储蓄分红合约指的是项目方发起了一个锁仓计划(即储蓄合约和取现合约),用户可以在准备期自由选择锁仓金额参与该计划,等到锁仓到期之后还可以自动获取锁仓的利润。用户可以在准备期内(dueBlockHeight)参与储蓄,按照合约规定可以 1:1 获取同等数量的储蓄票据资产,同时用户锁仓的资产(deposit)将放到取现合约中,并且项目方是无法动用的,等到锁仓期限(expireBlockHeight)一到,用户便可以调用取现合约将自己储蓄的资产连本待息一同取出来。其示意图如下:
从上图中可以看出,项目方发布了一个利润为20%的锁仓项目,其中储蓄合约FixedLimitCollect锁定了1000个票据资产(bill),同时项目方将200个储蓄资产(deposit)锁定到利息合约中。待项目方发布完合约之后,所有用户便可以参与了。例如上图中user1调用合约储蓄了500,这500个储蓄资产将被锁定在取现合约FixedLimitProfit中,同时user1获得了500个票据资产,剩余找零的资产将继续锁定在储蓄合约FixedLimitCollect中,以此类推,user2和user3也是相同的流程,直到储蓄合约没有资产为止。取现合约FixedLimitProfit跟储蓄合约的模型大致相同,只是取现合约是由多个UTXO组成的,用户在取现的时候可以并行操作。但是如果合约中的面值不能支持用户一次性取现的话,需要分多次提取。例如user1拥有500个票据资产,而可以获得的本息总额为600,但是取现的UTXO面值为500,那么user1一次最多只能取500,剩下的100需要再构造一笔交易来提现。/ R0 ?+ m! b8 g5 Q5 g
合约源代码7 n$ k7 _' y8 k+ J1 E0 D! m9 R5 p
// 储蓄合约1 d, z9 P6 ?. Z( l
import "./FixedLimitProfit"
contract FixedLimitCollect(assetDeposited: Asset,
totalAmountBill: Amount,) g- }. c. f; P8 N2 c u. U g
totalAmountCapital: Amount,
dueBlockHeight: Integer,
expireBlockHeight: Integer,
additionalBlockHeight: Integer,
banker: Program,
bankerKey: PublicKey) locks billAmount of billAsset {5 z) h1 X/ [0 ^8 c
clause collect(amountDeposited: Amount, saver: Program) {
verify below(dueBlockHeight)9 [9 {8 R. I) c
verify amountDeposited 0 && sTotalAmountBill > 0
if amountDeposited & d' T& ~/ N4 t/ T5 j
// 取现合约(本金加利息)- Q* n1 ]8 |& R
contract FixedLimitProfit(assetBill: Asset,! o! F, M7 v5 N# E, l' N
totalAmountBill: Amount,! P& q, K% |! y2 x. Z" l
totalAmountCapital: Amount,
expireBlockHeight: Integer,
additionalBlockHeight: Integer,5 R) n9 S% H; u
banker: Program,
bankerKey: PublicKey) locks capitalAmount of capitalAsset {
clause profit(amountBill: Amount, saver: Program) {
verify above(expireBlockHeight)* p6 E6 V: [. k! Q) }. A8 Y
define sAmountBill: Integer = amountBill/100000000
define sTotalAmountBill: Integer = totalAmountBill/1000000008 K: N7 w: u$ U
verify sAmountBill > 0 && sTotalAmountBill > 0 && amountBill 0 && gain ) s, ?5 K" K% ^2 h+ z$ z
合约的源代码说明可以具体参考Equity合约介绍.
