1.0.3
Script Hash: 0x74f2dc36a68fdc4682034178eb2220729231db76
CGAS Contract Address: AScKxyXmNtEnTLTvbVhNQyTJmgytxhwSnM
Known Issues: not found
1.0.2
Script Hash: 0x505663a29d83663a838eee091249abd167e928f5
CGAS Contract Address: Ae8AD6Rc3cvQapqttJcUTj9ULfLi2tLHmc
Known Issues: transfer method cannot be called by other contract
1.0.1
Script Hash: 0x9121e89e8a0849857262d67c8408601b5e8e0524
CGAS Contract Address: AK4LdT5ZXR9DQZjfk5X6Xy79mE8ad8jKAW
Known Issues: transferAPP method naming not canonical
It is recommended to use the latest version, if you have already used the old version, do not worry, you can refund CGAS to GAS and transfer GAS to the latest version contract. the old version contract will not cause asset loss.
CGAS refer to NEP-5 contract assets issued by NGD (NEO Global Development). CGAS can be exchanged for GAS at a 1:1 ratio and are fully refundable. The contract aims to map global assets GAS for the benefit of its internal transfer using the method of contract invocation.
Methods defined in NEP-5 standard:
| Methods | Parameters | Return value | Descriptions |
|---|---|---|---|
| balanceOf | byte[] account | int | Get the CGAS balance of an account. The return value is the actual amount x 10⁸. |
| decimals | --- | int | Get the decimals of CGAS. The return value is constant 8. |
| name | --- | string | Get the contract name. The return value is constant NEP5 GAS. |
| symbol | --- | string | Get the contract symbol. The return value is constant CGAS. |
| totalSupply | --- | int | Get the total supply of CGAS. The return value is the actual amount × 10⁸. Given that CGAS is exchanged for GAS at a 1:1 ratio, the GAS amount retrieved from the contract address is equal to the total supply of CGAS. |
| transfer | byte[] from, byte[] to, int amount | bool | A transfer method that transfers CGAS from the sender account to the recipient account. The transfer value is the "amount"; "from" and "to" are script hash value and "amount" is the actual transfer amount × 10⁸. This method supports both user invocation and contract invocation. |
Additional methods other than NEP-5 methods used to support GAS-CGAS swap:
| Methods | Parameters | Return value | Descriptions |
|---|---|---|---|
| getRefundTarget | byte[] txId | byte[] | Get the owner of the UTXO pending refund; the parameter is the TxId of the UTXO (confirm that a UTXO consists of TxId and output index; the output index takes the default value of 0); the return value is the account the UTXO is refunded to, whose owner can set the UTXO as a transaction input and send GAS from the CGAS address to his/her account. |
| getTxInfo | byte[] txId | TransferInfo | Get detailed transfer info under a TxId. TxInfo will be recorded under the following 4 instructions: mintTokens, refund, transfer, transferAPP. |
| mintTokens | --- | bool | A mintTokens method for CGAS users, who can transfer GAS to CGAS contract address by constructing InvocationTransaction and convert GAS to CGAS by invoking mintTokens method. Upon successful invocation, CGAS in the equal value of the GAS will be added to the user's asset account. NOTE |
| refund | byte[] from | bool | It takes two steps to claim CGAS and convert it to GAS. First, construct an InvocationTransaction, including GAS transfer within the same CGAS address (the transfer amount should be the GAS amount users expect to get refunded) to invoke the refund method (set the parameter as the Script Hash of the refund account). Upon successful invocation, CGAS in the equal amount of the refunded GAS will be automatically destroyed and the No.0 output of the transaction will be marked with the ownership of the user. Second, the user may construct a transaction and set the UTXO marked in the first step as a transaction input and his/her account as the transaction output to get GAS from the CGAS address. |
| supportedStandards | --- | string | NEP-10 standard for return contract; the return value is constant {"NEP-5", "NEP-7", "NEP-10"}. |
Notification defined in NEP-5 standard:
| Notification | Parameters | Descriptions |
|---|---|---|
| transfer | byte[] from, byte[] to, int value | Notification contains the three elements of transfer: sender (from), recipient (to) and transfer value (value). CGAS is the default type of assets for transfer. |
Other notifications realized in the contract:
| Notification | Parameters | Descriptions |
|---|---|---|
| refund | byte[] txid, byte[] who | Notification contains two elements of transfer: UTXO pending refund (txid) and Script Hash of refund account (who). |
[NOTE]
In mintTokens, please note that the total count of InvocationTransaction Inputs and Outputs should not be more than 60, otherwise the cost of execution will exceed the free limit of 10 GAS. If a large number of GAS UTXO need to be exchange to CGAS, it is recommended to make a regular transfer, UTXO merge, and then Minttokens operation.
