TokenScript - Attestation

This repository host the attestation libraries as part of TokenScript. Discussion goes to the forum https://community.tokenscript.org/

You can always use this project in your own code through Maven central, by adding the following dependency in your POM:

<dependency>
  <groupId>org.tokenscript</groupId>
  <artifactId>attestation</artifactId>
  <version>0.4.1</version>
</dependency>

This repository's library serves 3 use-cases of attestations.

Use-case	Description	Protocol	Cmd Demo
Identifier attestation	Identifies a person by their Internet identifier such as Twitter Handle and email address.	See below
Cheque	Cheque: a signed message allows the beneficiary to perform an action, such as withdrawing Ether.	Send-token-by-identifier	demo.
Attestation as token	An attestation that can be used as a non-fungible token.

How is the code organised?

The code is not compartmentalised by use-cases, since they share common components. We provide the common components as library, then, for each use-case, a commandline utility.

Since in most cases these attestations are used on the web, Web-developers should be more interested in attestations being implemented as part of token-neogotiation instead of the basic commandline form. Therefore, this repository should be more of interest by the protocol developers. Our JavaScript based token negotiation implementation is at the token-negotiator repo.

Together with repos that uses the library code, in total we maintain 4 repos. The relationship between these 4 repos are demonstrated here. This one is the first (the upper-left one).

Build

You need the following installed:

• JDK (version 11 or higher)
• Gradle (version 7.1.1 is used by our devs)
• node.js (version 15 is used by our devs)

Once you have them installed, run:

$ gradle build

The build script will run a few tests, resulting a few pem files created in build/test-results/ directory.

Try it yourself

To create a jar file for running the demo, run:

$ gradle shadowJar

Which will create a jar file that you can run in the commandline

build/libs/attestation-all.jar

There is a walk-through to use the functionalities provided by this library through commandline: commandline cheque demonstration and the commandline EIP712 attestation demonstration

Organisation of this repo

This repository has the following content:

data-modules :the data modules definitions used in this project

src :the implementation of the attestation and protocols. We use a Java-Solidity model for quick prototyping - testing.

ethereum/lib : lib for smart contracts which uses attestations

ethereum/issuers : example smart contracts used by issuers, for example, revocation list management.

ethereum/trustlist : members of trustlists to be adopted by smart contracts

ethereum/experiments : work not in the published specifications

ethereum/example-james-squire : an example to be used in your projects which requires attestations

paper : the paper behind the design of this project. The current version there is dated (2018) and doesn't reflect the new work in the last a few years. The current focus is the cheque/attestation protocol

ERC publications

ERC's related to this stream of work are:

ERC1386, ERC1387 & ERC1388