[ZIP 48] - Multi-Script Hierarchy for Multi-Sig Wallets for Zcash

[nuttycom]

Next steps in the ZIP process:

• Any necessary additional ZIP Editor review beyond what was done in [ZIP 48] P2SH multisig #1074.

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Zcash will adopt a modified form of BIP 48 for use within Zcash, defining a unique script_type value for Zcash P2SH use.