The following are the trading structures of mintTokens and refund and the application Log for developers' reference.
mintTokens transaction:
[NOTE]
Type: InvocationTransaction
Input: from user's address
Output: to CGAS contract address
Script: invoke mintTokens methods in CGAS contract
{
"jsonrpc": "2.0",
"id": 1,
"result": {
"txid": "0x48bd784d0ed6000cba64d0e303117e4c10081e3268afcf3b07e8b353a7594772",
"size": 246,
"type": "InvocationTransaction",
"version": 1,
"attributes": [],
"vin": [
{
"txid": "0x5918258bb67ee292358f8780d6b86e8fcd825bdde623429e4e547a2f9e496cf8",
"vout": 0
}
],
"vout": [
{
"n": 0,
"asset": "0x602c79718b16e442de58778e148d0b1084e3b2dffd5de6b7b16cee7969282de7",
"value": "10",
"address": "AScKxyXmNtEnTLTvbVhNQyTJmgytxhwSnM"
}
],
"sys_fee": "0",
"net_fee": "0",
"scripts": [
{
"invocation": "408e13fc267d69ca1c8463ac8bc3f266343ee0661ef85e9fa66fe986dc787f14fc6c13279bc90883297e186ca65d918ccdcf407497c0de1de9573e9a519a4f9aa5",
"verification": "21037ebe29fff57d8c177870e9d9eecb046b27fc290ccbac88a0e3da8bac5daa630dac"
}
],
"script": "000a6d696e74546f6b656e736776db3192722022eb7841038246dc8fa636dcf274f16658600e9b9af88bcb",
"gas": "0",
"blockhash": "0xafb5b19021e1b57e7d64deb9d99bedabb0e40fdc3393d6c58c324730c0061aae",
"confirmations": 2,
"blocktime": 1536906512
}
}mintTokens application log:
{
"txid": "0x48bd784d0ed6000cba64d0e303117e4c10081e3268afcf3b07e8b353a7594772",
"vmstate": "HALT, BREAK",
"gas_consumed": "4.648",
"stack": [],
"notifications": [{
"contract": "0x74f2dc36a68fdc4682034178eb2220729231db76",
"state": {
"type": "Array",
"value": [{
"type": "ByteArray",
"value": "7472616e73666572"
}, {
"type": "ByteArray",
"value": ""
}, {
"type": "ByteArray",
"value": "e8e3ce08268d16d867101feaf8c0ea130a923aba"
}, {
"type": "Integer",
"value": "1000000000"
}]
}
}]
}refund 1st step transaction:
[NOTE]
Type: InvocationTransaction
Input: from CGAS contract address
Output: to CGAS contract address (same address to input)
Script: invoke refund methods in CGAS contract, and set the parameter as the Script Hash of the refund account
Scripts: need 2 witnesses: 1、witness of CGAS; 2、witness of user (additional witness)
{
"jsonrpc": "2.0",
"id": 1,
"result": {
"txid": "0x306daa4ab2b2ef73ff4fd8f9121fc926f5e21653080602b6841ad3f17f80777c",
"size": 7205,
"type": "InvocationTransaction",
"version": 0,
"attributes": [
{
"usage": "Script",
"data": "e8e3ce08268d16d867101feaf8c0ea130a923aba"
}
],
"vin": [
{
"txid": "0x48bd784d0ed6000cba64d0e303117e4c10081e3268afcf3b07e8b353a7594772",
"vout": 0
}
],
"vout": [
{
"n": 0,
"asset": "0x602c79718b16e442de58778e148d0b1084e3b2dffd5de6b7b16cee7969282de7",
"value": "5",
"address": "AScKxyXmNtEnTLTvbVhNQyTJmgytxhwSnM"