注意事项:8 `1 Y" `2 h" A9 O$ Q4 D
编译并实例化合约9 S6 @; c: a$ `% ? m, ~* M8 N
编译Equity合约可以参考一下Equity编译器的介绍说明。假如储蓄合约FixedLimitCollect的参数如下:
assetDeposited :c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee4 q1 V& v, p* g/ X2 D; G
totalAmountBill :100000000005 A3 I' i5 J5 s
totalAmountCapital :20000000000
dueBlockHeight :10703 ?4 z" \: c/ F6 k! e
expireBlockHeight :1090
additionalBlockHeight :1100
banker :0014dedfd406c591aa221a047a260107f877da92fec5
bankerKey :055539eb36abcaaf127c63ae20e3d049cd28d0f1fe569df84da3aedb018ca1bf
其中bankerKey是管理员的publicKey,可以通过比原链的接口list-pubkeys来获取,注意管理员需要保存一下对应的rootXpub和Path,否则无法正确调用clause cancel。/ i% F' r0 k9 Q
实例化合约命令如下:& k; s# o! E( Z# V; U
// 储蓄合约
./equity FixedLimitCollect --instance c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee 10000000000 20000000000 1070 1090 1100 0014dedfd406c591aa221a047a260107f877da92fec5 055539eb36abcaaf127c63ae20e3d049cd28d0f1fe569df84da3aedb018ca1bf+ x, y1 l* |, H/ f; ~. I
// 取现合约
./equity FixedLimitProfit --instance c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee 10000000000 20000000000 1090 1100 0014dedfd406c591aa221a047a260107f877da92fec5 055539eb36abcaaf127c63ae20e3d049cd28d0f1fe569df84da3aedb018ca1bf
发布合约交易
发布合约交易即将资产锁定到合约中。由于目前无法在比原的dashboard上构造合约交易,所以需要借助外部工具来发送合约交易,比如postman。按照上述示意图所示,项目方需要发布1000个储蓄资产的储蓄合约和200个利息资产取现合约。假设项目方需要发布1000个储蓄资产(假如精度为8,那么1000个在比原链中表示为100000000000)的锁仓合约,那么他需要将对应数量的票据锁定在储蓄合约中,其交易模板如下:
{2 s% Q2 _7 k- j( b* n0 W! }% ?5 Z
"base_transaction": null,: \2 R6 x! ~ y" B: h, o9 x5 |
"actions": [7 d. v- ^$ W8 }" u: H8 g! ]
{
"account_id": "0ILGLSTC00A02",
"amount": 20000000,
"asset_id": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"type": "spend_account"3 x5 L( d6 A0 C" o7 b7 p9 `
},
{
"account_id": "0ILGLSTC00A02",4 [: o5 `+ e9 M' Y8 p, ]" i
"amount": 100000000000,1 o% i; I) ]) r. U
"asset_id": "13016eff73ffb7539a69e122f80f5c1cc94446773ac3f64dec290429f87e73b3",
"type": "spend_account" `. ]! h4 T$ b5 N5 _, N7 Q4 }
},
{8 v+ {# ^ o7 [+ y5 o
"amount": 100000000000," w0 P: c( ?( Y4 @6 _7 b
"asset_id": "13016eff73ffb7539a69e122f80f5c1cc94446773ac3f64dec290429f87e73b3",+ D5 L) H' X& m0 H
"control_program": "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",
"type": "control_program"8 q# j' b' t) ^$ U" ~3 ?. a& j8 E$ l
}
],
"ttl": 0,: V) h5 U$ B5 u7 y$ s) R
"time_range": 1521625823
}: p% A$ q! @2 n0 ] U B+ B/ E
合约交易成功后,合约control_program对应的UTXO将会被所有用户查询到,使用比原链的接口list-unspent-outputs即可查询。
此外,开发者需要存储一下合约UTXO的assetID和program,以便在DAPP的前端页面的config配置文件和bufferserver缓冲服务器中调用。如上所示:1 g) p2 u9 F6 c0 N; x) R3 v
// 储蓄合约
assetID:13016eff73ffb7539a69e122f80f5c1cc94446773ac3f64dec290429f87e73b3
program: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# A6 i+ V$ L0 q- V( r
// 取现合约
assetID:c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee Q! d! G. ?' [2 N8 F* z5 a( y: o5 B3 a
program: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 y e; \9 E8 ?; |0 H
本期的比原储蓄分红合约就介绍在这里,下一期我们将详细介绍如何基于该合约开发dapp应用