{"id":19057984,"url":"https://github.com/signum-network/signum-smartj","last_synced_at":"2026-02-26T19:05:47.411Z","repository":{"id":37019726,"uuid":"182412693","full_name":"signum-network/signum-smartj","owner":"signum-network","description":"SmartJ: Java smart contracts for Signum","archived":false,"fork":false,"pushed_at":"2024-01-28T13:51:37.000Z","size":750,"stargazers_count":45,"open_issues_count":5,"forks_count":19,"subscribers_count":10,"default_branch":"master","last_synced_at":"2025-03-30T07:22:07.293Z","etag":null,"topics":["bitcoin","burstcoin","contracts","ethereum","signum","smart"],"latest_commit_sha":null,"homepage":"https://signum.network/smartcontracts.html","language":"Java","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"gpl-3.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/signum-network.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":"CODE_OF_CONDUCT.md","threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2019-04-20T13:59:44.000Z","updated_at":"2025-03-19T13:39:38.000Z","dependencies_parsed_at":"2023-02-18T10:18:00.899Z","dependency_job_id":null,"html_url":"https://github.com/signum-network/signum-smartj","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/signum-network%2Fsignum-smartj","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/signum-network%2Fsignum-smartj/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/signum-network%2Fsignum-smartj/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/signum-network%2Fsignum-smartj/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/signum-network","download_url":"https://codeload.github.com/signum-network/signum-smartj/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":250572012,"owners_count":21452325,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["bitcoin","burstcoin","contracts","ethereum","signum","smart"],"created_at":"2024-11-09T00:00:14.428Z","updated_at":"2025-09-21T22:33:07.635Z","avatar_url":"https://github.com/signum-network.png","language":"Java","funding_links":[],"categories":[],"sub_categories":[],"readme":"# SmartJ: Java smart contracts for Signum\n[![GPLv3](https://img.shields.io/badge/license-GPLv3-blue.svg)](LICENSE)\n[![](https://jitpack.io/v/signum-network/signum-smartj.svg)](https://jitpack.io/#signum-network/signum-smartj)\n\n[Signum](https://signum.network/) (previously know as Burstcoin) was the world's first HDD-mined\ncryptocurrency using an energy efficient\nand fair Proof-of-Capacity (PoC) consensus algorithm.\n\nIt was also the first to implement a turing-complete [smart contract](https://signum.network/smartcontracts.html)\nsystem in the form of *Automated Transactions* (AT), as specified by [CIYAM](http://ciyam.org/at/).\nHowever, before SmartJ, the creation and deployment of smart contracts required writing\n(assembler-like) bytecode and testing on-chain, making the development of contracts cumbersome.\n\nThis project allows the user to write, debug, and deploy Signum smart contracts relying only on Java.\nYou can use a simple text editor or your preferred IDE.\nSmartJ consists of the following key components:\n - **[Contract.java](src/main/java/bt/Contract.java)**: a Java abstract class defining the basic API available for contracts\n - **Emulator**: an emulated blockchain and respective UI\n - **Compiler**: a system to convert Java bytecode into Signum AT bytecode that can run on the Signum blockchain \n\n[![Simple hello world contract](http://img.youtube.com/vi/XcN5WxqjjGw/0.jpg)](https://www.youtube.com/watch?v=XcN5WxqjjGw \"Signum SmartJ sample application\")\n\nAs any open source project, this is experimental technology.\nPlease carefully inspect your compiled AT contracts and\ntest it exhaustively on the [testnet](https://github.com/burst-apps-team/burstcoin#testnet) before production.\n\n\n## Sample Contracts\nTake a look on the [samples source folder](src/main/java/bt/sample/).\n\n## Using (write your own contract)\n\n### Sample application\nThe easiest way to start with SmartJ is to clone this project and import as an **existing gradle project** using\nyour preferred IDE.\nCheck the [samples source folder](src/main/java/bt/sample/) and modify existing contracts or create new ones. \n\n### Add Signum SmartJ to your gradle project\nAdd the following to your gradle.build file:\n```\nrepositories {\n\tmaven { url 'https://jitpack.io' }\n}\ndependencies {\n\timplementation 'com.github.signum-network:signum-smartj:-SNAPSHOT'\n}\n```\n\n### Add Signum SmartJ to your maven project\nAdd the repository to your configuration:\n```\n\u003crepositories\u003e\n\t\u003crepository\u003e\n\t    \u003cid\u003ejitpack.io\u003c/id\u003e\n\t    \u003curl\u003ehttps://jitpack.io\u003c/url\u003e\n\t\u003c/repository\u003e\n\u003c/repositories\u003e\n\u003cdependency\u003e\n\t\u003cgroupId\u003ecom.github.signum-network\u003c/groupId\u003e\n\t\u003cartifactId\u003esignum-smartj\u003c/artifactId\u003e\n\t\u003cversion\u003e-SNAPSHOT\u003c/version\u003e\n\u003c/dependency\u003e\n```\n\n## License\n\nThis code is licensed under [GPLv3](LICENSE).\n\n## Author\n\njjos\n\nDonation address: S-JJQS-MMA4-GHB4-4ZNZU\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsignum-network%2Fsignum-smartj","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsignum-network%2Fsignum-smartj","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsignum-network%2Fsignum-smartj/lists"}