Bytom信息上链教程
原创
比原项目仓库：
Github地址：https://github.com/Bytom/bytom
Gitee地址：https://gitee.com/BytomBlockchain/bytom
##用比原链（Bytom）实现信息上链
很多了解比原链的都知道，比原链是专注信息和数字资产在链上交互和流转的公链项目，信息上链不是比原链核心能力，所以并没有在钱包端做一个功能入口，但是比原链提供了相关的接口可以将一些信息写到链上去。
那如何实现信息上链呢？使用特殊的Retire操作，这个操作可以进行销毁资产的操作，但因为其可以附带信息，所以就可以实现信息上链的功能。
请往下看，也用postman请求演示，然后用golang写了一个接口的demo, 在用golang代码实现之前，我们先要做一些准备工作。
- 首先确保自己在本地已经搭建好了比原的节点，如果你还没有搭建好节点，请参考开发文档：https://docs.bytom.io/mydoc_build_environment.cn.html
- 确保自己账户是有足够BTM测试币，如果没有可以去比原链水龙头领取BTM测试币,领取地址：
http://test.blockmeta.com/faucet.php
- 发行自己的资产，参考：http://8btc.com/forum.php?mod=viewthread&tid=242940&extra=
- 信息上链的本质就是其实就是创建并发送一笔交易，我们都知道通过api发起交易主要有三个步骤，先 build → sign → submit，分别对应的api是 build-transaction、sign-transaction、submit-transaction。用postman请求过程如下：
请求build-transaction接口:
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请求参数：
{"base_transaction": null,"actions": [{ "account_id": "0KTCS3R5G0A02", "amount": 10000000, "asset_id": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "type": "spend_account"}, { "account_id": "0KTCS3R5G0A02", "amount": 100, "asset_id": "608037f96e8d1613d900c67a0730cc90e2a03311fb7d091588f7eb551a6103cd", "type": "spend_account"}, { "account_id": "0KTCS3R5G0A02", "amount": 100, "asset_id": "608037f96e8d1613d900c67a0730cc90e2a03311fb7d091588f7eb551a6103cd", "arbitrary": "77656c636f6d65efbc8ce6aca2e8bf8ee69da5e588b0e58e9fe5ad90e4b896e7958c", "type": "retire"}],"ttl": 0,"time_range": 1521625823}请求sign-transaction接口：
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请求参数：
{"password": "huangxinglong123","transaction": { "allow_additional_actions": false, "local": true, "raw_transaction": "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", "signing_instructions": [{ "position": 0, "witness_components": [{ "keys": [{ "derivation_path": [ "0000002c", "00000099", "0100000000000000", "0100000000000000", "4600000000000000" ], "xpub": "1c03161a08a4dbb7df153815a28f733fec1ac7579f954c4834e5ce9f0ad8deb260ecb2066a8623b69aa936f5798f4dcb9572bc476f2c8171953ce054d58a759f" }], "quorum": 1, "signatures": null, "type": "raw_tx_signature" }, { "type": "data", "value": "4f089176a5bca95ec9227b8a87dfec947c59453805bf46d3f5a18f8032255b5a" }] }, { "position": 1, "witness_components": [{ "keys": [{ "derivation_path": [ "0000002c", "00000099", "0100000000000000", "0100000000000000", "4700000000000000" ], "xpub": "1c03161a08a4dbb7df153815a28f733fec1ac7579f954c4834e5ce9f0ad8deb260ecb2066a8623b69aa936f5798f4dcb9572bc476f2c8171953ce054d58a759f" }], "quorum": 1, "signatures": null, "type": "raw_tx_signature" }, { "type": "data", "value": "67512f9250f559699e32c72c8af29096b1556af145f6ecc0c306e6acc88bbfaa" }] }]}}请求submit-transaction接口：
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请求参数：
{ "raw_transaction": "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" }响应参数：
{"status": "success","data": { "tx_id": "5ef27b930646d468bbb436d3406972ff201aa63702518f777e31dd6a2147dddc" }}用上面返回的tx_id去比原的浏览器中去查看交易详情，就可以查看到我们上传的数据
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参考代码：
