Calculate a valid pos reward account address

research/pos/main.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/robvanmieghem/misc/bitcoin"
+	"golang.org/x/crypto/blake2b"
+)
+
+func main() {
+	wantedSS58Address := "5CNposRewardAccount11111111111111111111111111111"
+	decoded := bitcoin.DecodeBase58(wantedSS58Address)
+	fmt.Println("wanted SS58:", wantedSS58Address)
+	fmt.Printf("base58 decoded: %x\n", decoded)
+	//last2 bytes should be the checksum
+	checksumLength := 2
+	addressBytes := decoded[1 : len(decoded)-checksumLength]
+	fmt.Printf("Public key: %x\n", addressBytes)
+	checksumPrefix := []byte("SS58PRE")
+	addressFormat := append([]byte{decoded[0]}[:], addressBytes[:]...)
+	checksum, _ := blake2b.New(64, []byte{})
+	w := append(checksumPrefix[:], addressFormat[:]...)
+	_, err := checksum.Write(w)
+	if err != nil {
+		panic(err)
+	}
+
+	h := checksum.Sum(nil)
+	b := append(addressFormat[:], h[:checksumLength][:]...)
+	validAddress := bitcoin.EncodeBase58(b)
+	fmt.Println("Valid SS58:", validAddress)
+}

research/pos/pos.md

@@ -50,4 +50,6 @@ Besides the fact that this is very clear, no private key that can leak or kept s
 The Base58 alphabet consists of the following characters:
 123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz
 
-`NposRewardPoolAccount11....` should as such be possible, prefixed with the network type and the checksum at the end that should match according to the [SS58 format](https://docs.substrate.io/v3/advanced/ss58/).
+`NposRewardAccount11....` should as such be possible, prefixed with the network type and the checksum at the end that should match according to the [SS58 format](https://docs.substrate.io/v3/advanced/ss58/).
+The main.go program was used to decode the wanted adress, calculate the correct checksum and encode it again.
+The result is the `5CNposRewardAccount11111111111111111111111111FSU` address