Nano (cryptocurrency)

Nano

Denominations
Symbol| U+04FE Ӿ (HTML `&#1278;`)[lower-alpha 1]
Ticker symbol| XNO[lower-alpha 2] (formerly NANO, XRB)
Previous names| RaiBlocks[1]
Precision| 10−30 (raw)
Development
Original author(s)| Colin LeMahieu
White paper| "Nano – Digital money for the modern world"
Initial release| 4 October 2015 (10 years ago) (2015-10-04)
Latest release| V25.1 "Daric" / 2 June 2023 (3 years ago) (2023-06-02)
Code repository| github.com/nanocurrency
Development status| Active
Written in| C++
Developer(s)| Nano Foundation
License| FreeBSD
Website| nano.org
Ledger
Timestamping scheme| "Open Representative Voting", a form of proof-of-stake
Hash function| Blake2
Issuance schedule| Captcha faucet (ended 20 October 2017; 8 years ago (2017-10-20))
Supply limit| 133,248,297

1. ↑ Approximation of two-stroke "X"
2. ↑ Compatible with ISO 4217, though is not approved

Nano (Abbreviation: XNO; sign: Ӿ) is a cryptocurrency characterized by a directed acyclic graph data structure and distributed ledger, making it possible for Nano to work without intermediaries. To agree on what transactions to commit (i.e., achieving consensus), it uses a voting system with weight based on the amount of currency an account holds.[2][3]

Nano was launched in October 2015 by Colin LeMahieu to address the Bitcoin scalability problem and was created to reduce confirmation times and fees.[4] The currency implements no-fee transactions and achieves confirmation in under one second.[5]

## Contents

* 1 History
* 1.1 BitGrail hack
* 2 Design
* 3 See also
* 4 References

## History

Colin LeMahieu started the development of Nano in 2014 under the name "RaiBlocks".[1][6] A year later, RaiBlocks was distributed for free through a captcha-secured faucet.[7] In 2017, after 126,248,289 RaiBlocks were distributed, the faucet shut down. This fixed the total supply to 133,248,297 RaiBlocks, after addition of a 7,000,000 RaiBlocks developer fund.[8]

### BitGrail hack

On February 9, 2018, an Italian cryptocurrency exchange BitGrail announced its hack and eventual shutdown.[9] Users were prevented from accessing assets stored on the platform, which was collectively worth 17 million Nano.[10] The victims then launched a class-action lawsuit against BitGrail owner Francesco Firano for recoupment, inside the Florence Courthouse. The exchange was ruled to be guilty in January 2019, as it was found to fail at implementing safeguards and reporting losses.[11] The Italian police branch Network Operations Command (Italy) alleged the Bitgrail founder had conducted fraud.[12] Nano prices had been around $10 prior to the hack and after the hack fell to $0.10.[13]

## Design

Nano uses a block-lattice data structure, where every account has its own blockchain for storing transactions.[14][15] It is the first cryptocurrency to use a directed acyclic graph data structure,[16] by having a "block" consisting of only one transaction and the account's current balance.[17][14]

Consensus is reached through an algorithm similar to proof of stake.[18] In this system, the voting weight is distributed to accounts based on the amount of Nano they hold; accounts then freely delegate this weight to a peer (node) of their choice.[19]

If two contradictory transactions are broadcast to the network, indicating a double-spend attempt, nodes will vote for either transactions. Afterward, they broadcast their vote to the other nodes for strictly informational purposes. The first to reach 67% of the total voting weight is confirmed, while the other transaction is discarded.[20][non-primary source needed]

## See also

* IOTA (technology)

