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How to compute double sha256
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dsha256.md

How compute double sha256

This example is from BIP 143 - Native P2WPKH

Compute double sha256

> export PREV_OUTS=fff7f7881a8099afa6940d42d1e7f6362bec38171ea3edf433541db4e4ad969f00000000ef51e1b804cc89d182d279655c3aa89e815b1b309fe287d9b2b55d57b90ec68a01000000
> echo -n $PREV_OUTS | xxd -r -p | openssl dgst -sha256 -binary | openssl dgst -sha256
96b827c8483d4e9b96712b6713a7b68d6e8003a781feba36c31143470b4efd37

References

BIP 143

How to compute double sha256 shown in examples of bip 143?

How do you perform double-SHA-256 encoding?

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