<ul><li>The user is trying to send a raw transaction in the regtest (regression test) mode using a p2pkh address generated with a seed phrase.</li><li>The user has already generated 101 blocks and has an unspent transaction output (UTXO) available in the address.</li><li>The user's problem is related to the signature in the transaction, specifically the 'mandatory-script-verify-flag-failed' error.</li><li>The user is seeking assistance in identifying the issue and finding a solution.</li></ul>

mandatory-script-verify-flag-failed (Signature must be zero for failed CHECK(MULTI)SIG operation)

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