},
{
"n": 1,
"asset": "0x602c79718b16e442de58778e148d0b1084e3b2dffd5de6b7b16cee7969282de7",
"value": "5",
"address": "AScKxyXmNtEnTLTvbVhNQyTJmgytxhwSnM"
}
],
"sys_fee": "0",
"net_fee": "0",
"scripts": [
{
"invocation": "520131",
"verification": 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},
{
"invocation": "404c53a9ca937470df9dcbbb71cf00e2b4d75761e4667ccfd820e40829887c4444c7911ed509e564b2bac30e41c92c43f7df2dd2a25ea1c8e2bc10aec3d3208251",
"verification": "21037ebe29fff57d8c177870e9d9eecb046b27fc290ccbac88a0e3da8bac5daa630dac"
}
],
"script": "14e8e3ce08268d16d867101feaf8c0ea130a923aba51c106726566756e646776db3192722022eb7841038246dc8fa636dcf274f1",
"gas": "0",
"blockhash": "0xd04d56259a6c92e290ab009e2062fbd078c3c371036d74dd745b379a4d55a899",
"confirmations": 14,
"blocktime": 1536907058
}
}refund 1st step application log:
{
"txid": "0x306daa4ab2b2ef73ff4fd8f9121fc926f5e21653080602b6841ad3f17f80777c",
"vmstate": "HALT, BREAK",
"gas_consumed": "5.582",
"stack": [],
"notifications": [{
"contract": "0x74f2dc36a68fdc4682034178eb2220729231db76",
"state": {
"type": "Array",
"value": [{
"type": "ByteArray",
"value": "7472616e73666572"
}, {
"type": "ByteArray",
"value": "e8e3ce08268d16d867101feaf8c0ea130a923aba"
}, {
"type": "ByteArray",
"value": ""
}, {
"type": "Integer",
"value": "500000000"
}]
}
}, {
"contract": "0x74f2dc36a68fdc4682034178eb2220729231db76",
"state": {
"type": "Array",
"value": [{
"type": "ByteArray",
"value": "726566756e64"
}, {
"type": "ByteArray",
"value": "7c77807ff1d31a84b60206085316e2f526c91f12f9d84fff73efb2b24aaa6d30"
}, {
"type": "ByteArray",
"value": "e8e3ce08268d16d867101feaf8c0ea130a923aba"
}]
}
}]
}refund 2nd step transaction:
[NOTE]
Type: ContractTransaction
Input: from CGAS contract address
Output: to user's address
Scripts: witness of CGAS
{
"jsonrpc": "2.0",
"id": 1,
"result": {
"txid": "0x595b1dce00e6a7c72e2650573b8b82831128428bd445830f226c1390bca8b45d",
"size": 6969,
"type": "ContractTransaction",
"version": 0,
"attributes": [],
"vin": [
{
"txid": "0x306daa4ab2b2ef73ff4fd8f9121fc926f5e21653080602b6841ad3f17f80777c",
"vout": 0
}
],
"vout": [
{
"n": 0,
"asset": "0x602c79718b16e442de58778e148d0b1084e3b2dffd5de6b7b16cee7969282de7",
"value": "5",
"address": "Ad1HKAATNmFT5buNgSxspbW68f4XVSssSw"
}
],
"sys_fee": "0",
"net_fee": "0",
"scripts": [
{
"invocation": "520131",
"verification": 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}
],
"blockhash": "0x41590a481d67f2f52c2aaa6ca4942c17b1afc36e30cf417e7980011cd75ce905",
"confirmations": 1,
"blocktime": 1536907793
}
}refund 2nd step application log:
refund 2nd step is a ContractTransaction, so no application log.
