(WIP) Namecoin / AuxPoW: Add prev_hash to checkpoint logic

TODO: Fill this in for Bitcoin; maybe submit upstream to Electrum.
JeremyRand · Mar 25, 2019 · 14ea0aa · 14ea0aa
1 parent 55b85d9
commit 14ea0aa
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diff --git a/electrum/blockchain.py b/electrum/blockchain.py
@@ -456,6 +456,8 @@ def get_hash(self, height: int) -> str:
             return '0000000000000000000000000000000000000000000000000000000000000000'
         elif height == 0:
             return constants.net.GENESIS
+        elif height == (constants.net.max_checkpoint() + 1) // 2016 * 2016 - 1:
+            return constants.net.VERIFICATION_BLOCK_LAST_HASH
         else:
             header = self.read_header(height)
             if header is None:

diff --git a/electrum/constants.py b/electrum/constants.py
@@ -67,6 +67,8 @@ class BitcoinMainnet(AbstractNet):
     VERIFICATION_BLOCK_LAST_CHAINWORK = 1458314160032177082968012064
     # Bits used in height + 1
     VERIFICATION_BLOCK_LAST_BITS = 389010995
+    # Hash of (height + 1) // 2016 * 2016 - 1
+    VERIFICATION_BLOCK_LAST_HASH = "TODO"
 
     XPRV_HEADERS = {
         'standard':    0x0488ade4,  # xprv