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一提到金融,大家最先想到的恐怕就是银行。不管是转账、存款还是贷款,几乎都得通过银行来完成。这就是我们熟悉的中心化金融。银行,就是那个不可或缺的中心。
" \# H$ s# c4 m5 ]但有没有一种可能,金融活动可以不再依赖银行这样的中间机构?答案就是DeFi,去中心化金融。, N6 P% o% p) j3 |) f$ G3 j h3 O
在DeFi的世界里,一切金融操作都在区块链上完成,靠的是提前写好的智能合约自动执行。
" O6 p8 o: w# o h6 m6 c" Y- I没有柜台、没有信贷员、甚至没有银行,只有代码和规则。
+ y6 ^" j5 N: M7 d3 `' `, P以借贷为例。, k7 r/ l# s# }/ `) o. H* d
传统世界里,你想向银行贷款,得提交收入证明、抵押房产,签一堆文件,等银行审核通过后才能拿到钱。
) T) H1 b* `# a2 q而在DeFi中,这一切变得像在一个全自动的当铺里进行。你不用面对任何人,只需跟程序打交道。
) e. W& T$ a9 a4 f' \这个当铺能运转,靠的是下面3个核心部件, [3 C6 X# n6 {# R2 d- P9 M
区块链好比一个公开的账本,记录所有交易,谁都不能篡改。比如在以太坊上记录了你的账户下有1000个以太币,你有这1000个以太币才能进行抵押借贷。
% C7 a5 a2 O2 Q. H然后抵押借钱的关键在于,你抵押的资产到底值多少钱。1 E( G8 e( v! G/ `) C \- _. Y
传统金融中有专门的人来评估你的房产。在Defi中则依靠Chainlink 预言机,它负责实时汇报外部价格。比如说1个以太币3000美元。
1 K6 w9 }6 U9 ~' p- B有了区块链和预言机,当铺才知道了你抵押的资产值多少钱。但你能借多少钱,利息多少,钱从哪里来。$ y; z c) L. @7 J7 e& O
这些就是借贷协议层,这里就相当于当铺本体,规定了借贷行为的各种规则
$ O$ }, |; M& @7 \: P典型代表有 Aave 和 Compound。
. k, b1 d d0 g) L' s0 H比如我们定义了资金池,所有想赚利息的人,把钱存进来的,形成了一个大资金池。这些钱就可以拿去借给别人。3 p- k2 c' M- `& m1 s
你想借钱,就从池子里拿。你存钱进去,就相当于当了债主,能收到别人借钱的利息。
, E' [5 A: o! N! q! _你想借100块钱,那你必须抵押价值至少150块的东西,防止你借钱跑了。( [7 ]" T Z4 k- }0 e
万一你抵押的东西价格暴跌,只值120块了,机器人店员不会打电话催你,会直接把你抵押的东西卖掉,先把100块本金拿回来,保护资金池的安全。这个过程就叫清算,对你来说很无情,但对存钱的人来说很安全。 l( y' M8 a5 m0 ~. _
这些零零散散的借贷协议,保证了当铺的运作。
% G/ z& i2 I5 P$ l8 `! U5 n( c- P1 wDeFi不是虚无的概念,它正在重构我们对金融的认知。当然,它仍处于早期阶段,高收益往往高风险,特别是智能合约漏洞和资产波动可能导致资产直接归零。# p2 B& B4 C% p4 a% i6 M
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