def test_retargetting(self):
z = '0000000000000000000000000000000000000000000000000000000000000000'
first = {
'version': 4,
'prev_block_hash': z,
'merkle_root': z,
'timestamp': 1269211443,
'bits': 0x18015ddc,
'nonce': 0,
'block_height': 0
}
blocks = [first]
chunk_bytes = bytes.fromhex(bc.serialize_header(first))
for n in range(1, 1000):
block = get_block(blocks[-1], 600, first['bits'])
blocks.append(block)
chunk_bytes += bytes.fromhex(bc.serialize_header(block))
chain = MyBlockchain()
# Get blocks every 2hrs now. Heights 1000 ... 1010 inclusive
for n in range(11):
block = get_block(blocks[-1], 2 * 3600, first['bits'])
blocks.append(block)
chunk_bytes += bytes.fromhex(bc.serialize_header(block))
chunk = bc.HeaderChunk(0, chunk_bytes)
self.assertEqual(chain.get_bits(block, chunk), first['bits'])
# Now we expect difficulty to decrease
# MTP(1010) is TimeStamp(1005), MTP(1004) is TimeStamp(999)
hdr = {'block_height': block['block_height'] + 1}
self.assertEqual(chain.get_bits(hdr, chunk), 0x1801b553)
def test_validate_solution(self):
header = {
'merkle_root':
'a0c38df01cd66ccd636c2917472002b90f40c69f177585793167c7c96cc00aea',
'bits':
0x207fffff,
'block_height':
24156,
'version':
536870912,
'timestamp':
1520027553,
'reserved':
'00000000000000000000000000000000000000000000000000000000',
'solution':
'269125e395b85db52eafd3b401615665ab0407b725253552073a1b6eefe092c20d02250024',
'nonce':
'0000b0e08b5b13938bcda848f480619e320ceeee9175aef1630e2a6a78f30005',
'prev_block_hash':
'42e56ff42ad233fa1444b4fbb23ea69e85a196ad4e4017292563ecef6561d59b'
}
n = 48
k = 5
header_bytes = bytes.fromhex(serialize_header(header, 24156))
nonce = uint256_from_bytes(bfh(header.get('nonce'))[::-1])
solution = bfh(header.get('solution'))[::-1]
offset, length = var_int_read(solution, 0)
solution = solution[offset:]
self.assertTrue(is_gbp_valid(header_bytes, nonce, solution, n, k))
def test_scrypt(self):
#0200000011f1fe21e0b66dc214be46366465cb95d29830e31ddd225a11349a836a993bf7b5db36b3e5593d039779bff204d132b65ee029a2e499ebeb5a4b19cbe862eee2b623cc5276676c1c000e1c60
header = {
'block_height': 12095,
'nonce': 1612451328,
'timestamp': 1389110198,
'version': 2,
'prev_block_hash':
'f73b996a839a34115a22dd1de33098d295cb65643646be14c26db6e021fef111',
'merkle_root':
'e2ee62e8cb194b5aebeb99e4a229e05eb632d104f2bf7997033d59e5b336dbb5',
'bits': 476866422
}
powhash = rev_hex(bh2u(scryptGetHash(bfh(serialize_header(header)))))
self.assertEqual(
powhash,
'00000000335c88172421df73a1c1f22f4d7c23d8ef34c78d728c4eff3ba24a34')