Skip to content

Instantly share code, notes, and snippets.

View Christewart's full-sized avatar

Chris Stewart Christewart

95 followers · 21 following
View GitHub Profile
@Christewart
Christewart / Parsing Bitcoin Script OP_IF OP_ELSE expressions
Last active February 2, 2016 22:11
//original script
//0 IF 1 IF RETURN ELSE RETURN ELSE RETURN ENDIF ELSE 1 IF 1 ELSE RETURN ELSE 1 ENDIF ELSE RETURN ENDIF ADD 2 EQUAL
//OP_IF RULE
//If the top stack value is not 0, the statements are executed. The top stack value is removed.
//OP_ELSE RULE
//If the preceding OP_IF or OP_NOTIF or OP_ELSE was not executed then these statements are and
//if the preceding OP_IF or OP_NOTIF or OP_ELSE was executed then these statements are not.
0
@Christewart
Christewart / Parsing OP_IF OP_ELSE Script expression 2
Last active January 27, 2016 20:40
//1 OP_IF, OP_IF, OP_1, OP_ELSE, OP_0, OP_ENDIF, OP_ELSE, OP_IF, OP_0, OP_ELSE, OP_1, OP_ENDIF, OP_ENDIF
1
OP_IF
OP_IF
OP_1
OP_ELSE
OP_0
OP_ENDIF
OP_ELSE
OP_IF
@Christewart
Christewart / Script 3
Created January 30, 2016 15:04
//"0", "IF 1 IF RETURN ELSE RETURN ELSE RETURN ENDIF ELSE 1 IF 1 ELSE RETURN ELSE 1 ENDIF ELSE RETURN ENDIF ADD 2 EQUAL
0
OP_IF
1
OP_IF
OP_RETURN
OP_ELSE
OP_RETURN
OP_ELSE
@Christewart
Christewart / Script 4
Last active February 1, 2016 15:29
//OP_0 OP_IF,OP_1, OP_IF,OP_RETURN, OP_ELSE, OP_RETURN, OP_ELSE, OP_RETURN,OP_ENDIF,
//OP_ELSE, OP_1,OP_IF,OP_1,OP_ELSE,
//OP_RETURN,OP_ELSE,OP_1,OP_ENDIF, OP_ELSE,OP_RETURN,OP_ENDIF,OP_ADD,OP_2,OP_EQUAL
OP_0
OP_IF
OP_1
OP_IF
OP_RETURN
OP_ELSE
OP_RETURN
@Christewart
Christewart / tx_to_stdout_hex.cpp
Created March 19, 2016 20:39
Bitcoin Core transaction to stdout in hex format
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
ss << tx;
printf("Transaction: %s\n", HexStr(ss).c_str());
@Christewart
Christewart / gist:dcd622b4ae8832a91c3d
Created March 19, 2016 20:50
Running bitcoin core test case and getting tx hex to stdout
chris@chris:~/.../src/test$ ./test_bitcoin -t script_tests/script_valid
Running 1 test case...
tests: [["Automatically generated test cases"],["0x47 0x304402200a5c6163f07b8d3b013c4d1d6dba25e780b39658d79ba37af7057a3b7f15ffa102201fd9b4eaa9943f734928b99a83592c2e7bf342ea2680f6a2bb705167966b742001","0x41 0x0479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8 CHECKSIG","","P2PK"]]
Transaction: 01000000019ce5586f04dd407719ab7e2ed3583583b9022f29652702cfac5ed082013461fe000000004847304402200a5c6163f07b8d3b013c4d1d6dba25e780b39658d79ba37af7057a3b7f15ffa102201fd9b4eaa9943f734928b99a83592c2e7bf342ea2680f6a2bb705167966b742001ffffffff0100000000000000000000000000
Done
*** No errors detected
@Christewart
Christewart / serialize_bitcoin_script
Created May 5, 2016 20:32
//Shows how to print a bitcoin script to stdout
#include <iostream>
#include "core_write.h"
cout << "Script being executed: " << ScriptToAsmStr(script) << std::endl;
@Christewart
Christewart / stack_state_to_hex
Last active May 5, 2016 20:48
//prints the op code being executed & the stack state BEFORE op code execution
#include "utilstrencodings.h"
#include "streams.h"
#include "script.h"
cout << "Op being executed: " << GetOpName(opcode) << "\n";
for (unsigned int i = 0; i < stack.size(); i++) {
for (unsigned int j = 0; j < stack[i].size(); j++) {
ss << stack[i][j];
}
@Christewart
Christewart / script_stack_state_print_msg
Created May 5, 2016 20:51
Script being executed: 3045022100c9cdd08798a28af9d1baf44a6c77bcc7e279f47dc487c8c899911bc48feaffcc0220503c5c50ae3998a733263c5c0f7061b483e2b56c4c41b456e7d2f5a78a74c07703 02d5c25adb51b61339d2b05315791e21bbe80ea470a49db0135720983c905aace0
Op being executed: OP_UNKNOWN
Stack:
Op being executed: OP_UNKNOWN
Stack: 3045022100c9cdd08798a28af9d1baf44a6c77bcc7e279f47dc487c8c899911bc48feaffcc0220503c5c50ae3998a733263c5c0f7061b483e2b56c4c41b456e7d2f5a78a74c0770320
Script being executed: OP_DUP OP_HASH160 e52b482f2faa8ecbf0db344f93c84ac908557f33 OP_EQUALVERIFY OP_CHECKSIG
Op being executed: OP_DUP
Stack: 3045022100c9cdd08798a28af9d1baf44a6c77bcc7e279f47dc487c8c899911bc48feaffcc0220503c5c50ae3998a733263c5c0f7061b483e2b56c4c41b456e7d2f5a78a74c077032002d5c25adb51b61339d2b05315791e21bbe80ea470a49db0135720983c905aace020
Op being executed: OP_HASH160
Stack: 3045022100c9cdd08798a28af9d1baf44a6c77bcc7e279f47dc487c8c899911bc48feaffcc0220503c5c50ae3998a733263c5c0f7061b483e2b56c4c41b456e7d2f5a78a74c077032002d5c25adb51b61339d2b053157
@Christewart
Christewart / blockchainGenerators.scala
Created July 18, 2016 01:20
trait BlockchainElementsGenerator {
def block : Gen[Block] = for {
header <- blockHeader
txs <- Gen.listOfN(randomNumber(10), TransactionGenerators.transactions)
} yield Block(header, txs)
def blockHeader : Gen[BlockHeader] = for {
version <- NumberGenerator.uInt32s
previousBlockHash <- CryptoGenerators.doubleSha256Digest