Does bitcoin still concatenate the locking and unlocking scripts and execute in order to validate transaction or is validation done another way?
Does bitcoin still concatenate the locking and unlocking scripts
No. This bug was fixed many years ago. ScriptSig and ScriptPubkey executed separately, not concatenated to each other
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No, but you are welcome to create such bogus coin :) There are millions of bugs you can do yourself and/or find on github – amaclin Apr 1 '18 at 20:12