[testnet] genesis block doesn't accept during reindex

[DeckerSU]

Steps to reproduce:

1. Compile komodod from latest dev branch, and launch it, for example, with the following params:

-ac_name=INDXFAIL --testnet

As you will see in debug.log, the genesis block will be accepted:

2023-03-01 17:25:14 Pre-allocating up to position 0x1000000 in blk00000.dat
2023-03-01 17:25:14 UpdateTip: new best=e46e999d6de5ef95427ea51b8242ef7949de22b340b6a484ff154b9991ec9452  height=0  log2_work=4.0874628  tx=1  date=2011-02-02 23:16:42 progress=1.000000  cache=0.0MiB(0tx)
2023-03-01 17:25:14 init message: Rewinding blocks if needed...
2023-03-01 17:25:14 init message: Verifying blocks...

2. Change indexes in the ~/.komodo/INDXFAIL/INDXFAIL.conf to force reindex, for example, add the following lines into config:

addressindex=1
timestampindex=1
spentindex=1

As the previous indexes was only with txindex=1 it will trigger reindex:

2023-03-01 17:26:55 Reindexing block file blk00000.dat...

3. And then you will see in debug.log:

2023-03-01 17:26:55 Waiting for genesis block to be imported...
2023-03-01 17:26:55 Reindexing block file blk00000.dat...
2023-03-01 17:26:55 ERROR: CheckBlock: proof of work failed
2023-03-01 17:26:55 InvalidChainFound: invalid block=e46e999d6de5ef95427ea51b8242ef7949de22b340b6a484ff154b9991ec9452  height=0  log2_work=4.0874628  date=2011-02-02 23:16:42

And in stdout:

set addressindex, will reindex. could take a while.
set spentindex, will reindex. could take a while.
finished loading blocks INDXFAIL
OS_loadfile null size.(/home/decker/.komodo/INDXFAIL/komodostate)
komodo_faststateinit retval.-1
fAddressIndex.1/0 fSpentIndex.1/0
nLocalServices 30000005 1, 1
e46e999d6de5ef95427ea51b8242ef7949de22b340b6a484ff154b9991ec9452 hash vs 0f0f0f0000000000000000000000000000000000000000000000000000000000 ht.1 special.0 special2.0 flag.0 notaryid.-1 mod.1 error
04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb6 <- pubkey
04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb6 <- origpubkey
e46e999d6de5ef95427ea51b8242ef7949de22b340b6a484ff154b9991ec9452 failed hash ht.0
komodod: main.cpp:2647: void InvalidChainFound(CBlockIndex*): Assertion `tip' failed.

[DeckerSU]

It seems this happened because testnet genesis block selected by @jmjatlanta doesn't meet consensus.powLimit requirements, like:
e46e999d6de5ef95427ea51b8242ef7949de22b340b6a484ff154b9991ec9452 is bigger than
0f0f0f000000000000000000000000000000000000000000000000000000000 and inside CheckProofOfWork condition

if ( UintToArith256(hash = blkHeader.GetHash()) > bnTarget )
{
...
}

leads to fail. The solution is to re-create the testnet with new, acceptable genesis block.

[dimxy]

yes I suggest we can use the mainnet genesis for testnet (like it was originally)