Vlad Stan motorina0

Note A NIP PR has been open here, the conversation should move to the PR

Problem

Ratings give the reputation for a person, service or product. They are important for creating an open and free-market. It helps participants make decisions based on what their peers previously experienced with that person, services or product.

Having a rating system in an open and decentralized system (like nostr) is hard because anyone can join and give ratings. Thus bots will be created to overtake the honest human's votes.

Yet Another Shared UTXO Model

Prerequisites: basic understanding of BIP341.

The idea is similar with the TAPLEAF_UPDATE_VERIFY described by Anthony Towns on the Bitcoin-Dev Mailing List. However, this approach uses the concept of Stateful Tap-Tree in order to exclude certain tap-tree paths from being spent.

Overview

the tap-tree represents the funds of multiple participants (shared UTXO).
each tap-leaf in the tap-tree has its own "owner". One entity can "own" multiple tap-leafs.
before entering the "shared-utxo", each participant must check that the tap-tree is correctly constructed

	{
	"hash": "0e2b2714917bd9482baea0c8241420e813de977be5958d4c29d5f9e05b760d07",
	"left": {
	"hash": "0000000000000000000000000000000000000000000000000000000000000000"
	},
	"right": {
	"hash": "abd783474f581f3392decd6b41d2e0ceb8f82257440da46a4262b48fe9b49cfd",
	"left": {
	"hash": "2b3bbc598ae051d6fb5981b8b3673e071965a481329156b6561508c5171f4466",
	"left": {

	// How to run:
	// npm install -g ts-node typescript '@types/node'
	// ts-node play9.ts

	import * as ecc from 'tiny-secp256k1';
	import { ECPairFactory } from 'ecpair'

	import { Psbt } from './ts_src/psbt'
	import { p2tr } from './ts_src/payments/index'
	import { testnet as network } from './ts_src/networks'

	package itest

	import (
	"bytes"
	"context"
	"encoding/hex"
	"time"

	"github.com/btcsuite/btcd/wire"
	"github.com/btcsuite/btcutil"

	// The time interceptor should be first
	CommandExecutorImpl commandExecutor = ((CommandExecutorImpl) processEngineConfiguration.getCommandExecutor());
	this.oldFirstCommandInterceptor = commandExecutor.getFirst();

	TotalExecutionTimeCommandInterceptor timeCommandInterceptor = new TotalExecutionTimeCommandInterceptor();
	timeCommandInterceptor.setNext(oldFirstCommandInterceptor);
	commandExecutor.setFirst(timeCommandInterceptor);

	public <T> T execute(CommandConfig config, Command<T> command) {
	//...
	long start = System.currentTimeMillis();
	T result = next.execute(config, command);
	long end = System.currentTimeMillis();
	long totalTime = end - start;
	//...
	}

	List<HistoricActivityInstance> processSteps = nativeHistoricActivityInstanceQuery
	.sql("select RES.* from `activiti`.`ACT_HI_ACTINST` RES" + " WHERE RES.PROC_INST_ID_ = \"30\"").list();