CGAS 是由 NGD（NEO Global Development）发布的符合 NEP-5 规范的合约资产，CGAS 可由 GAS 一比一地对换，并且支持退回操作。该合约的目的是将 GAS 进行全局资产的合约映射，使全局资产 GAS 可以方便地在合约内部流转，支持由合约调用转账。
NEP-5 规范中的方法：
| 方法 | 参数 | 返回值 | 描述 |
|---|---|---|---|
| balanceOf | byte[] account | int | 获得某个账户 CGAS 的余额，返回结果为真实值 × 10⁸ |
| decimals | --- | int | 获得 CGAS 精度，返回值为常量 8 |
| name | --- | string | 获得合约名称，返回值为常量 NEP5 GAS |
| symbol | --- | string | 获得合约符号，返回值为常量 CGAS |
| totalSupply | --- | int | 获得 CGAS 总发行量，返回结果为真实值 × 10⁸。因为 CGAS 与 GAS 为一比一兑换，所以合约地址中 GAS 的数量等于 CGAS 的总发行量 |
| transfer | byte[] from, byte[] to, int amount | bool | 转账方法，将 CGAS 从发送者（from）账户，转到接收者（to）账户，转账金额为 amount；from 与 to 为 Script Hash，amount 为实际转账金额 × 10⁸。该方法同时支持用户调用和合约调用。 |
该合约为了支持 GAS 与 CGAS 互换，除了满足 NEP-5 规范中的方法其它方法：
| 方法 | 参数 | 返回值 | 描述 |
|---|---|---|---|
| getRefundTarget | byte[] txId | byte[] | 获得某个 UTXO 是谁待退回的，参数为 UTXO 中的交易 ID（确定一个 UTXO 由 txId 和 output 索引共同完成，这里 output 索引默认为 0），返回值为这个 UTXO 的退回者，他可以将这个 UTXO 作为交易输入，将 GAS 从 CGAS 地址中取走。 |
| getTxInfo | byte[] txId | TransferInfo | 获得某个交易 ID 的详细转账信息，在以下 4 种情况中可记录 TxInfo：mintTokens, Refund, transfer, transferAPP。 |
| mintTokens | --- | bool | CGAS 的铸币方法。用户通过发起 InvocationTransaction，将 GAS 转给 CGAS 合约地址，并且调用 mintTokens 完成 GAS 到 CGAS 的转换工作。合约调用成功后，用户资产中将会增加与兑换的 GAS 数额相等的 CGAS。注意事项 |
| refund | byte[] from | bool | 用户将 CGAS 提取，变成 GAS 总共分两步。第一步，发起一笔 InvocationTransaction 其中包含一笔从 CGAS 地址到 CGAS 地址的 GAS 转账（转账金额为用户想退回的 GAS 的数量），并调用 refund 方法（参数为退回者的 Script Hash）。合约调用成功后，将自动销毁与退回数量相等的 CGAS，并把该交易的第 0 号 output 标记为所属于该用户。第二步，用户构造一个交易将第一步标记过的 UTXO 作为交易输入，交易输出为用户自己的地址，从而将 GAS 从 CGAS 地址中取走。 |
| supportedStandards | --- | string | NEP-10 规范，返回合约所支持的 NEP 标准，返回值为常量："{"NEP-5", "NEP-7", "NEP-10"}" |
NEP-5 规范中的通知：
| 通知 | 参数 | 描述 |
|---|---|---|
| transfer | byte[] from, byte[] to, int value | 通知中包含转账的 3 个要素，发送者 （from），接收者 （to） ，转账金额 （value）, 转账资产默认为 CGAS |
该合约实现的其它通知：
| 通知 | 参数 | 描述 |
|---|---|---|
| refund | byte[] txid, byte[] who | 通知中包含转账的 2 个要素，待退回的 UTXO（txid），退回者的 Script Hash（who） |
[注意]
在 mintTokens 的时候请注意，InvocationTransaction 的 Inputs 和 Output 加起来不应该超过60个，否则在执行时所需的手续费会超过 10 GAS 的免费额度。如果有大量 GAS 的 UTXO 需要换成 CGAS，建议先进行一个普通转账，将 UTXO 合并，然后再进行 mintTokens 操作。
以下是 mintTokens 和 refund 的交易结构以及 Application Log，供开发者参考。
mintTokens 交易结构:
[说明]
Type: InvocationTransaction
Input: 来自用户的地址
Output: CGAS 合约地址
Script: 调用 CGAS 合约的 mintTokens 方法
{
"jsonrpc": "2.0",
"id": 1,
"result": {
