# Dependencies between potential protocol changes

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flowchart RL
    classDef nu7 fill:#ffe8e8,stroke:#d08080,font-weight:600;
    classDef txfmt fill:#f0ffff,stroke:#80a0b0;
    classDef key fill:#f0f0f0,stroke:#c8c8c8,font-size:28px;

    dep([<div style="margin:0.2em">Dependency</div>]) ~~~ usecase{{<div style="margin:0.2em">Use case</div>}} ~~~ NU7[Proposed for NU7]:::nu7 ~~~ Feature ~~~ needtx[Transaction/block<br>format change]:::txfmt ~~~~ A -->|<div style="font-size:18px;background-color:#ffffff">&nbsp;depends on&nbsp;</div>| B ~~~~ Key:::key

Note: Don't read too much into headings. Their length is constrained by a rendering limitation so they are not as nuanced as they could be.

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flowchart RL
    classDef benefit fill:#e8fde8,stroke:#909090;
    classDef category fill:#ffffec,stroke:#a0a0a0;
    classDef importantcategory fill:#ffffd0,stroke:#909090;
    classDef nu7 fill:#ffe8e8,stroke:#d08080,font-weight:600;
    classDef txfmt fill:#f0ffff,stroke:#80a0b0;
    classDef key fill:#ffffff,font-size:22px,font-weight:600;
    classDef invisible opacity:0;

    %% graph layout hacks
    zcashd ~~~ bolt
    zcashd ~~~ csv
    zcashd ~~~ onchainvote

    %% Primary blockers
    primary:::importantcategory
    subgraph primary[<div style="margin:0.7ex;font-size:22px;font-weight:500">Primary blockers</div>]
        dummy:::invisible ~~~ zcashd([<div style="padding:0.5ex">zcashd<br>Deprecation</div>]) 
        zallet[Zallet 1.0]
        zaino([<div style="padding:0.5ex">Zaino<br>libraries</div>])
    end

    zallet --> zaino
    zcashd --> zallet

    %% Required in some NU for new features
    txv6["<div style="background-color:#f0ffff">&nbsp;&nbsp;[ZIP 230/246]&nbsp;&nbsp;<br><div style="font-size:20px">v6 tx</div></div>"]:::nu7

    txv6 --> zcashd
    ZSAs --> zcashd

    %% Proposed NU7 features
    fees["[ZIP 2002]<br>Explicit Fees"]:::nu7
    keyrot["[ZIP ]<br>Key Rotation"]:::nu7
    lockbox["[ZIP ] Ongoing<br>Lockbox<br>Disbursement"]:::nu7
    NSM["[ZIP 233]<br>NSM"]:::nu7
    NSMuse["[ZIP 234/235]<br>NSM usage"]:::nu7
    sprout["[ZIP 2003]<br>Disable Sprout"]:::nu7

    s1:::benefit
    subgraph s1[<div style="margin-top:0.9ex;font-size:21px">Benefit to combine</div>]
        memo["[ZIP 231]<br>Memo Bundles"]:::nu7
        ZSAs["[ZIP 226/227]<br><div style='font-size:20px'>ZSAs</div>"]:::nu7
        QRecoverability["<div style='padding-left:0.5em;padding-right:0.5em'>[ZIP ] Quantum<br>Recoverability</div>"]:::nu7
        frost["[ZIP 312]<br>FROST"]
    end

    sprout ~~~ fees --> txv6
    NSM --> txv6
    keyrot --> txv6
    lockbox ---> txv6
    memo --> txv6
    QRecoverability --> txv6
    ZSAs --> txv6

    NSMuse --> NSM
    lockbox --> keyrot
    lockbox --> frost

    %% Things enabled by proposed NU7 features
    authaddr[Authenticated<br>Reply<br>Addresses]
    pruning{{<div style="margin:0.2em">Memo pruning</div>}}

    authaddr --> memo
    pruning --> memo

    %% Ongoing R&D
    ongoingrnd:::importantcategory
    subgraph ongoingrnd[<div style="margin:0.7ex;font-size:22px;font-weight:500">Ongoing R&D</div>]
        txcontrol[Payment<br>Approval] --> txcontroltx[Payment<br>Approval tx<br>format change]:::txfmt
        Crosslink[<div style="font-size:21px;margin:0.1em">Crosslink</div>] --> crosslinkblk[Block header<br>change or<br>equivalent]:::txfmt
        Tachyon[<div style="font-size:21px;margin:0.1em">Tachyon</div>] --> tachyontx[Tachyon tx<br>format change]:::txfmt
        swaps[Atomic<br>Swaps]
        longterm[Long-term<br>storage] --> longtermtx[Long-term storage<br>tx format change]:::txfmt        
        QRecovery[Quantum<br>Recovery] --> QRecoverytx[Quantum Recovery<br>tx format change]:::txfmt --> QRecoverability
    end

    %% Fake edge to fix render; this dependency does not exist.
    crosslinkblk ~~~ zcashd

    swaps ---> ZSAs
    Crosslink --> zcashd
    Tachyon --> zcashd

    %% Speculative R&D
    speculativernd:::category
    subgraph speculativernd[<div style="margin:0.8ex;font-size:22px;font-weight:500">Speculative R&D</div>]
        tzetx[TZE tx<br>format change]:::txfmt
        TZEs["[ZIP 222]<br>TZEs"]
        bolt["[ZIP 309]<br>BOLT"]
        stark[Ztarknet]
        eip1559["Automatic fee<br>adjustment"]
        proofofbal["Proof-of-<br>Balance"]
        onchainvote["On-Chain Voting"]
    end

    bolt --> TZEs
    stark --> TZEs
    TZEs --> tzetx
    eip1559 --> zcashd
    
    onchainvote --> proofofbal

    %% Other things that have fallen by the wayside
    wayside:::category
    subgraph wayside[<div style="margin-top:0.9ex;font-size:22px;font-weight:500">By the wayside</div>]
        csv["[ZIP 68/112/113]<br>CSV"]
        poolret["[ZIP 319]<br>Pool Retirement"]
        limitsap["[ZIP 219] Disable<br>moving into Sapling"]
        limittra["Disable moving<br>into transparent"]
    end

    limitsap --> poolret
    limittra --> poolret
    poolret --->|<div style="font-size:20px;background-color:#ffffec">&nbsp;wallet&nbsp;</div>| zcashd