## References

1. ↑ 1.0 1.1 Baldwin, Rosecrans (2019-11-26). "Cryptocurrency Will Not Die ". GQ. Retrieved 2020-12-22.
2. ↑ Hrga, Alen; Capuder, Tomislav; Podnar Žarko, Ivana (2020). "Demystifying Distributed Ledger Technologies: Limits, Challenges, and Potentials in the Energy Sector". IEEE Access 8: 2169–3536. doi:10.1109/ACCESS.2020.3007935.
3. ↑ Bencic, Federico Matteo; Podnar Zarko, Ivana (2018). "Distributed Ledger Technology: Blockchain Compared to Directed Acyclic Graph". 2018 IEEE 38th International Conference on Distributed Computing Systems (ICDCS). pp. 1569–1570. doi:10.1109/ICDCS.2018.00171. ISBN 978-1-5386-6871-9.
4. ↑ Easley, David; O'Hara, Maureen; Basu, Soumya (2019). "From mining to markets: The evolution of bitcoin transaction fees". Journal of Financial Economics 134: 91–109. doi:10.1016/j.jfineco.2019.03.004.
5. ↑ Morais, Rui; Crocker, Paul; Melo De Sousa, Simao (2020). "A Tool for Implementing Privacy in Nano". 2020 IEEE International Conference on Decentralized Applications and Infrastructures (DAPPS). pp. 159–163. doi:10.1109/DAPPS49028.2020.00021. ISBN 978-1-7281-6978-1.
6. ↑ Github (2014-05-01). "[1] ". Github. Retrieved 2022-21-09.
7. ↑ Bottone, Michele; Raimondi, Franco; Primiero, Giuseppe (2018-07-23). "Multi-agent Based Simulations of Block-Free Distributed Ledgers" (in en). 2018 32nd International Conference on Advanced Information Networking and Applications Workshops (WAINA). Krakow, Poland. pp. 585–590. doi:10.1109/WAINA.2018.00149. ISBN 978-1-5386-5395-1. https://doi.org/10.1109/WAINA.2018.00149. Retrieved 2022-02-11.
8. ↑ Wall Street Journal (2018-03-03). "Crypto Investing Comes With a Big Risk: The Exchanges ". Wall Street Journal. Retrieved 2022-09-23.
9. ↑ Morris, David (11 February 2018). "BitGrail Cryptocurrency Exchange Claims $195 Million Lost to Hackers" (in en). https://fortune.com/2018/02/11/bitgrail-cryptocurrency-claims-hack/.
10. ↑ Vigna, Paul (2018-02-10). "Cryptocurrency Worth $170 Million Missing From Italian Exchange ". The Wall Street Journal. Retrieved 2019-12-18.
11. ↑ Canellis, David (2019-01-28). "Italian court forces BitGrail CEO to repay $170M in 'lost' cryptocurrency ". The Next Web. Retrieved 2019-12-18.
12. ↑ "Italian police accuse cryptocurrency exchange boss of huge fraud" (in en). 21 December 2020. https://www.reuters.com/article/italy-cyber-cryptocurrency-idUSL8N2J127X.
13. ↑ Hatmaker, Taylor (12 February 2018). "Italian cryptocurrency exchange gets hacked for $170 million in Nano" (in en). https://techcrunch.com/2018/02/12/bitgrail-hack-nano/.
14. ↑ 14.0 14.1 Shahaab, A.; Lidgey, B.; Hewage, C.; Khan, I. (2019). "Applicability and Appropriateness of Distributed Ledgers Consensus Protocols in Public and Private Sectors: A Systematic Review". IEEE Access 7: 43622–43636. doi:10.1109/ACCESS.2019.2904181.
15. ↑ Xiao, Y.; Lou, W.; Thomas Hou, Y. (2020). "A Survey of Distributed Consensus Protocols for Blockchain Networks". IEEE Communications Surveys & Tutorials 22 (2): 1432–1465. doi:10.1109/COMST.2020.2969706.
16. ↑ Masood, Faraz; Faridi, Arman Rasool (2018). "Consensus Algorithms in Distributed Ledger Technology for Open Environment". 2018 4th International Conference on Computing Communication and Automation (ICCCA). pp. 1–6. doi:10.1109/CCAA.2018.8777695. ISBN 978-1-5386-6947-1.
17. ↑ Werner, Robert et al. (2020). "Anonymization of Transactions in Distributed Ledger Technologies". Twelfth International Conference on Adaptive and Self-Adaptive Systems and Applications. p. 69. ISBN 978-1-61208-781-8.
18. ↑ Mercan, Suat; Kurt, Ahmet; Erdin, Enes; Akkaya, Kemal (2021). "Cryptocurrency Solutions to Enable Micro-payments in Consumer IoT". IEEE Consumer Electronics Magazine 11 (2): 97–103. doi:10.1109/MCE.2021.3060720.
19. ↑ Khalifa, Amr; Bahaa-Eldin, Ayman; Sobh, Mohamed (2019). "Blockchain and its Alternative Distributed Ledgers - A Survey". 2019 14th International Conference on Computer Engineering and Systems (ICCES). doi:10.1109/ICCES48960.2019.9068183.
20. ↑ Nano. "Protocol Design - ORV Consensus". https://docs.nano.org/protocol-design/orv-consensus/.

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