to see blockchain showing up in particular where there are groups of interlinked organizations. That could include one company and its suppliers, or it could be consortiums of competitors and and their suppliers.

For example, IBM has a blockchain partnership with a long list of food suppliers and grocery retailers, including Dole, Kroger, Nestlé, Tyson Foods and Walmart.

Brave Software

Another blockchain project comes through browser startup Brave, which relies on the technology to change online advertising in a way that improves performance and privacy while giving browser users a cut of the proceeds. Blockchain accounting, using a digital payment mechanism called the basic attention token (BAT), enables direct payments among advertisers, publishers and browser users -- for example an advertiser paying a publisher or a reader making a small one-off payment for a news article without buying a subscription.

It's transparent, so anyone can see exactly how many BATs were transferred and check that Brave didn't illicitly siphon any off, Brave CEO Brendan Eich said.

But for companies averse to sharing data with competitors, blockchain's transparency is a difficulty. There are mechanisms for handling the challenge, Behlendorf said.

"In most networks, you have a balance between data that can be kept private, but enough public that you can attest to its veracity," Behlendorf said.

Another way blockchain could bring many parties together is property records.

There are thousands of counties in the US, each with its own record of who owns what. One startup, Propy, hopes to digitize those records, mirroring the records initially the way title companies do, but also storing them on the blockchain, said CEO Natalia Karayaneva.

If county clerks saw the benefit, they could gradually move to the system -- it's decentralized, not Propy's own database. Propy hopes to profit by taking a percentage of the sales it facilitates, but at the same time, it also hopes to cut purchasers' costs -- for example by eliminating the thousands of dollars that title insurance can cost.

Slow down there a minute

For something as hyped as blockchain, with millions of dollars raised, you have to expect some backlash. There's plenty, starting with the criticism that blockchain would have already taken off if it's so great and concerns that it's abetting cryptocurrency shenanigans. There's also the concern that poorly written code could leave a faulty foundation.

Overinflated expectations are nothing new to the tech industry, though, and there are enough serious players engaged that it's hard to dismiss blockchain as all sizzle and no steak. Expect a winnowing as reality sets in.

"In 2018, we expect to see a number of projects stopped that should never have been started in the first place," said Forrester analyst Martha Bennett.

She points out plenty of other areas where blockchain falls short of its promises. The immutability comes at a cost, lacking some of the mechanisms for recourse found in today's slower processes. Companies cooperating to set up their own private blockchains, rather than using public ones like Ethereum, must have some trust already to set up rules for access and governance.

Here's another hitch: getting everybody on board. The French automaker Renault, for example, hopes for a blockchain to lock down car maintenance records. After all, who wouldn't want to know if the used car you're thinking of buying made lots of trips to the repair shop? It turns out the seller may not share your enthusiasm for that much transparency.

So it's not perfect. But it doesn't have to be. Blockchain just has to be better than what we have today. There are a lot of underhanded cryptocurrency dealings, but regulators are now reining in abuses, said Rick Levin, chairman of the financial technology and regulation team at the AmLaw law firm Polsinelli. Likewise, engineers are hammering out improvements to blockchain and big names like Nasdaq and Goldman Sachs are embracing it.

"I don't think it's just going to vanish," Levin said. "There's too much energy behind this."

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