What is the rationale for inclusion of previous amount in SegWit signing process?

by Coding Enthusiast   Last Updated May 31, 2019 05:27 AM

When spending a P2PKH output, the "data" we hash only includes the output script from previous transaction but when spending a P2WPKH (the new serialization) we also include the amount field from previous transaction (#6 in BIP-143 specification). Why?

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