The series of commands above first encodes Mohammed's multisig redeem script as a serialized hex-encoded bitcoin Script. The next +bx+ command calculates the SHA256 hash of that. The next +bx+ command hashes again with RIPEMD160, producing the final script-hash:
The 20-byte hash of Mohammed's redeem script is:
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54c557e07dde5bb6cb791c7a540e0a4796f5e97e
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A P2SH transaction locks the output to this hash instead of the longer script, using the locking script:
A P2SH transaction locks the output to this hash instead of the longer redeem script, using the locking script: