Disable retargeting for regtest - option 1 #1273
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Retargeting is disabled on bitcoin core for regtest, but enabled on bitcoinj for regtest.
See https://github.com/bitcoin/bitcoin/blob/master/src/chainparams.cpp#L257
See https://github.com/bitcoin/bitcoin/blob/master/src/pow.cpp#L54
If you have a bitcoind running on regtest with more than 10k blocks, and use bitcoinj to sync with it, it will reject blocks starting on block 10,000.
I wrote 2 different solutions:
Solution 1: The way it is implemented on bitcoin core (this PR)
Solution 2: Simple solution (The other PR I created: #1274)