初遇魔法村：一块会记事的透明石碑

蝉鸣声把午后的阳光剪得碎碎的，八岁的小宇攥着半根没吃完的冰棒，站在岔路口发愁——本来要去南山奶奶家，跟着导航走错了路，四周都是高高的向日葵花田，连个问路的大人都没有。冰棒化得很快，甜丝丝的汁水流到手腕上，他正准备抽纸巾擦，就看见花田尽头跑过来一个扎羊角辫的小女孩，怀里抱着一大束向日葵，辫梢还系着个亮闪闪的黄色蝴蝶结。

"你是迷路了吗？"小女孩跑到他面前，把向日葵往身后藏了藏，眼睛弯得像月牙，"我是莉莉，魔法村的村民，你是来玩的吗？" "我、我去奶奶家，走错路了。"小宇有点不好意思，把化了半根的冰棒举起来，"你要吃吗？" 莉莉眼睛一下子亮了，接过冰棒咬了一口："哇，是芒果味的！我们魔法村好久没人带新玩具来了，我带你去村里玩好不好？我们村有个特别酷的宝贝，你肯定没见过！"

<!-- 纸书插图提示1-1：莉莉扎着黄色蝴蝶结，抱着向日葵站在向日葵花田里，小宇站在对面，手里拿着化了一半的芒果冰棒，背景是蓝天白云 --> <!-- 电子版侧边栏：📌 小知识：魔法村的设定参考了现实中的区块链技术哦，它的核心特点就是透明、不可篡改、集体维护，下面我们会慢慢讲给你听～ -->

The cicada's song cut the afternoon sunlight into pieces. Eight-year-old Xiao Yu held a half-eaten popsicle, standing at a crossroads feeling worried—he was supposed to go to his grandma's house in Nanshan, but he took a wrong turn following the navigation. All around him were tall sunflower fields, and there wasn't even an adult to ask for directions. The popsicle was melting fast, and the sweet juice dripped onto his wrist. Just as he was about to grab a tissue to wipe it off, he saw a little girl with pigtails running towards him from the end of the sunflower field, holding a big bouquet of sunflowers, with a shiny yellow bow tied to the end of her braid.

"Are you lost?" The little girl ran up to him, hiding the sunflowers behind her back, her eyes curved like crescents. "I'm Lily, a villager of the Magic Village. Are you here to play?" "I... I'm going to my grandma's, I took a wrong turn." Xiao Yu felt a little embarrassed, holding up his half-melted popsicle. "Do you want some?" Lily's eyes lit up immediately, she took a bite of the popsicle: "Wow, it's mango flavor! We haven't had anyone bring new toys to the Magic Village for a long time, I'll take you to play in the village, okay? We have a super cool treasure in the village, you must have never seen it!"

两个人沿着花田里的小路走，路两边开满了向日葵，风一吹就晃着金色的花盘。莉莉一边走一边跟小宇讲魔法村的事："我们村以前跟别的村一样，大家都找村长记账，谁家卖了多少鸡蛋，谁家买了多少米，都记在村长的小本子上。可是上个月出了个大麻烦，老张家的小山羊跑出来，啃坏了李阿姨家三棵刚种的小白菜，李阿姨找老张家赔，老张家说只啃坏了一棵，两个人吵得不可开交，找村长评理，村长那天记错了，把三棵记成了两棵，两个人都不服，闹了整整三天，村里的大人们都没办法。"

小宇听得睁大了眼睛："那后来怎么解决的呀？" "后来呀，咱们村的创始魔法师就做了一个特别大的透明石碑，放在村口，以后村里所有的事都刻在石碑上，谁也没法偷偷改。"莉莉指了指前面，"你看，那就是！"

The two walked along the small path in the sunflower field, with sunflowers blooming on both sides of the road, their golden flower heads swaying in the wind. Lily walked and told Xiao Yu about the Magic Village: "Our village used to be the same as other villages, everyone asked the village chief to keep accounts. Who sold how many eggs, who bought how much rice, all were recorded in the village chief's small notebook. But last month there was a big problem: Old Zhang's little goat ran out and ate three just-planted cabbage seedlings in Aunt Li's vegetable garden. Aunt Li asked Old Zhang to compensate, but Old Zhang said only one was eaten. The two argued endlessly, and asked the village chief to judge. The village chief made a mistake that day, writing down two instead of three, and neither of them was convinced. They argued for three whole days, and the adults in the village couldn't do anything about it."

Xiao Yu's eyes widened as he listened: "How was it solved later?" "Later, our village's founding wizard made a super big transparent stone tablet and put it at the village entrance. From then on, all things that happened in the village were carved on the stone tablet, and no one could secretly change it." Lily pointed ahead. "Look, that's it!"

转过最后一个向日葵田的弯，一块巨大的透明石碑就出现在小宇面前。石碑有三层楼那么高，通体是透明的水晶材质，在太阳下闪着柔和的光，上面密密麻麻刻满了小字，字缝里还流动着淡金色的光。好多村民围在石碑旁边，有的在找自己家今天卖的鸡蛋的记录，有的在查昨天谁家捡到了自己的小鸭子，还有的小孩子拿小树枝在石碑旁边的沙地上写写画画，假装自己也刻了字。

"哇，好大！"小宇跑到石碑底下，踮着脚看上面的字，发现字是自动刻上去的，刚看见张阿姨卖了一篮草莓，字就慢慢浮了出来，"这些字都是谁刻的呀？" "不用人刻哦，"莉莉拉着他走到石碑前面，手指轻轻碰了碰石碑表面，"只要有村民发生了交易，比如张阿姨把草莓卖给王叔叔，石碑就会自动把这件事刻上去，连时间、谁买的、多少钱都写得清清楚楚，谁也没法涂改，谁也没法偷偷删掉。"