package mainimport ("bytes""encoding/json""fmt""io/ioutil""net/http")//build-transaction params//https://bytom.github.io/mydoc_RPC_call.cn.html#build-transactiontype BytomAccount struct {AccountId string `json:"account_id"`Amount int `json:"amount"`AssetId string `json:"asset_id"`//Arbitrary string `json:"arbitrary"`Type string `json:"type"`}type BytomAccount1 struct {AccountId string `json:"account_id"`Amount int `json:"amount"`AssetId string `json:"asset_id"`Arbitrary string `json:"arbitrary"`Type string `json:"type"`}type BaseTransaction struct{}type TransactionParams struct {BaseTransaction *BaseTransaction `json:"base_transaction"`Actions []interface{} `json:"actions"`Ttl int `json:"ttl"`TimeRange int `json:"time_range"`}//sign-transaction params//https://bytom.github.io/mydoc_RPC_call.cn.html#build-transactiontype Transaction struct {}type SignParams struct {Password string `json:"password"`Transaction Transaction `json:"transaction"`}//submit-transaction//https://bytom.github.io/mydoc_RPC_call.cn.html#build-transactiontype SubmitParams struct {RawTransaction string `json:"raw_transaction"`}type SubmitResponse struct {TxId string `json:"tx_id"`}func main() {account1, account2, account3 := BytomAccount{}, BytomAccount{}, BytomAccount1{}account1.AccountId = "0KTCS3R5G0A02"account1.Amount = 10000000account1.AssetId = "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"account1.Type = "spend_account"account2.AccountId = "0KTCS3R5G0A02"account2.Amount = 100account2.AssetId = "608037f96e8d1613d900c67a0730cc90e2a03311fb7d091588f7eb551a6103cd"account2.Type = "spend_account"account3.AccountId = "0KTCS3R5G0A02"account3.Amount = 100account3.AssetId = "608037f96e8d1613d900c67a0730cc90e2a03311fb7d091588f7eb551a6103cd"account3.Arbitrary = "77656c636f6d65efbc8ce6aca2e8bf8ee69da5e588b0e58e9fe5ad90e4b896e7958c"account3.Type = "retire"//var arrayvar actions []interface{}//append three paramsarray_actions := append(actions, account1, account2, account3)transaction_params := &TransactionParams{}transaction_params.Actions = array_actionstransaction_params.Ttl = 0transaction_params.TimeRange = 1521625823//本地测试网节点//build-transactionport := "http://127.0.0.1:9888/build-transaction"value, err := SendTransactionRetire(transaction_params, port)if err != nil { fmt.Println("err:", err)}fmt.Println("build-transaction接口返回的参数:", value)//sign-transaction//...........//submit-transaction//...........}//send post requestfunc SendTransactionRetire(params *TransactionParams, port string) (v interface{}, err error) {//以本地测试网节点连接ParamsStr, err := json.Marshal(params)if err != nil { return nil, err}jsonStr := bytes.NewBuffer(ParamsStr)fmt.Println(jsonStr)req, err := http.NewRequest("POST", port, jsonStr)req.Header.Set("Content-Type", "application/json")req.Header.Add("Accept", "application/json")client := &http.Client{}resp, err := client.Do(req)if err != nil { panic(err)}defer resp.Body.Close()var bodyBytes []byteif resp.StatusCode == 200 { bodyBytes, err = ioutil.ReadAll(resp.Body) if err != nil { return nil, err }}return string(bodyBytes), nil}上面的代码只是build-transaction一个步骤，另外sign-transaction和submit-transaction请求需要自己去组织参数进行请求。请求完submit-transaction 获得返回的交易hash,去区块链浏览器上查看自己的上链信息，区块链浏览器地址：http://52.82.46.157:8082/。
好了，通过以上的4个步骤，我们就可以借助比原链实现信息上链。如果你有什么疑问或者不明白，请在我们的社区联系我们，https://github.com/Bytom/bytom。
原创声明：本文系作者授权腾讯云开发者社区发表，未经许可，不得转载。
如有侵权，请联系 cloudcommunity@tencent.com 删除。
原创声明：本文系作者授权腾讯云开发者社区发表，未经许可，不得转载。
如有侵权，请联系 cloudcommunity@tencent.com 删除。
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