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Basic Rules

  1. The signature is generated using the Ed25519 cryptographic signature scheme on a formatted string.
  2. All fields are separated by underscore _, even if the field is empty.
  3. All sign message characters are lowercase.

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Sign Message Format

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Onramp (Buy)

{amount}_{callback}_{chain_id}_{currency}_{recipient}_{reference_no}_{token_address}

​
Offramp (Sell)

{amount}_{callback}_{chain_id}_{currency}_{bank_bin_code}_{bank_account_number}_{token_address}

​
Example

package main

import (
    "crypto/ed25519"
    "encoding/base64"
    "strings"
)

var sampleSignKey = "Qd2XliU6/I6YD3OELdeBQ57z6Q9/OHGBTjCNVLB8s/1KpvoU6aiuuBTgQ72IW/yA0aYYnfbCX31zhJKsPnRE5Q=="

func sign(msg string) string {
    signKey, _ := base64.StdEncoding.DecodeString(sampleSignKey)
    signature := ed25519.Sign(ed25519.PrivateKey(signKey), []byte(msg))
    return base64.StdEncoding.EncodeToString(signature)
}

func main() {
    params := []string{
        "1000000",  // amount
        "",         // callback
        "56",       // chain_id
        "",         // currency
        "0x0000000000000000000000000000000000000000", // recipient
        "rmtbPVEKwLzz27Qs51Jio",                      // reference_no
        "0x55d398326f99059ff775485246999027b3197955", // token_address
    }
    signMessage := strings.Join(params, "_")
    signMessage = strings.ToLower(signMessage)
    signature := sign(signMessage)
    println("Message:", signMessage)
    println("Signature:", signature)
}

​
Output

Message: 1000000__56__0x0000000000000000000000000000000000000000_rmtbpvekwlzz27qs51jio_0x55d398326f99059ff775485246999027b3197955
Signature: +EEox+pWc3dC854Av3eIzLbGthud0p2/xrosE9tcOHvLEji8uajyJzDwV95IFClhmCnCqPXtjQsZmYS0jrtgBw==
Remember to convert the entire sign message to lowercase before signing.