Frequently Asked

Have questions about what blockchain technology is and what Sky Republic innovations can do for your enterprise? We’ve got the answers:


What is blockchain?

Blockchain is a category of software that manages assets and transactions for a network of participants. It distributes a ledger of processed transactions so participants can stay in sync on the state of the assets. Transactions are sequentially grouped and communicated by block. Each block is chained to the previous block, and immutably recorded across the network of participant nodes, using cryptography and a consensus mechanism.

Blockchain platforms add value by creating trust among participants through a digital consensus on transactions and asset states. But that is probably all what blockchain platforms have in common. They are many kinds focusing on different use cases.

What is a consensus?

Consensus is a distributed algorithm run by the nodes of a blockchain network to generate, exchange, and verify the distributed ledger. It secures the network, allows participants to verify and account for the transactions, and guarantees that they all have identical views on the state of the assets.

That said, consensus algorithms in use can be very different and tailored for the kind of blockchain they power. The main algorithms are Proof of Work (known for consuming a lot of energy), Proof of Stake, and Proof of Authority. (See Wikipedia for definitions). Atlas uses Proof of Notarization, which adds smart contracts and electronic signatures to Proof of Authority. For more detail, please see our whitepaper.

What are the main kinds of blockchain?

The two main categories of blockchain are cryptocurrency, or public, blockchains and enterprise, or permissioned, blockchains.

Cryptocurrency/Public Blockchains

  • Examples: Bitcoin and Ethereum
  • Use case: Decentralized management of digital cash
  • Principle: Digital currency platform that operates independently of a central bank to regulate the creation of currency units and the transfer of funds
  • Network: One global instance, anonymous, open, and decentralized
  • Consensus: Proof of Work or Proof of Stake

Some participants in the network, called miners, compete to validate transactions and generate blocks for a reward in coins. The first miner who gives a valid Proof of Work for a valid block wins a reward. Proof of Work is a solution to a cryptographic puzzle, solvable only by brute force. The problem is adjusted permanently to take a significant amount of time and energy, even with specialized hardware. Blockchain immutability is guaranteed if no one has 51% of the computing power within the network, which is necessary to alter previous blocks and recompute related Proofs of Work before a new block is added. Participants only consider the longest chain of blocks.

Enterprise/Permissioned Blockchains

  • Examples: Hyperledger Fabric, R3 Corda, and Sky Republic Atlas
  • Respective use cases: Distributed databases, distributed workflows, and enterprise-grade smart contracts
  • Principle: Business platform to manage assets and/or automate transaction workflows
  • Network: One instance per community, which is permissioned, confidential, and governed

Consensus: Proof of Authority or Proof of Notarization
Some participants in the network, called notaries, validate transactions and produce the ledger using digital signatures. A standardized digital electronic signature is legally enforceable, where the identity of the signer is proven by a digital certificate. By signing the ledger, notaries prove their identity, ensure blockchain immutability, and engage their liability.

Is blockchain slow?

Cryptocurrency platforms using Proof of Work consensus are slow.

Enterprise blockchains using permissioned networks are fast and target throughput and latency delivered by current transactional systems.

Does blockchain consume a lot of energy?

Platforms using Proof of Work consensus are energy intensive. Enterprise blockchains are not, because the digital or electronic signatures used to certify the validity of blocks are nearly instantaneous.

Does blockchain improve cybersecurity?

The answer is yes from an architecture perspective, as platforms usually implement a decentralized architecture that improves resilience and a decentralized ledger verification process that automates the detection of any wrongdoing by miners or notaries.

From a cryptography perspective, digital signatures are safe today for business use cases. Claims of quantum proof properties made by cryptocurrencies only apply to the immutability of blocks, as coins are transacted through digital signatures.

Is blockchain only meant to decentralize or disintermediate business?

No. For enterprises, the main value of blockchain is to create consensus on processes and data within ecosystems and decentralize benefits compared to a control tower or SaaS network.

What is Distributed Ledger Technology or DLT?

The term DLT was originally created to include cryptocurrency and enterprise platforms in the same software category. Some enterprise platforms, like R3 Corda, use point-to-point ledgers and, technically, are not real blockchains. This Forrester blog suggests that most enterprises continue to use the term blockchain for the overall industry. DLT tends to be used to qualify enterprise platforms that are not blockchains.

Atlas is both a DLT and a permissioned blockchain.

Can a shared database be used instead of a blockchain?

No. A shared database is never used as a transaction mechanism because participants want control over their transaction records and proper documentation in case of litigation.

With a shared database, users cannot verify changes made by others or control availability. Classically, enterprises transact via peer-to-peer messages and keep copies of them. Using electronic signatures, these messages become legally enforceable and non-repudiable, which creates trust between trading partners.

Blockchains and DLTs, including Atlas, process transactions on a distributed architecture with no single point of failure and distribute records through a ledger than can be stored separately by participants.

Why is blockchain is better than EDI or API messaging?

Point-to-point messaging through EDI or API creates fragmentation and scatters processes and data among participants. DLTs usually focus on defragmenting processes OR data. Atlas defragments data AND processes, while also automating their reconciliation. Supply chain ecosystems can then easily track and trace assets, automate processes end to end, and enable comprehensive digital transformation.

What is a notary?

A notary is an organization in charge of verifying transactions and producing ledger entries for an enterprise blockchain network. A notary may or may not oversee the network’s governance (membership, operation support, maintenance, upgrades, etc.).

Is blockchain difficult to govern?

