i generate the unix time, nonce from scratch, for regtest , now mining is working.
previously, i re-use the unix time, nonce that are generated for mainnet , in regtest. For that, mining wasn't working
Topic: Change genesis block, regtest mining fail (Read 253 times)
You could always compare your generated block with the actual genesis block:
May i know how to compare the generated block to actual genesis block? Comparing the hash of the block?Code:
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
Quote
Or when looking for specific values in a human readable fornat:
what is the command to generate the info above? Code:
{
"hash": "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
"ver": 1,
"prev_block": "0000000000000000000000000000000000000000000000000000000000000000",
"mrkl_root": "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
"time": 1231006505,
"bits": 486604799,
"nonce": 2083236893,
"n_tx": 1,
"size": 285,
"tx": [
{
"hash": "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
"ver": 1,
"vin_sz": 1,
"vout_sz": 1,
"lock_time": 0,
"size": 204,
"in": [
{
"prev_out": {
"hash": "0000000000000000000000000000000000000000000000000000000000000000",
"n": 4294967295
},
"coinbase": "04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73"
}
],
"out": [
{
"value": "50.00000000",
"scriptPubKey": "04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f OP_CHECKSIG"
}
],
"nid": "c2151f94f6ca6cecbe5d17cd12aaa40e5b1571ca10da82f2f5bcdb6205dcad6a"
}
],
"mrkl_tree": [
"4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"
],
"next_block": "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048"
}
You could always compare your generated block with the actual genesis block:
Or when looking for specific values in a human readable fornat:
Code:
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
Or when looking for specific values in a human readable fornat:
Code:
{
"hash": "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
"ver": 1,
"prev_block": "0000000000000000000000000000000000000000000000000000000000000000",
"mrkl_root": "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
"time": 1231006505,
"bits": 486604799,
"nonce": 2083236893,
"n_tx": 1,
"size": 285,
"tx": [
{
"hash": "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",
"ver": 1,
"vin_sz": 1,
"vout_sz": 1,
"lock_time": 0,
"size": 204,
"in": [
{
"prev_out": {
"hash": "0000000000000000000000000000000000000000000000000000000000000000",
"n": 4294967295
},
"coinbase": "04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73"
}
],
"out": [
{
"value": "50.00000000",
"scriptPubKey": "04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f OP_CHECKSIG"
}
],
"nid": "c2151f94f6ca6cecbe5d17cd12aaa40e5b1571ca10da82f2f5bcdb6205dcad6a"
}
],
"mrkl_tree": [
"4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"
],
"next_block": "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048"
}
Because the genesis block actually has to be mined. It must have a valid proof of work, you cannot just make a genesis block that fails the consensus rules (except for the prevblock rule).
I used the program genesisgen to mine the genesis block , and put the information , such as, nBits, nonce , unix time , into CreateGenesisBlock() function.
May i know what is still missing ?
Because the genesis block actually has to be mined. It must have a valid proof of work, you cannot just make a genesis block that fails the consensus rules (except for the prevblock rule).
after i change genesis block in chainparams.cpp, i do mining in regtest mode.
i found out the reason , in regtest mode, after changing the genesis block, in bitcoin core mining.cpp, generateBlocks() call CheckProofOfWork(), the parameter passed to the function, includes hash value of block, so in CheckProofOfWork() , the line `if (UintToArith256(hash) > bnTarget)` is fulfilled and returns false, so mining fails.
Why changing of genesis block causing mining to fail in regtest ?
Quote
$ bitcoin-cli -datadir=../datadir2/ generate 101
[
]
the return result is empty. However, i can see new blocks created in debug.log[
]
Quote
CreateNewBlock(): block weight: 900 txs: 0 fees: 0 sigops 400
2018-08-02 08:15:24 nProofOfWorkLimit = 545259519 before bounds
2018-08-02 08:15:24 nProofOfWorkLimit = 545259519 before bounds
2018-08-02 08:15:24 nProofOfWorkLimit = 545259519 before bounds
2018-08-02 08:15:24 nProofOfWorkLimit = 545259519 before bounds
2018-08-02 08:15:24 nProofOfWorkLimit = 545259519 before bounds
2018-08-02 08:15:24 nProofOfWorkLimit = 545259519 before bounds
i found out the reason , in regtest mode, after changing the genesis block, in bitcoin core mining.cpp, generateBlocks() call CheckProofOfWork(), the parameter passed to the function, includes hash value of block, so in CheckProofOfWork() , the line `if (UintToArith256(hash) > bnTarget)` is fulfilled and returns false, so mining fails.
Why changing of genesis block causing mining to fail in regtest ?
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