"txid": "0x48bd784d0ed6000cba64d0e303117e4c10081e3268afcf3b07e8b353a7594772",
"size": 246,
"type": "InvocationTransaction",
"version": 1,
"attributes": [],
"vin": [
{
"txid": "0x5918258bb67ee292358f8780d6b86e8fcd825bdde623429e4e547a2f9e496cf8",
"vout": 0
}
],
"vout": [
{
"n": 0,
"asset": "0x602c79718b16e442de58778e148d0b1084e3b2dffd5de6b7b16cee7969282de7",
"value": "10",
"address": "AScKxyXmNtEnTLTvbVhNQyTJmgytxhwSnM"
}
],
"sys_fee": "0",
"net_fee": "0",
"scripts": [
{
"invocation": "408e13fc267d69ca1c8463ac8bc3f266343ee0661ef85e9fa66fe986dc787f14fc6c13279bc90883297e186ca65d918ccdcf407497c0de1de9573e9a519a4f9aa5",
"verification": "21037ebe29fff57d8c177870e9d9eecb046b27fc290ccbac88a0e3da8bac5daa630dac"
}
],
"script": "000a6d696e74546f6b656e736776db3192722022eb7841038246dc8fa636dcf274f16658600e9b9af88bcb",
"gas": "0",
"blockhash": "0xafb5b19021e1b57e7d64deb9d99bedabb0e40fdc3393d6c58c324730c0061aae",
"confirmations": 2,
"blocktime": 1536906512
}
}mintTokens application log:
{
"txid": "0x48bd784d0ed6000cba64d0e303117e4c10081e3268afcf3b07e8b353a7594772",
"vmstate": "HALT, BREAK",
"gas_consumed": "4.648",
"stack": [],
"notifications": [{
"contract": "0x74f2dc36a68fdc4682034178eb2220729231db76",
"state": {
"type": "Array",
"value": [{
"type": "ByteArray",
"value": "7472616e73666572"
}, {
"type": "ByteArray",
"value": ""
}, {
"type": "ByteArray",
"value": "e8e3ce08268d16d867101feaf8c0ea130a923aba"
}, {
"type": "Integer",
"value": "1000000000"
}]
}
}]
}refund 第一步时的交易结构:
[说明]
Type: InvocationTransaction
Input: 来自 CGAS 合约地址
Output: 转到 CGAS 合约地址 (与 input 相同)
Script: 调用 refund 方法，设置参数为退回者的 Script Hash
Scripts: 需要两个 witness: 1、CGAS 合约的 witness; 2、用户的 witness（附加见证人）
{
"jsonrpc": "2.0",
"id": 1,
"result": {
"txid": "0x306daa4ab2b2ef73ff4fd8f9121fc926f5e21653080602b6841ad3f17f80777c",
"size": 7205,
"type": "InvocationTransaction",
"version": 0,
"attributes": [
{
"usage": "Script",
"data": "e8e3ce08268d16d867101feaf8c0ea130a923aba"
}
],
"vin": [
{
"txid": "0x48bd784d0ed6000cba64d0e303117e4c10081e3268afcf3b07e8b353a7594772",
"vout": 0
}
],
"vout": [
{
"n": 0,
"asset": "0x602c79718b16e442de58778e148d0b1084e3b2dffd5de6b7b16cee7969282de7",
"value": "5",
"address": "AScKxyXmNtEnTLTvbVhNQyTJmgytxhwSnM"
},
{
"n": 1,
"asset": "0x602c79718b16e442de58778e148d0b1084e3b2dffd5de6b7b16cee7969282de7",
"value": "5",
"address": "AScKxyXmNtEnTLTvbVhNQyTJmgytxhwSnM"
}
],
"sys_fee": "0",
"net_fee": "0",
