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    private void pkDisplay(Web3j web3j) throws Exception {
        String privateKey1 = "1587352d059682a7ebb86e4aecc86f73cf418d33f9af4178ce344a3dd41a813b";
        Credentials credentials = Credentials.create(privateKey1);
        log.info("Address: " + credentials.getAddress());

        List<String> labels = Arrays.asList(
                "string message_id",
                "address receiver",
                "uint32 block_created",
                "uint192 balance",

ice09

Evaluating xDai Stable Chain for B2B Use Cases

The xDai Stable Chain is an Ethereum sidechain with a native stable coin and a bridge to the Ethereum Mainnet for the native currency xDai, which represents DAI on the Ethereum Mainnet.

A native stable coin is a distinctive feature for financial and other Enterprise use cases which could profit of decentralized aspects of Blockchains, but cannot accept the usage of a highly volatile native crypto currencies.

The xDai Stable Chain is very cheap in transaction fees and very fast, but lacks other important features of the Ethereum Mainnet. This post will try to give enough information to enable the reader to decide if the xDai Stable Chain can be of use for her prototype, PoC, MVP or even a working product.

Intention

ice09

SELECT event.block_number, args->0->>'hex' as "from",
       args->1->>'hex' as "to",
       CAST(args->2->'num' AS NUMERIC) AS "value"
FROM event
WHERE event.address = '0x29b9a7fBb8995b2423a71cC17cf9810798F6C543'
AND event.event = 'Trust'
AND event.block_number > 12529458
order by event.block_number desc

ice09

# Users with most outgoing trusts
# MATCH (tr:User)-[r:TRUSTS]->(te:User)
# RETURN tr AS Truster, COUNT(r)
# ORDER BY COUNT(r) DESC

Truster,COUNT(r)
"{""name"":cuinima1,""address"":0xBFB9749A89376565C79e17050842413F3AB43821,""image_url"":https://circles-ubi.s3.amazonaws.com/uploads/avatars/285246319f75cbb68f35154d4fa019043ded41ea2ae6010b7156e7ea8c6c099e.jpg}",3297
"{""name"":cuinima3,""address"":0x674Ee4c8B66f54c91e62fe49EadFA1A70b5b8DA4,""image_url"":https://circles-ubi.s3.amazonaws.com/uploads/avatars/609392f19687b3f5c6454b467a539843258bff229fc270c8b7624b575034b850.jpg}",2843
"{""name"":cuinima,""address"":0xD5eFcB307623728989E0431277C6230c2666cA69,""image_url"":https://circles-ubi.s3.amazonaws.com/uploads/avatars/22072a6eafe63a2a10e6dbd7acf6ed72fa4d0d79e6ca4adbcb0c919626dcf8b4.jpg}",2330
"{""name"":f4az3zl8ek,""address"":0xCb5D036b9661D119003C487915b18F7118Cdb8eE}",967

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y8zm1lynyq

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version: '3'
services:

  blockchain-listener-fs:
    image: blockchain-listener:0.0.1-SNAPSHOT
    container_name: blockchain-listener-fs
    restart: on-failure
    depends_on:
      - neo4j-writer-fs
      - rdbms-writer-fs

ice09

///usr/bin/env jbang "$0" "$@" ; exit $?
// Update the Quarkus version to what you want here or run jbang with
// `-Dquarkus.version=<version>` to override it.
//DEPS io.quarkus:quarkus-bom:${quarkus.version:1.11.0.Final}@pom
//DEPS io.quarkus:quarkus-resteasy
//DEPS io.quarkus:quarkus-resteasy-jackson
//DEPS io.quarkus:quarkus-smallrye-openapi
//DEPS io.quarkus:quarkus-swagger-ui
//Q:CONFIG quarkus.swagger-ui.always-include=true
//FILES germany_zip_codes.json

ice09

Instructions for Linux/WSL2

1. Create local volume for PostgreSQL data mkdir postgres-data
2. Use Postgres Docker image, Create Container storage with DB storage, User storage, and Password storage docker run -d --name storage -e POSTGRES_USER=storage -e POSTGRES_PASSWORD=storage -e PGDATA=/var/lib/postgresql/data/pgdata -e POSTGRES_DB=storage -p5432:5432 -v $PWD/postgres-data:/var/lib/postgresql/data postgres
3. Create Spring Boot Minimal JPA with PostgreSQL https://start.spring.io/#!type=maven-project&language=java&platformVersion=2.6.5&packaging=jar&jvmVersion=11&groupId=dev.wcs.minijpa&artifactId=local-storage&name=local-storage&description=Sample%20Project%20for%20a%20Minimal%20JPA%20with%20local%20Persistence%20using%20PostgreSQL&packageName=dev.wcs.minijpa.local-storage&dependencies=postgresql,data-jpa

ice09

public class ECRecover {

	private void pkDisplay() {
		//0x627306090abaB3A6e1400e9345bC60c78a8BEf57
		String privateKey1 = "c87509a1c067bbde78beb793e6fa76530b6382a4c0241e5e4a9ec0a0f44dc0d3";
		Credentials credentials = Credentials.create(privateKey1);
		System.out.println("pk:" + Numeric.toHexStringNoPrefix(credentials.getEcKeyPair().getPublicKey()));

		String message = "now that's a text";
		String label = "\u0019Ethereum Signed Message:\n"+ String.valueOf(message.getBytes().length) + message;

ice09

// SPDX-License-Identifier: AGPL

pragma solidity ^0.8.0;

import "./CRCTCConverterLib.sol";

contract CRCTCConverter {
    
    function crcToTc(uint timestamp, uint amount) external pure returns (uint) {
        uint precision = 10 ** 18;