Official site: https://erascan.info
Video presentation: https://youtu.be/MMRTkGeBBoI
Erasure is a smart contract protocol that brings simple web3 primitives to any website on the internet. The initial primitives available on Erasure are Recourse, Track-Record, and Payments. These primitives could help customers to create interesting business logic.
However, blockchain solutions usually has a barrier to implementation. They requieres specific plugins (like Metamask) to be installed on client side, their libraries are heavy weighted, etc. As result it's usually difficult and expersive to integrate them with existing services.
Erascan is created as supplimentary tool (like Etherscan) to help developers for development. It speeds up development, provide comprehesive tools for testing logic and could be use partly as third party service to show list of proofs, creating feed etc.
The last statement is exptremly significant, cause many IT businesses use lean product metodology and Erascan could drastically reduce costs for hypothesis testing.
Erascan has three main areas:
Track-Record is about proving historical quality. It's the public track record of the past. Prospective counterparties can evaluate the credibility of your claims and decide if they trust you by looking at your history. It’s your personal brand, it’s your credit score, it’s your Twitter feed. This is where blockchains shine. It only makes sense for this track record to be permanent and immutable.
With Erascan your could check latest feeds, explore them and use search by feed id, creator / operator hashes. You could also create Feed and add hashes manually using the tool.
Recourse is the final piece of the puzzle. It’s the court system that performs arbitration over breach of contract. It’s the Uber rating system. It’s a coordination mechanism fundamentally hardwired in each of us. It’s also something that can be programmed in a smart contract. This is where Erasure shines.
With faucet you could get NMR tokens for testing your application. Currently, you could get 10 NMR each 24 hours.
Client: React, redux, web3.js, IPFS, Graph (https://thegraph.com), GraphQL
Backend: Golang, go-cache, go-ethereum, gin-gonic
Erascan uses erasure subgraph (https://api.thegraph.com/subgraphs/name/jgeary/erasure-rinkeby120) for getting information from smartcontracts. For making this work more flexible, 2 react components were designed:
https://github.com/MikaelLazarev/erascan/blob/master/client/src/components/Widgets/DetailsWidget.js DetailsWidget renders infromation for any particular entity
| Name | Type | Descrition |
|---|---|---|
| id | String | Id of element to show |
| itemName | String | Name of variable which used in GraphQL query |
| fields | Array | Array of objects containg information about rendering values |
Fields format
| Field | Type | Description |
|---|---|---|
| name | String | Title for each field |
| field | String | Field as it provided in GraphQL response |
| sm | Number | Value for bootstrap redndering |
| type | String | String - for strings, Timestamp for timestamps and Address for rendering ethereum addresses |
https://github.com/MikaelLazarev/erascan/blob/master/client/src/components/Widgets/ListWidget.js ListWidget renders information for list query
| Name | Type | Description |
|---|---|---|
| query | String | GraphQL query |
| variables | Object | variables for graphQL query |
| title | String | Title for list |
| itemName | String | item name which would be extracted by GraphQL |
| renderItem | React.Component | Render item react component |
| rightToolbar | React.Component | React component for right toolbar |
| renderThead | React.Component | React component for rendering thead |
In turn, these components use QueryWrap, an universal compnonent which provides functionaly for better querying GraphQL and showing errors / loading messages.
Using this abstractions make code cleaner, you need graph query only to render your info.