"scripts": [
{
"invocation": "520131",
"verification": 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},
{
"invocation": "404c53a9ca937470df9dcbbb71cf00e2b4d75761e4667ccfd820e40829887c4444c7911ed509e564b2bac30e41c92c43f7df2dd2a25ea1c8e2bc10aec3d3208251",
"verification": "21037ebe29fff57d8c177870e9d9eecb046b27fc290ccbac88a0e3da8bac5daa630dac"
}
],
"script": "14e8e3ce08268d16d867101feaf8c0ea130a923aba51c106726566756e646776db3192722022eb7841038246dc8fa636dcf274f1",
"gas": "0",
"blockhash": "0xd04d56259a6c92e290ab009e2062fbd078c3c371036d74dd745b379a4d55a899",
"confirmations": 14,
"blocktime": 1536907058
}
}refund 第一步的 application log:
{
"txid": "0x306daa4ab2b2ef73ff4fd8f9121fc926f5e21653080602b6841ad3f17f80777c",
"vmstate": "HALT, BREAK",
"gas_consumed": "5.582",
"stack": [],
"notifications": [{
"contract": "0x74f2dc36a68fdc4682034178eb2220729231db76",
"state": {
"type": "Array",
"value": [{
"type": "ByteArray",
"value": "7472616e73666572"
}, {
"type": "ByteArray",
"value": "e8e3ce08268d16d867101feaf8c0ea130a923aba"
}, {
"type": "ByteArray",
"value": ""
}, {
"type": "Integer",
"value": "500000000"
}]
}
}, {
"contract": "0x74f2dc36a68fdc4682034178eb2220729231db76",
"state": {
"type": "Array",
"value": [{
"type": "ByteArray",
"value": "726566756e64"
}, {
"type": "ByteArray",
"value": "7c77807ff1d31a84b60206085316e2f526c91f12f9d84fff73efb2b24aaa6d30"
}, {
"type": "ByteArray",
"value": "e8e3ce08268d16d867101feaf8c0ea130a923aba"
}]
}
}]
}refund 第二步的交易结构:
[说明]
Type: ContractTransaction
Input: 来自 CGAS 合约地址
Output: 转到用户自己的地址
Scripts: CGAS 合约的 witness
{
"jsonrpc": "2.0",
"id": 1,
"result": {
"txid": "0x595b1dce00e6a7c72e2650573b8b82831128428bd445830f226c1390bca8b45d",
"size": 6969,
"type": "ContractTransaction",
"version": 0,
"attributes": [],
"vin": [
{
"txid": "0x306daa4ab2b2ef73ff4fd8f9121fc926f5e21653080602b6841ad3f17f80777c",
"vout": 0
}
],
"vout": [
{
"n": 0,
"asset": "0x602c79718b16e442de58778e148d0b1084e3b2dffd5de6b7b16cee7969282de7",
"value": "5",
"address": "Ad1HKAATNmFT5buNgSxspbW68f4XVSssSw"
}
],
"sys_fee": "0",
"net_fee": "0",
"scripts": [
{
"invocation": "520131",
"verification": 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}
],
"blockhash": "0x41590a481d67f2f52c2aaa6ca4942c17b1afc36e30cf417e7980011cd75ce905",
"confirmations": 1,
"blocktime": 1536907793
}
}refund 第二步的 application log:
refund 第二步为普通的合约交易，没有 application log.