Decentralized networks face technical governance challenges because nobody is in charge. Enterprise blockchains can be operated by a single entity or a consortium of entities. While a consortium approach is powerful for designing new solutions, the operation of a network is simpler and safer when only one entity is responsible. The infrastructure should be decentralized anyway to ensure business continuity.

With Atlas, a single notary can safely operate a network for its participants, thanks to the Proof of Notarization consensus algorithm (see the Atlas whitepaper).

What is a smart contract? What is a Sky Contract?

A smart contract is a packaged piece of code that implements the terms of an agreement between a group of parties. Most of the time, this agreement must also be formalized in a traditional contract to be legally binding and enforceable. The code runs on a ledger that is distributed across a blockchain network. It allows each party to automate transactions, synchronize on the state of its terms and related assets, verify proper execution, and protect itself from tampering by miners or notaries.

Atlas uses an enterprise-grade smart contract—purpose-built for supply chains—called Sky Contracts.

What is a smart app? What is a Sky App?

A smart app is a dApp (blockchain terminology) or composite application (middleware terminology) that runs natively on a blockchain node. It automates the business logic of a participant, which can transact through smart contracts, store private assets, and integrate and reconcile back-end applications.

Atlas uses enterprise-grade smart apps called Sky Apps.

What is an event?

An event is any business or technical change that has significance for a blockchain network and should be identified and/or recorded. The issuance of a purchase order, a temperature threshold being met, a change in an existing document, a flight being delayed, a change of custody for a shipment, or an asset transaction are all examples of events.

Should I wait for blockchain standards?

Nearly all established EDI and IT standardization bodies have started initiatives on blockchain. Some industry specific consortia are very active, like BiTA (Blockchain in Transport Alliance) and the SITA Blockchain Alliance. Looking back at the time it took for EDI standards to be established, most enterprises are leveraging blockchain benefits right now, while following the evolution of potential standards for future compliance.


How is Atlas different from other DLTs and Blockchains?

Atlas eliminates process, data, and records fragmentation and automates digital supply chains through purpose-built smart contracts called Sky Contracts. Sky Contracts have distributed copies that are reconciled through permissioned blockchains, which are replayed by participants to establish consensus.

Atlas was built from the ground up to provide the best features of Ethereum, Fabric, Corda, and middleware in an easy to use and cost-effective, event-driven platform.

What is Atlas consensus algorithm?

Atlas strengthens the Proof of Authority used by other enterprise DLTs by adding the replay of smart contracts and standardized digital signatures with digital certificates. This is called Proof of Notarization and detailed in our whitepaper.

Does Atlas use standardized digital signatures?

Yes. Atlas supports the latest standards (NIST, eIDAS, etc.) and participants can choose the certificate authority of their choice.

Why is Atlas called an event-driven blockchain?

Atlas is capable of processing and distributing events to appropriate recipients automatically and securely, inside and outside a blockchain network. Because relevant business events are pushed automatically, recipients do not have to query the blockchain to retrieve them. Events can easily be created and processed by Sky Contracts and Sky Apps. The persistence and integrity of events is guaranteed by the blockchain nodes, without loss or duplication.

Atlas’s event-driven design significantly reduces total cost of ownership in build and run phases.

What is a choreography process?

A choreography process implements an ecosystem’s business logic. It tracks and verifies the interactions between different entities in a business ecosystem. It can automate certain steps and manage data and assets, so participants can easily track and trace assets or accelerate processes from end to end.

An orchestration process implements an ecosystem participant’s business logic. It automates an enterprise’s internal tasks and interactions with other entities.

For example, a choreography in a supply chain creates or verifies events between a buyer, a manufacturer, and a carrier to automate the processing of a shipment from order to delivery. Each party would execute an orchestration to process received events, interact with their ERP, and send events back to their partners.

Sky Contracts implement ecosystem choreographies and Sky Apps implement enterprise orchestrations. Using both, Atlas automates and reconciles supply chain ecosystems all the way to each participant’s backend systems (ERP, MRO, TMS, etc.).

What are the benefits of using a relational database?

Supply chain data models can be very complex. A relational database saves significant development and maintenance time to implement queries (Create, Read, Update, Delete, List) on assets, data, and documents within smart contracts and smart apps.

Does Atlas have a native cryptocurrency?

No, but you can create and manage tokens with Sky Contracts.

Does Atlas support cancellations and comply with privacy laws (e.g., GDPR in EU)?

Atlas can coordinate blockchain participants so they can cancel events or suppress information from the network.

When a transaction is cancelled, a cancellation entry is added to the blockchain and a Sky Contract will reverse the impacts of the original transaction in its asset repository. Banks follow the same process than they cancel a charge on an account. The initial charge and its cancellation both appear on the customer’s account statement and the account balance is credited again with the charge amount originally debited.

How do I integrate Atlas?

You can use Atlas connectors or APIs to integrate your applications (ERP, TMS, CRM, MRO, etc.), your middleware platforms (EDI Gateway, API Server, iPaaS, etc.) and other blockchains.

Is Atlas code open source?

Atlas is a commercial platform that provides advanced capabilities to reduce overall total cost of ownership, compared to open source or commercial DLTs.

Altas minimizes build costs through:

  • The native support of relational databases
  • Advanced features such as SubContracts and event delivery notifications
  • An event-driven Software Development Kit that has fewer than 10 verbs in it and is very simple to use
  • Automatic database transaction management, events transmission, and blockchain creation, distribution, and verification
  • A growing library of technical and application connectors

Atlas nodes optimize run costs through a scalable hub architecture, which saves cloud resources and facilitates administration.

Atlas subscriptions include unlimited support.

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