3. FIPA4_CoinDays(zh-CN)

FIPA4_CoinDays(zh-CN)

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    FIPA4: CoinDays
Version: 2
Language: zh-CN
Author: C_armX, Deisler-JJ_Sboy
Status: draft
Created date: 2022-10-01
Last modified date：2022-12-06
PID: "unknown"
TXid:

    FIPA4_CoinDays(en-US)

    Contents

    ⌊Introduction⌋(#introduction)

    ⌊General rules of FIPA type protocols⌋(#general-rules-of-fipa-protocols)

    ⌊Rules specific to this protocol⌋(#rules-specific-to-this-protocol)

    ⌊Example⌋(#Example)

    Introduction

    
ProtocolType: FIPA
SerialNumber: 4
ProtocolName: CoinDays
VersionNumber: 1
Description : CoinDays is an basic property of FCH output.
Author: C_armX, Deisler-JJ_Sboy
Language: en-US
Tags: FIPA, CoinDays
PreVersionPid:"unknown"

    General consensus of FIPA protocols

    FIPA protocols make improvements to the FCH ecosystem. These improvements will not lead to a hard fork of the main network, and will not write information on the blockchain.

    Rules specific to this protocol

    1. 本协议定义币天（CD, CoinDays）和币天销毁（CDD, CoinDays Destroyed）两个指标，计算的基础实体为交易的输出（output）。
    2. Output：计算币天的Output是链上交易产生的具有一定金额的输出，不包括op_return输出。
    3. CoinDays(币天，缩写：CD) ：未被花费的Output的FCH的数量与该Output生存天数的乘积。FCH的数量先以聪为单位与向下取整后天数相乘，结果除以100000000折算为FCH与天的乘积，再向下取整：
    	CD = ⌊(C * D)/100000000⌋

	C：FCH的数量，取Output的value值，单位为聪。1 FCH = 100000000 satoshi。
	D：生存天数，最新区块时间戳减去Output诞生的区块时间戳后按天取整的值。
	时间戳：Unix时间戳，精确到秒。
	
	D = ⌊(currentTimestamp - birthBlockTime)/(60*60*24)⌋
	
	CD = ⌊C * ⌊(currentTimestamp - birthBlockTime)/(60*60*24)⌋/100000000⌋
    1. CoinDays Destroyed (币天销毁，缩写：CDD)：已被花费的Output，其生存期间积累的全部币天在花费时被销毁了，称为币天销毁。
    	CDD = ⌊C * ⌊(spentBlockTime - birthBlockTime)/(60*60*24)⌋/100000000⌋
    1. CD是未花费交易输出（UTXO，unspent transaction output）的属性，CDD是已花费交易输出（STXO, spent transaction output)的属性。
    2. 单位：CD和CDD均以小写的cd为单位。
    3. Output是计算币天的基础实体，交易、区块或区块链的币天由所包含的Output的币天汇总产生
    4. FCH地址的CD为所有UTXO的CD的总和，CDD为所有STXO的CDD的总和。

    Example

    CD of UTXO

    C = 1580000000 satoshi
    birthBlockTime = 1577837394
    currentTimestamp = 1664612535
    D = ⌊(1664612535 -1577837394)/(606024)⌋ = 1004 days
    CD = ⌊C * D/100000000⌋ = ⌊2580000000*1004/100000000⌋ = ⌊15863.2⌋ = 15863 cd

    	public void cd() {
		long c = 1580000000L;
		long birthBlockTime = 1577837394L;
		long bestBlockTime = 1664612535L;
		long d = Math.floorDiv(bestBlockTime-birthBlockTime,60*60*24);
		long cd = Math.floorDiv(c*d,100000000);
		System.out.println("CD: "+cd+"cd");	
	}//CD: 15863cd

    CDD of STXO

    C = 625000000 satoshi
    birthBlockTime = 1577837394
    spentBlockTime = 1634026927
    D = ⌊(1634026927 -1577837394)/(606024)⌋ = 650 days
    CDD = ⌊C * D/100000000⌋ = ⌊625000000*650/100000000⌋ = ⌊4062.5⌋ cd = 4062 cd

    	public void cdd() {
		long c = 625000000L;
		long birthBlockTime = 1577837394L;
		long spentBlockTime = 1634026927L;
		long d = Math.floorDiv(spentBlockTime-birthBlockTime,60*60*24);
		long cdd = Math.floorDiv(c*d,100000000);
		System.out.println("CDD: "+cdd+"cd");	
	}//CDD: 4062cd
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