小宇歪着头看了一会儿，突然想到了什么："那要是有人想改自己不想让别人知道的事怎么办？比如我欠小美五颗糖，我把记录改成小美欠我五颗，不行吗？" 莉莉笑了，从口袋里掏出个小石子，在石子上刻了两行字：一行是"小宇欠莉莉十颗奶糖"，另一行是"小美欠小宇五颗糖"，然后她把刻着假记录的石子放到自己口袋里的小石碑旁边——每个村民家里都有个巴掌大的小石碑副本，和村口的大石碑内容完全一样。 "你看，"莉莉把小石碑拿出来给小宇看，上面根本没有那两行假刻的字，"就算我在自己的小石子上刻了假记录，放到我家的石碑旁边，全村所有人的石碑上都还是原来的内容，而且这个假记录的'魔法指纹'和真的对不上，大家一眼就能看出来是假的，根本不会信。要是有人真的想改全村人的石碑，就得跑遍全村一百户人家，把每一户的石碑都改了，这根本不可能呀！"

Turning around the last bend of the sunflower field, a huge transparent stone tablet appeared in front of Xiao Yu. The stone tablet was as tall as three floors, made of transparent crystal, shining with a soft light in the sun, covered densely with small characters, with faint golden light flowing between the words. Many villagers gathered around the stone tablet, some looking for records of their family's egg sales today, some checking who found their little duck yesterday, and some children writing and drawing on the sand next to the stone tablet with small branches, pretending they also carved words on it.

"Wow, it's so big!" Xiao Yu ran under the stone tablet, stood on tiptoe to look at the words, and found that the words were carved automatically. Just as he saw Aunt Zhang selling a basket of strawberries, the words slowly emerged. "Who carved these words?" "No one needs to carve them," Lily pulled him to the front of the stone tablet, her finger gently touching the surface of the tablet. "As long as a villager makes a transaction, for example, Aunt Zhang sells strawberries to Uncle Wang, the stone tablet will automatically carve this event on it, writing clearly the time, who bought it, and how much it cost. No one can paint over it or secretly delete it."

Xiao Yu tilted his head and looked for a while, then suddenly thought of something: "What if someone wants to change something they don't want others to know? For example, I owe Xiao Mei five candies, I change the record to Xiao Mei owes me five, can't I do that?" Lily laughed, took out a small pebble from her pocket, carved two lines on the pebble: one was "Xiao Yu owes Lily ten milk candies", the other was "Xiao Mei owes Xiao Yu five candies". Then she put the pebble with the fake record next to the small stone tablet in her pocket—every villager has a palm-sized small stone tablet copy at home, exactly the same as the big stone tablet at the village entrance. "Look," Lily took out her small stone tablet to show Xiao Yu, there were no two lines of fake carvings on it at all. "Even if I carve a fake record on my own small pebble and put it next to my family's stone tablet, the stone tablets of all the villagers in the village still have the original content, and the 'magic fingerprint' of this fake record does not match the real one. Everyone can see it's fake at a glance, and no one will believe it. If someone really wants to change the stone tablets of the whole village, they have to run through all 100 households in the village and change every household's stone tablet, which is simply impossible!"

小宇听得眼睛都亮了，伸手摸了摸石碑冰凉的水晶表面，发现上面的字摸上去是凸起来的，像真的刻上去的一样。这时候旁边传来一阵笑声，是卖蜂蜜的王叔叔，他正跟李阿姨说话，手里举着个小本子："以前我卖蜂蜜都记在这个本子上，上个月卖给小明家的两瓶槐花蜜，我忘了记，月底算账的时候对不上，还跟小明家闹了误会，现在我把每次卖蜂蜜的账都刻在石碑上，谁买了多少，多少钱，什么时候买的，都清清楚楚，再也没出过错。"

"对呀，"莉莉接过话，"以前村长记账，要是村长去城里探亲了，大家想查账就找不到人；要是村长的小本子被狗啃了，账就全没了；要是村长故意记错，给自己家多记卖鸡蛋的钱，大家也不知道。现在用这块石碑，这些问题都没有啦！不管什么时候，不管谁，只要想查账，来石碑这里看就行，所有记录都是真的，改不了。"

<!-- 纸书插图提示1-2：王叔叔举着个小本子，跟李阿姨说话，背景是村口的大石碑，上面刻着蜂蜜交易的记录 --> <!-- 电子版侧边栏：📌 小知识：这种不是由某一个人单独记账，而是全村每家每户都有一本一模一样的账本，大家一起核对、一起更新的记账方式，有个很酷的英文名字，叫`Distributed Ledger`，翻译过来就是「分布式账本」——「分布式」就是「分散在每个人手里」的意思啦！ -->

Xiao Yu's eyes lit up as he listened, he reached out and touched the cold crystal surface of the stone tablet, and found that the words on it were convex, just like they were really carved. At this time, there was a burst of laughter from the side, it was Uncle Wang who sold honey, he was talking to Aunt Li, holding a small notebook in his hand: "In the past, I recorded my honey sales in this notebook. Last month I sold two bottles of locust honey to Xiao Ming's family, but I forgot to record it. When I checked the accounts at the end of the month, they didn't match, and I had a misunderstanding with Xiao Ming's family. Now I carve all my honey sales accounts on the stone tablet. Who bought how much, how much it cost, and when it was bought are all clear, and I