Construct a QR code for a payment request with the following details:

• Bitcoin address: "mrCDrCybB6J1vRfbwM5hemdJz73FwDBC8r"
• Amount: "0.00001"
• Label: "Blips and Chitz"
• Message: "Purchase tokens at Blips and Chitz"

Scan the QR code with a QR code reader to verify its contents.

Reading: BIP-21 is a short proposal that describes the URI scheme used in payment request QR codes.

Repeatedly compute the SHA256 hash of the following simplified header (in JSON), incrementing the nonce in every iteration, until the resulting hash starts with three consecutive zeros.

{
  "height": 0,
  "version": 1,
  "merkleroot": "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
  "nonce" : 0
}