Awesome puzzle! But it is not as simple as just find the recovery phrase or the private key.
The Public Address ( 3CcxyPhyvyc3S9UuPfu42GNZLvVVV11Uk8 ) starts with 3. That means this is a multi signature address.
That means you need at least 2 out of 3 private keys to sign the Transaction.
No it's a segwit address. BIP39 seed words -> BIP49 derivation.
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