Kangaderoo

Kangaderoo is a Netherlands-based open-source developer who contributed blueprints and front-end code to the Radix community during the run-up to Scrypto's Babylon release. His GitHub account was opened in December 2009 and holds 15 public repositories, the earliest of them cryptocurrency mining and poker-database tooling; his Radix work runs from an Olympia-era transaction exporter in 2022 to an RRC-404 front end in 2024.

Scrypto example blueprints

Between January and December 2023 he opened nine pull requests against radixdlt/community-scrypto-examples, the Radix-maintained collection of reference Scrypto code, seven of them merged. Four of the merged blueprints are still carried in the repository today:

• games/RaDiceX – a dice game against the house in which the player's ticket is an NFT that carries the game state. A ticket starts at level 10 and moves by the difference between the two rolls; at level 0 it can be renewed at a discount, at level 25 it redeems for five times the buy-in, and it can be burned when the player is finished.
• defi/trustmore – a mediator pattern for the case trustless code does not cover. Two parties funding one escrow vault can deadlock it in a dispute, so the example pairs a Contract component with a Mediator component and works through how to keep the mediator itself from being abused.
• basic/wrapper – how one component calls another component's badge-gated method. The calling component keeps the authentication badge in its own vault and presents the proof at the call site, which for system-level authentication reduces to a single authorize wrapper around the call.
• basic/pokerdicebank – the banking component described below.

Two of the nine pull requests were maintenance rather than new code: he carried his own earlier contributions across Scrypto's breaking releases, from v0.7.0 to v0.8.0 in February 2023 and from v0.8.0 to v0.9.0 that April. Of the two that did not merge, Trueblood was closed in March 2023 and a Coin Dispenser pull request opened in August 2023 is still open.

PokerDice

The pokerdicebank blueprint is the on-ledger half of a working game. Its README sets out the reason it exists: playing every round on the network would spend a transaction fee per round, so rounds are played off-ledger against a back end and only the balances are kept in a component on Radix. The front end at pokerdice.kangaderoo.nl talks to that back end, which reads the component's balances and hands the browser the manifests the wallet is asked to sign. The site still answers on 13 August 2026.

RRC-404 front end

In March 2024 he published the front-end code for the RRC-404 project, a Radix implementation of the ERC-404-style hybrid token standard. RRC-404 lets a holder convert a token between fungible and non-fungible states, making otherwise-indivisible NFTs tradable as fractional, liquid assets. The repository is six commits made between 13 and 31 March 2024 – a JavaScript client that adds an NFT counter and a deficit indicator to the standard's mint-and-redeem flow – and it is the most recent commit of his own on any Radix repository. The claim survives a re-check on 29 August 2026, but only just, and the exception is worth naming: on 24 August 2026 he forked radixkingdoms, a browser-extension UI overlay for the on-ledger strategy game Radix Kingdoms. It is his first Radix-adjacent action on GitHub in over two years and it is not his code – all three commits in the repository are authored by its upstream owner, TibiaGoogleMaps. A fork is a bookmark with a copy attached, and this one is the fifteenth public repository on the account.

RadixTransactions

His first Radix repository predates Babylon. RadixTransactions, published on 3 November 2022, is a short Python script that writes every transaction to and from a given account to a CSV file. It reads the ledger through RadixLib, Omar Abdulla's MIT-licensed Python client for Olympia, and needs nothing but the public account address – the README is explicit that no secret is required, and the address it exports is a constant the user edits in the source.

Before Radix

Ten of his fifteen public repositories predate his Radix work and are mining and hashing tooling from the 2013–2017 altcoin era: CPU miners for scrypt and NeoScrypt, an Android wrapper around Pooler's cpuminer, a fork of the yiimp mining-pool software, and a WebGL scrypt implementation. The most-starred of everything he has published is vanitygen at 21 stars, a generator for vanity Bitcoin addresses whose inner loop he rewrote to use SSE and AVX instructions. The oldest is a fork of the Free Poker Database from December 2009.

External links

• GitHub – @kangaderoo
• His pull requests to community-scrypto-examples
• pokerdice.kangaderoo.nl – PokerDice
• RRC-404 front-end repository
• RadixTransactions
• kangaderoo.nl