Wikipedia

Algorand

(Redirected from Draft:Algorand (cryptocurrency platform))

Algorand is a proof-of-stake blockchain and cryptocurrency. Algorand's native cryptocurrency is called ALGO.[2]

Algorand
Denominations
SymbolALGO
Development
Original author(s)Silvio Micali
White paperhttps://arxiv.org/abs/1607.01341
https://eprint.iacr.org/2017/454
https://eprint.iacr.org/2018/377
Initial releaseApril 2019
Code repositoryhttps://github.com/algorand
Development statusActive
Written inPython, TypeScript (smart contract programming languages); Go (implementation language)
Developer(s)Algorand, Inc.
Ledger
Ledger startJune 2019
Supply limit10,000,000,000 ALGO[1]

Algorand may also refer to the private corporation based in Boston,[3][4] as well as to the nonprofit Algorand Foundation Ltd., incorporated in Singapore.[5][6][7]

History

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Algorand was founded in 2017 by Silvio Micali, a computer scientist and professor at the Massachusetts Institute of Technology (MIT).[8][9]

Algorand's test network was launched to the public in April 2019.[10]

Following successful testing and refinements, the main Algorand network was officially launched in June 2019.[11] The protocol reached its fifth year in 2024.[12]

Governance

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Algorand Foundation Ltd. manages award funding, cryptographic research, on-chain governance, and decentralization of the Algorand network including nodes. The Algorand protocol specifications are maintained by the Algorand Foundation.[13] The development of the Algorand protocol reference implementation is overseen by Algorand Technologies.[3] The foundation is led by CEO Staci Warden.[14] The foundation also conducts developer programmes, accelerators and other activities in Africa[15] and India.[16]

As of 2024, the Algorand Foundation Ltd. manages the technical development and governance of the Algorand protocol.[17] It is led by CEO Staci Warden.[18]

The foundation also conducts developer programmes, accelerators and other activities in Africa[15] and India.[16]

Algorand Foundation Ltd. issues quarterly votes for the stakes of ALGO to vote on.[19] These proposals include implementation of DeFi.[20][21][22][23]

Design

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Algorand is a single-layer, energy-efficient,[24] quantum-secure blockchain with instant finality.[12] The Algorand blockchain cannot be forked.[25][26]

Consensus algorithm

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Algorand uses a Byzantine agreement protocol that leverages proof of stake,[27][28][29] which contributes to its energy efficiency.[30][31] It is a competitor to blockchains such as Ethereum.[32] Researchers have found its protocol to be highly secure.[33]

Cryptographic sortition

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The core principle of Algorand consensus is the cryptographic "self" sortition. The sortition procedure runs locally and privately, on each node of the network participating in the consensus protocol, without a centralized coordination.[34] The goal of the sortition algorithm is randomly selecting a subset of users participating in the consensus protocol (committees) ensuring two properties: the sortition's result can be easily verified once it is published, while it can not be determined ahead of time by malicious adversaries. The number of selected users in the sortition (committee size) is defined as a statistical expectation on the outcome of a pseudo-random process. The likelihood that a given user will be selected (in the committee) is influenced by the number of ALGO tokens held by that user (the stake).[25][35][36]

Verifiable random function

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The cryptographic sortition implementation relies on the verifiable random function (VRF) cryptographic primitive. The VRF consists of two algorithms: generation and verification. When each user participating in the Algorand consensus protocol runs the VRF, the VRF acts on a safe public seed[37] (Q, system wide parameter, published in past blocks) to generate a uniform pseudo-random number (h), along with a proof (𝜋), using a user's secret key (of a public / secret key pair, Pk / Sk). The result can then be easily and publicly verified (as true or false) using the public seed (Q), the result (h), the proof (𝜋) and the user public key (Pk).

The consensus protocol requires users to generate the VRF key pairs before the safe public seed Q has been agreed, ensuring that the cryptographic sortition is robust with respect to brute force attacks (both on the safe public seed Q and users' secret keys Sk). The cryptographic sortition is also robust with respect to Sybil attacks (splitting users' ALGO tokens in multiple fake users gives no advantage in the sortition).

Consensus steps

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Consensus on Algorand requires three steps to propose, confirm, and write the block to the blockchain.[38] The steps are: block proposal, proposals filtering (soft vote) and committing the block (certify vote). Each step relies on an independent run of the cryptographic "self" sortition, to elect a voting committee with different sizes (statistical expectations on the sortition outcome) and voting thresholds.[39]

Block proposal

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In the first step the cryptographic sortition selects a subset of users (proposal committee) which assemble and propose a block for the next round of the protocol. At the end of the step there will be a few block proposals (the protocol is tuned with a statistical expectation of 20 proposals) with different random priorities. After determining if a user is on the proposal committee, that user can build a proposed block and gossip it to the network for review/analysis during the second phase. The user includes the result of the VRF (h) and cryptographic proof (𝜋) in their block proposal to demonstrate committee membership.[35][36][39]

Proposals filtering

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In the second step the nodes in the networks wait for an adaptive period of time (𝜆), measured by nodes' local clocks, to be sure that the block proposals gossiped in the previous steps have been observed.[39]

