sign

The sign method calculates an Jumbochain specific signature with: sign(keccak256("\x19Jumbochain Signed Message:\n" + len(message) + message))).

By adding a prefix to the message makes the calculated signature recognisable as an Jumbochain specific signature. This prevents misuse where a malicious DApp can sign arbitrary data (e.g. transaction) and use the signature to impersonate the victim.

note

the address to sign with must be unlocked.

Returns code at a given address.

Parameters

account,message

DATA, 20 Bytes

address

DATA, N Bytes

message to sign

Returns

DATA

signature

Requests

C#

var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Post, "https://testnode.jumbochain.org");
var content = new StringContent("{\n\t\"jsonrpc\":\"2.0\",\n\t\"method\":\"jumbo_sign\",\n\t\"params\":[\n\t\t\"0x9b2055d370f73ec7d8a03e965129118dc8f5bf83\", \n\t\t\"0xdeadbeaf\"\n\t],\n\t\"id\":1\n}", null, "application/json");
request.Content = content;
var response = await client.SendAsync(request);
response.EnsureSuccessStatusCode();
Console.WriteLine(await response.Content.ReadAsStringAsync());

cURL

curl --location 'https://testnode.jumbochain.org' \
--header 'Content-Type: application/json' \
--data '{
	"jsonrpc":"2.0",
	"method":"jumbo_sign",
	"params":[
		"0x9b2055d370f73ec7d8a03e965129118dc8f5bf83",
		"0xdeadbeaf"
	],
	"id":1
}'

HTTP

OkHttpClient client = new OkHttpClient().newBuilder()
  .build();
MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\n\t\"jsonrpc\":\"2.0\",\n\t\"method\":\"jumbo_sign\",\n\t\"params\":[\n\t\t\"0x9b2055d370f73ec7d8a03e965129118dc8f5bf83\", \n\t\t\"0xdeadbeaf\"\n\t],\n\t\"id\":1\n}");
Request request = new Request.Builder()
  .url("https://testnode.jumbochain.org")
  .method("POST", body)
  .addHeader("Content-Type", "application/json")
  .build();
Response response = client.newCall(request).execute();

Java

const axios = require("axios");
let data = JSON.stringify({
  jsonrpc: "2.0",
  method: "jumbo_sign",
  params: ["0x9b2055d370f73ec7d8a03e965129118dc8f5bf83", "0xdeadbeaf"],
  id: 1,
});

let config = {
  method: "post",
  maxBodyLength: Infinity,
  url: "https://testnode.jumbochain.org",
  headers: {
    "Content-Type": "application/json",
  },
  data: data,
};

axios
  .request(config)
  .then((response) => {
    console.log(JSON.stringify(response.data));
  })
  .catch((error) => {
    console.log(error);
  });

NodeJs

import requests
import json

url = "https://testnode.jumbochain.org"

payload = json.dumps({
  "jsonrpc": "2.0",
  "method": "jumbo_sign",
  "params": [
    "0x9b2055d370f73ec7d8a03e965129118dc8f5bf83",
    "0xdeadbeaf"
  ],
  "id": 1
})
headers = {
  'Content-Type': 'application/json'
}

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)

Python

const myHeaders = new Headers();
myHeaders.append("Content-Type", "application/json");

const raw = JSON.stringify({
  jsonrpc: "2.0",
  method: "jumbo_sign",
  params: ["0x9b2055d370f73ec7d8a03e965129118dc8f5bf83", "0xdeadbeaf"],
  id: 1,
});

const requestOptions = {
  method: "POST",
  headers: myHeaders,
  body: raw,
  redirect: "follow",
};

fetch("https://testnode.jumbochain.org", requestOptions)
  .then((response) => response.text())
  .then((result) => console.log(result))
  .catch((error) => console.error(error));

Javascript

package main

import (
  "fmt"
  "strings"
  "net/http"
  "io/ioutil"
)

func main() {

  url := "https://testnode.jumbochain.org"
  method := "POST"

  payload := strings.NewReader(`{
	"jsonrpc":"2.0",
	"method":"jumbo_sign",
	"params":[
		"0x9b2055d370f73ec7d8a03e965129118dc8f5bf83",
		"0xdeadbeaf"
	],
	"id":1
}`)

  client := &http.Client {
  }
  req, err := http.NewRequest(method, url, payload)

  if err != nil {
    fmt.Println(err)
    return
  }
  req.Header.Add("Content-Type", "application/json")

  res, err := client.Do(req)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer res.Body.Close()

  body, err := ioutil.ReadAll(res.Body)
  if err != nil {
    fmt.Println(err)
    return
  }
  fmt.Println(string(body))
}