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:
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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。' h! B: y" {% u8 q1 T/ ?' h% w& E* C
合约源代码4 X. ^6 q$ {4 @% f( y, ?1 r
// 储蓄合约 s z9 G+ a. [+ ]9 K+ I
import "./FixedLimitProfit"8 w5 C9 }+ }6 l, S0 I
contract FixedLimitCollect(assetDeposited: Asset,
totalAmountBill: Amount,& S! l$ I: r, b" f
totalAmountCapital: Amount,: _8 e! v- s9 c/ M0 B
dueBlockHeight: Integer,- ?; _* v* W9 g; W7 X- b. ^; C3 r
expireBlockHeight: Integer, [ M$ R1 O$ U1 Y# e$ `
additionalBlockHeight: Integer,
banker: Program,
bankerKey: PublicKey) locks billAmount of billAsset { M" E- t6 e% u s
clause collect(amountDeposited: Amount, saver: Program) {7 s$ L! M$ w( }$ z4 u2 i
verify below(dueBlockHeight)
verify amountDeposited 0 && sTotalAmountBill > 00 {4 U' U" u( T+ D$ I9 r, }
if amountDeposited
// 取现合约(本金加利息)
contract FixedLimitProfit(assetBill: Asset,
totalAmountBill: Amount,
totalAmountCapital: Amount,
expireBlockHeight: Integer,
additionalBlockHeight: Integer," ]/ F$ P& B- _
banker: Program,+ c }" k* I: ?$ \3 V3 s; n; _
bankerKey: PublicKey) locks capitalAmount of capitalAsset {6 b4 k2 W: V. ~6 ]/ J9 Y: L1 p
clause profit(amountBill: Amount, saver: Program) {
verify above(expireBlockHeight)5 N& q3 n$ l8 r
define sAmountBill: Integer = amountBill/100000000/ ^0 E# d2 V# d% j
define sTotalAmountBill: Integer = totalAmountBill/100000000
verify sAmountBill > 0 && sTotalAmountBill > 0 && amountBill 0 && gain
合约的源代码说明可以具体参考Equity合约介绍.
注意事项:
编译并实例化合约
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:* b7 D( S% [7 d8 v; s w1 C
assetDeposited :c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee: w' \4 |' H5 W3 g
totalAmountBill :100000000007 w1 O! q t+ O
totalAmountCapital :200000000005 M( l6 m+ s* p& ~! o
dueBlockHeight :1070+ B$ G% H4 [ {. Q: i( s
expireBlockHeight :1090
additionalBlockHeight :1100& L& s5 P% E- g5 X& @$ U
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。
实例化合约命令如下:
// 储蓄合约5 J: \8 W+ T& a( v
./equity FixedLimitCollect --instance c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee 10000000000 20000000000 1070 1090 1100 0014dedfd406c591aa221a047a260107f877da92fec5 055539eb36abcaaf127c63ae20e3d049cd28d0f1fe569df84da3aedb018ca1bf
// 取现合约# }3 X5 L3 v3 Q$ }3 J& x0 x
./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:
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"base_transaction": null,
"actions": [
{
"account_id": "0ILGLSTC00A02",. I% a9 Y9 \; F2 @3 D0 q
"amount": 20000000,) M1 K# n) c" \# J; Q7 z
"asset_id": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",) z9 y9 m8 u, I5 W8 C* U' F
"type": "spend_account"
},
{
"account_id": "0ILGLSTC00A02",
"amount": 100000000000,
"asset_id": "13016eff73ffb7539a69e122f80f5c1cc94446773ac3f64dec290429f87e73b3",4 S) h5 }) D' W }% q' L
"type": "spend_account"
},
{/ L& D# x, J% Z
"amount": 100000000000,
"asset_id": "13016eff73ffb7539a69e122f80f5c1cc94446773ac3f64dec290429f87e73b3",
"control_program": "20055539eb36abcaaf127c63ae20e3d049cd28d0f1fe569df84da3aedb018ca1bf160014dedfd406c591aa221a047a260107f877da92fec5024c04024204022e040500c817a8040500e40b540220c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee4d3b02597a642f0200005479cda069c35b797ca153795579a19a695a790400e1f5059653790400e1f505967c00a07c00a09a69c35b797c9f9161644d010000005b79c2547951005e79895d79895c79895b7989597989587989537a894caa587a649e0000005479cd9f6959790400e1f5059653790400e1f505967800a07800a09a5c7956799f9a6955797b957c96c37800a052797ba19a69c3787c9f91616487000000005b795479515b79c1695178c2515d79c16952c3527994c251005d79895c79895b79895a79895979895879895779895679890274787e008901c07ec1696399000000005b795479515b79c16951c3c2515d79c16963aa000000557acd9f69577a577aae7cac890274787e008901c07ec169515b79c2515d79c16952c35c7994c251005d79895c79895b79895a79895979895879895779895679895579890274787e008901c07ec169632a020000005b79c2547951005e79895d79895c79895b7989597989587989537a894caa587a649e0000005479cd9f6959790400e1f5059653790400e1f505967800a07800a09a5c7956799f9a6955797b957c96c37800a052797ba19a69c3787c9f91616487000000005b795479515b79c1695178c2515d79c16952c3527994c251005d79895c79895b79895a79895979895879895779895679890274787e008901c07ec1696399000000005b795479515b79c16951c3c2515d79c16963aa000000557acd9f69577a577aae7cac890274787e008901c07ec16951c3c2515d79c169633b020000547acd9f69587a587aae7cac747800c0",6 ]9 p4 K) U; x# \" q# {
"type": "control_program"
}3 x( q7 b- ~. e6 w. I
],
"ttl": 0,1 e4 f2 [4 V0 w6 W+ y- h8 K6 Z5 o5 p$ c
"time_range": 1521625823
}
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。) C$ U9 _* _+ s
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:
// 储蓄合约
assetID:13016eff73ffb7539a69e122f80f5c1cc94446773ac3f64dec290429f87e73b3
program: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 H* f B: E" [7 i; P) n
// 取现合约0 n5 B' i7 f# X: ^: ~
assetID:c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee
program: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
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