A new cryptographic sortition selects a subset of users (soft vote committee) to vote and reach a Byzantine Agreement (called "BA*") on the proposal with highest priority. When users have determined that they are in this second-phase voting committee, they analyze the block proposals they have received (including verification of first-phase committee membership) and vote on the highest priority one.[35][36][39]

Certify block (commit)

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Once a threshold of votes is reached in the previous proposals filtering step, the third and last step of the protocol begins. A new cryptographic sortition selects a subset of users (certify committee) to vote and reach a Byzantine Agreement on the content of the proposed block with respect to the state of the ledger (e.g. the block does not contain double spending, overspending or any other invalid state transition between accounts).[39]

If the certify committee achieves consensus on a new block, then the new block is disseminated across the network and appended to the ledger.[25][40][41]

Within the Algorand consensus protocol, membership in all the committees changes every time a new step is run. This protects users against targeted attacks, as an attacker will not know in advance which users are going to be on a committee.[16] According to an external security audit, the model also accounts for timing issues and adversary actions, e.g., when the adversary has control over message delivery.[42][39]

Recovery

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The Algorand consensus protocol privileges consistency over availability (CAP theorem).[43] If the network is unable to reach consensus over the next step (or block), within a certain time, the protocol enters in a recovery mode, suspending the block production to prevent forks (contrary to what would happen in blockchains based on the "longest-chain principle", such as Bitcoin). The recovery mode of the protocol ensures that the block production resumes immediately, with no need of reconciliations or reorganization, as soon as a Byzantine Agreement is reached again.[39]

Performance

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Algorand's block size is 5 MB. The Algorand network can facilitate 10,000 transactions per second, with less than 3 seconds of block time. Transactions are instantly final due to the Algorand Byzantine agreement protocol.[12]

Virtual machine

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The Algorand Virtual Machine (AVM) is the secure runtime environment for the execution of decentralized applications with instant finality.[44] The AVM is a bytecode-based Turing-complete stack interpreter, with a specific instruction set, that runs on every Algorand node and executes programs (Smart Contracts) associated with Algorand transactions. The AVM has two runtime modes: stateless (execution context based on transactions’ content and current block) and stateful (execution context extended to the ledger state, such as Smart Contract storage, etc.). The AVM reference implementation is written in Go. Algorand Smart Contracts can be written in high level languages, such as Python or TypeScript, via the AVM compiler, which complies them down to AVM bytecode.[45]

The AVM supports common arithmetic and logic operations, byte array manipulation and bitwise operations, cryptographic primitives, branches and flow control instructions, state access and manipulation. The AVM operates up to a 512-bit precision. Algorand Smart Contracts are updatable (optional, if enabled).[45]

Network

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An Algorand network is a distributed system of nodes, each maintaining a local state based on validating the blockchain and the transactions therein. Nodes are spread geographically, communicating with each other over the Internet. The integrity and the consistency of the global network state and distributed ledger is maintained by the consensus protocol. Algorand nodes communicate through message gossiping (broadcasting) either in peer-to-peer or via relay nodes (which facilitate efficient broadcasting with minimal message hops and low latency).[46]

Transaction speed and fees

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The Algorand blockchain can facilitate 10,000 transactions per second. Transactions are instantly final due to the protocol's Byzantine agreement protocol.[12]

Other features

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Algorand is a quantum-resistant blockchain[47] that utilizes FALCON keys selected by NIST. Algorand cryptographers also contribute to FALCON standards and the lattice-based cryptography that FALCON relies on.[48]

In 2024, Algorand Foundation launched an open-source standard for more secure communications between wallets.[49]

ALGO

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The unit of account of the Algorand protocol is the ALGO. The protocol's supply of ALGO is limited to 10 billion units. One ALGO is divisible to six decimal places, the smallest unit is called microALGO (𝜇ALGO), equal to 1/1,000,000 (one millionth) ALGO.[1]

Adoption

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Algorand has been a partner of World Chess since 2019.[50]

In 2021, Italia Olivicola, Italy's largest olive and olive oil producers' organization, partnered with Euranet to implement blockchain technology based on Algorand.[51] SIAE, the Italian Society of Authors and Publishers, also announced a project on copyright management using Algorand in the same year.[52]

In 2022, Algorand's blockchain was used by Robert Irwin and the Australia Zoo for its collectible series of NFTs.[53][54] Caffe Barbera also partnered with Algorand to expand its payments options in 2022.[55]

In 2022, the AP reported that Algorand would be a partner of FIFA ahead of the 2026 World Cup.[56]

In 2023, Italy's 'Fideiussioni Digitali' initiative to reduce fraud in bank and insurance guarantees, selected Algorand as its blockchain.[57]

In 2024, CNBC reported that Algorand's blockchain is being piloted for digital health passports for women in India's informal working sector.[58]

Algorand's blockchain is also used by the Italian roasted coffee company Lavazza for increased traceability of products.[59]

The Algorand blockchain had its first tokenized money market fund launch in June 2024.[60]

According to some studies, Algorand can be used as a suitable blockchain for smart cities,[61] medical records storage,[62] supply chain,[63] election integrity,[64] Internet of Things,[65] retail loyalty programs,[66] higher education credentials,[67] reducing spam phone calls,[68] copyright protection,[69] online marketplaces,[70] water analysis,[71] business processes,[72] among others.

References

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