First stuck
Hello there!
Well, I just started and im stucked at this point of your tutorial;
Now we will choose a different signature message in pchMessageStart of chainparams.cpp. This is a very important step, if it is not changed and you connect to a bitcoin node it will consider the bitcoin blockchain as the correct one. Do it like this:
Code:
pchMessageStart[0] = 0xf0;
pchMessageStart[1] = 0xb0;
pchMessageStart[2] = 0xb0;
pchMessageStart[3] = 0xd0;
Optional, but you can change the address prefix too. (1, 3, bc1)
Link of all prefixes:
https://en.bitcoin.it/wiki/List_of_address_prefixesIn the base58Prefixes of chainparams.cpp I will show an example of the "X" prefix:
Code:
base58Prefixes[PUBKEY_ADDRESS] = std::vector
(1,75);First part, I have succesfully* done changing the 3 part where the pch message on the chainparams neded:
pchMessageStart[0] = 0xf0;
pchMessageStart[1] = 0xb0;
pchMessageStart[2] = 0xb0;
pchMessageStart[3] = 0xd0;
nDefaultPort = 17333;
nPruneAfterHeight = 1000;
m_assumed_blockchain_size = 40;
m_assumed_chain_state_size = 2;
pchMessageStart[0] = 0xf0;
pchMessageStart[1] = 0xb0;
pchMessageStart[2] = 0xb0;
pchMessageStart[3] = 0xd0;
nDefaultPort = 17444;
nPruneAfterHeight = args.GetBoolArg("-fastprune", false) ? 100 : 1000;
m_assumed_blockchain_size = 0;
m_assumed_chain_state_size = 0;
pchMessageStart[0] = 0xf0;
pchMessageStart[1] = 0xb0;
pchMessageStart[2] = 0xb0;
pchMessageStart[3] = 0xd0;
nDefaultPort = 17444;
nPruneAfterHeight = args.GetBoolArg("-fastprune", false) ? 100 : 1000;
m_assumed_blockchain_size = 0;
m_assumed_chain_state_size = 0;
*It is really fine? as my point of view those 3 parts should have diferent prefixes, or i am wrong?
But, when I want to go to the step: base58Prefixes
I stuck since I really don´t understand 100% this configuration and what should i do
(for me is important to know for what is this and how should I do fine)Las time ive done it i followed this from another source:
Change address prefixes
Finally, let’s dive into the source code. Currently there are 3 standard address types in Bitcoin:
Pay to Pubkey Hash
Mainnet prefix “1”
Testnet/Regtest prefix “m or n”
Pay to Script Hash
Mainnet prefix “3”
Testnet/Regtest prefix “2”
Bech32 (Segwit)
Mainnet prefix “bc1”
Testnet prefix “tb1”
Regtest prefix “bcrt1”
Since these addresses are base58check encoded (except for bech32 which is it’s own custom encoding), we can set any prefix we want by using this helpful table of values found at
https://en.bitcoin.it/wiki/List_of_address_prefixes. The source file containing these prefix settings is src/chainparams.cpp:
// Mainnet: Line 140
// ...
base58Prefixes[PUBKEY_ADDRESS] = std::vector(1,0);
base58Prefixes[SCRIPT_ADDRESS] = std::vector(1,5);
base58Prefixes[SECRET_KEY] = std::vector(1,128);
base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x88, 0xB2, 0x1E};
base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x88, 0xAD, 0xE4};
bech32_hrp = "bc";
// ...
// Testnet: Line 244
base58Prefixes[PUBKEY_ADDRESS] = std::vector(1,111);
base58Prefixes[SCRIPT_ADDRESS] = std::vector(1,196);
base58Prefixes[SECRET_KEY] = std::vector(1,239);
base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};
bech32_hrp = "tb";
// ...
// Regtest: Line 344
base58Prefixes[PUBKEY_ADDRESS] = std::vector(1,111);
base58Prefixes[SCRIPT_ADDRESS] = std::vector(1,196);
base58Prefixes[SECRET_KEY] = std::vector(1,239);
base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};
bech32_hrp = "bcrt";
...
We want our p2pkh addresses to start with the letter “K” on mainnet and “k” on testnet and regtest. Then we want p2psh addresses to start with “L” on mainnet and “t” on testnet and regtest. We’ll keep secret keys the same, but we’ll change the bech32 addresses to “lc”, “tl”, and “lcrt” for mainnet, testnet, and regtest respectively. Based on the values in the table linked above, our chainparams.cpp becomes:
// Mainnet: Line 140
// ...
base58Prefixes[PUBKEY_ADDRESS] = std::vector(1,45); // K
base58Prefixes[SCRIPT_ADDRESS] = std::vector(1,48); // L
// ...
bech32_hrp = "lc";
// ...
// Testnet: Line 244
base58Prefixes[PUBKEY_ADDRESS] = std::vector(1,107); // k
base58Prefixes[SCRIPT_ADDRESS] = std::vector(1,65); // t
// ...
bech32_hrp = "tl";
// ...
// Regtest: Line 344
base58Prefixes[PUBKEY_ADDRESS] = std::vector(1,107); // k
base58Prefixes[SCRIPT_ADDRESS] = std::vector(1,65); // t
// ...
bech32_hrp = "lcrt";
...
