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One of the standardness rules (relay rules) in Bitcoin Core is that the scriptSig must contain only operations that push data to the stack. Since you have actual opcodes that do non-push things, this transaction is non-standard so your node is not accepting it. On regtest, you can disable standardness checks by adding -acceptnonstdtxn to your startup ...


I want to know why the two tools are giving different results Bitcoin Core uses hardened derivation to derive child private keys from the master private key. You can check the embedded link for more details, but in summary it means that the software uses parent private keys within the hash function to generate child private keys. This compares to non-...


You need to fill up the mempool of your regtest nodes and mine blocks. For reference here is how it's done to test estimatesmartfee.

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