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54e2bd6702
faff9e4bb431919a4bc7e4dc4a9ca188e2d18113 test: Remove unused, undocumented and misleading CScript.__add__ (MarcoFalke) Pull request description: See the corresponding pull #18612 ACKs for top commit: laanwj: ACK faff9e4bb431919a4bc7e4dc4a9ca188e2d18113 provided it passes Travis Tree-SHA512: 5d9c4d5b6453c70b24a6960d3b42834e9b31f6dbb99ac47a6abfd85f2739d5372563e7188c22aceabeee1c37eb218bf580848356f4a77268d65f178a9419b269
27 lines
1.3 KiB
Python
Executable File
27 lines
1.3 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2019 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Useful Script constants and utils."""
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from test_framework.script import CScript
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# To prevent a "tx-size-small" policy rule error, a transaction has to have a
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# size of at least 83 bytes (MIN_STANDARD_TX_SIZE in
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# src/policy/policy.h). Considering a Tx with the smallest possible single
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# input (blank, empty scriptSig), and with an output omitting the scriptPubKey,
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# we get to a minimum size of 60 bytes:
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#
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# Tx Skeleton: 4 [Version] + 1 [InCount] + 1 [OutCount] + 4 [LockTime] = 10 bytes
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# Blank Input: 32 [PrevTxHash] + 4 [Index] + 1 [scriptSigLen] + 4 [SeqNo] = 41 bytes
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# Output: 8 [Amount] + 1 [scriptPubKeyLen] = 9 bytes
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#
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# Hence, the scriptPubKey of the single output has to have a size of at
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# least 23 bytes, which corresponds to the size of a P2SH scriptPubKey.
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# The following script constant consists of a single push of 22 bytes of 'a':
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# <PUSH_22> <22-bytes of 'a'>
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# resulting in a 23-byte size. It should be used whenever (small) fake
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# scriptPubKeys are needed, to guarantee that the minimum transaction size is
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# met.
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DUMMY_P2SH_SCRIPT = CScript([b'a' * 22])
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DUMMY_2_P2SH_SCRIPT = CScript([b'b' * 22])
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