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package tech.blockchainers.crypyapi.http.common;

import org.web3j.utils.Numeric;

import java.io.PrintStream;

// taken from https://github.com/eugenp/tutorials/blob/master/data-structures/src/main/java/com/baeldung/printbinarytree/BinaryTreePrinter.java

public class BinaryTreePrinter {

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// SPDX-License-Identifier: AGPL
pragma solidity ^0.7.0;

abstract contract ICirclesToken {
    
    function look() virtual public view returns (uint256);

    /// @notice receive a ubi payout
    /// @dev this is the method to actually update storage with new token balance
    function update() virtual public;

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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

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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

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# 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

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///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

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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

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// 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;