Secure Private Untraceable Fungible
Digital Cash for High-Confidential Transactions

A Fork From Monero

Sumokoin is forked from the source code of Monero cryptocurreny, one of the most innovative digital coins which is well-known for security, privacy, untraceability and active development, therefore, naturally inheriting all of those great features, yet without the burden of its past


True Fungibility

Sumokoin is one of a few rare cryptocurrencies with true fungibility - the feature makes digital currency act like physical cash i.e. no other people can find where the money comes from and how many have been transferred.


Great Privacy

Sumokoin is created with high level of privacy in mind, setting Ring Confidential Transactions (RingCT) with minimum ringsize (mixin) of 12
to conceal sources/amounts transferred and make it high resistance to blockchain-analysis attacks


Strong Security

Sumokoin utilizes the power of a distributed peer-to-peer consensus network, every transaction is cryptographically secured. Individual accounts have a 26 word mnemonic seed displayed when created, which can be written down to back up the account and account files are encrypted with a passphrase to ensure they are worthless if stolen.

Supply & Emission

  • Total Supply: 88,888,888 coins in first 20 years, then about 263,000 coins (~0.3%) each year for inflation. About 10% (~8.8 million) was premined to reserve for future development*, i.e. over 80 million coins available for community mining
  • Coin Symbol: SUMO
  • Coin Units:
    • 1 Sumoshi  = 0.000000001 SUMO (10-9 - the smallest coin unit)
    • 1 Sumokun = 0.000001 SUMO (10-6)
    • 1 Sumosan  = 0.001 SUMO (10-3)
  • Hash Algorithm: CryptoNight
  • Network Power: Proof-of-Work (PoW)
  • Block Time: 240 seconds (approx.)
  • Maturity: 60 blocks
  • TX Fee: Dynamic (based on TX size and block reward)
  • Emission scheme: Sumokoin's block reward changes every 6-months as the following "Camel" distribution** (inspired by real-world mining production like of crude oil, coal etc. that is often slow at first, accelerated in the next few years before declined and depleted). However, the emission path of Sumokoin is generally not far apart from what of Bitcoin (view charts below) indicating long-term existance and commitment

* 98% of premined coins were locked in escrowed wallets, details at announcement thread
** For curiosity, please consult this script which emulates the algorithm of Sumokoin's block-reward emission
*** Calendar months for block reward changes are estimated (based on difficult target x heights) and, therefore, would be a bit different in practice. Block reward for each turn is also not a fixed number yet not expected to change much (if any)

Chart 1: Sumokoin Block Reward by Calendar Year

Chart 2: Sumokoin Block Reward by Calendar Month

Chart 3: Sumokoin Emission Speed - SUMO vs BTC



  • Sumokoin, as a fork of Monero, is a CryptoNote-based cryptocurrency. The CryptoNote original whitepaper can be downloaded here and you can check the annotated whitepaper by Monero Research Lab here. Surae Noether did a full review of the whitepaper and his work can be found here
  • Please visit Monero Research Lab (MRL) for other publications and whitepapers

GUI Wallet

Current version: v0.0.1-BETA 1.1




Current version: v0.1.2.0 "Hokkaido"*

* Hokkaido: the northernmost of Japan’s main islands, is known for its volcanoes, natural hot springs and ski areas


Source Code

Sumokoin's source code is open and hosted at Github. You are welcome to fork, contribute, report bugs or suggest new features to the project.

Fork me


Block Explorer

Wallet Generator



Mining Pools (official pool) (by @billaue)



Contact & Socials

Feel free to contact us to provide some feedback, give us suggestions for new features, or to just say hello!

Sumokoin Twitter

Sumokoin Facebook

Sumokoin Dev Blog

Telegram Group Chat