import struct
import hashlib

def readblocks(filename):
	f = open(filename, "rb")
	while True:
		try:
			magic = f.read(4)
			if magic != "\xf9\xbe\xb4\xd9":
				break
			blklen = struct.unpack("<i", f.read(4))[0]
			if blklen < 80:
				break
			blkdata = f.read(blklen)
			if len(blkdata) != blklen:
				break
		except:
			break
		blkhash = hashlib.sha256(hashlib.sha256(blkdata[:80]).digest()).digest()
		print blkhash.encode("hex"), blkdata[:80].encode("hex")
	f.close()

readblocks("blk0001.dat")