Basic Taproot derivation support for descriptors #22051

pull sipa wants to merge 9 commits into bitcoin:master from sipa:202105_taproot_derive changing 16 files +834 −55
  1. sipa commented at 9:52 pm on May 24, 2021: member

    This is a subset of #21365, to aide review.

    This adds support tr(KEY) or tr(KEY,SCRIPT) or tr(KEY,{{S1,{{S2,S3},...}},...}) descriptors, describing Taproot outputs with specified internal key, and optionally any number of scripts, in nested groups of 2 inside {/} if there are more than one. While it permits importing tr(KEY), anything beyond that is just laying foundations for more features later.

    Missing:

    • Signing support (see #21365)
    • Support for more interesting scripts inside the tree (only pk(KEY) is supported for now). In particular, a multisig policy based on the new OP_CHECKSIGADD opcode would be very useful.
    • Inferring tr() descriptors from outputs (given sufficient information).
    • getaddressinfo support.
    • MuSig support. Standardizing that is still an ongoing effort, and is generally kind of useless without corresponding PSBT support.
    • Convenient ways of constructing descriptors without spendable internal key (especially ones that arent’t trivially recognizable as such).
  2. Make XOnlyPubKey act like byte container 4b1cc08f9f
  3. Change Solver() output for WITNESS_V1_TAPROOT 
    This is just a small simplification to prepare for the follow-up instruction
of a CTxDestination variant for taproot outputs.

In the old code, WITNESS_V1_TAPROOT and WITNESS_UNKNOWN both produced
{version, program} as Solver() output. Change this so that WITNESS_V1_TAPROOT
produces just {program}, like WITNESS_V0_* do.
    31df02a070
  4. Avoid dependence on CTxDestination index order 41839bdb89
  5. Separate WitnessV1Taproot variant in CTxDestination a4bf84039c
  6. Make consensus checking of tweaks in pubkey.* Taproot-specific 
    That results in a much safer interface (making the tweak commit
to the key implicitly using a fixed tag means it can't be used for
unrelated tweaking).
    2fbfb1becb
  7. Add XOnlyPubKey::CreateTapTweak 5f6cc8daa8
  8. Add TaprootBuilder class 
    This class functions as a utility for building taproot outputs, from
internal key and script leaves.
    90fcac365e
  9. Add tr() descriptor (derivation only, no signing) 
    This adds a new descriptor with syntax e.g. tr(KEY,{S1,{{S2,S3},S4})
where KEY is a key expression for the internal key and S_i are
script expression for the leaves. They have to be organized in
nested {A,B} groups, with exactly two elements.

tr() only exists at the top level, and inside the script expressions
only pk() scripts are allowed for now.
    7cedafc541
  10. tests: check derivation of P2TR 2667366aaa
  11. sipa force-pushed on May 24, 2021
  12. DrahtBot added the label Consensus on May 24, 2021
  13. DrahtBot added the label Descriptors on May 24, 2021
  14. DrahtBot added the label RPC/REST/ZMQ on May 24, 2021
  15. DrahtBot added the label Utils/log/libs on May 24, 2021
  16. DrahtBot added the label Wallet on May 24, 2021
  17. Sjors commented at 9:10 am on May 25, 2021: member
    utACK 2667366 (based on #21365 (comment) review, plus the new functional test)
  18. laanwj added this to the "Blockers" column in a project
  20. meshcollider commented at 12:20 pm on May 30, 2021: contributor

    This is so exciting 🎉

    utACK 2667366aaa69447a9de4d819669d254a5ebd4d4b

    Will test

  21. in src/script/standard.cpp:377 in 90fcac365e outdated 
    372@@ -370,3 +373,99 @@ CScript GetScriptForMultisig(int nRequired, const std::vector<CPubKey>& keys)
373 bool IsValidDestination(const CTxDestination& dest) {
374     return dest.index() != 0;
375 }
376+
377+/*static*/ TaprootBuilder::NodeInfo TaprootBuilder::Combine(NodeInfo&& a, NodeInfo&& b)
    fjahr commented at 11:41 pm on May 31, 2021:
    Are these static keywords here and one more below intentionally commented out?
    sipa commented at 0:11 am on June 1, 2021:
    Yes, the static needs to be mentioned at declaration time (in the class in the .h) file, you can’t repeat it at definition time. But putting it here in comments reminds the reader that it’s actually a static member function.
    fjahr commented at 8:37 pm on June 1, 2021:
    I see, thanks! I had never seen this before.
    laanwj commented at 7:44 pm on June 3, 2021:
    C++’s dual use of the keyword static is kind of confusing, but not @sipa’s fault of course. I think documenting that it’s a static member function is useful here.
  22. achow101 commented at 9:01 pm on June 2, 2021: member
    Code Review ACK 2667366aaa69447a9de4d819669d254a5ebd4d4b
  23. laanwj merged this on Jun 3, 2021
  24. laanwj closed this on Jun 3, 2021
  25. sidhujag referenced this in commit 4de66cc6fe on Jun 3, 2021
  26. meshcollider removed this from the "Blockers" column in a project
  27. in src/script/descriptor.cpp:651 in 41839bdb89 outdated 
    646+    if (std::holds_alternative<WitnessV0KeyHash>(dest) ||
647+        std::holds_alternative<WitnessV0ScriptHash>(dest) ||
648+        std::holds_alternative<WitnessUnknown>(dest)) {
649+        return OutputType::BECH32;
650+    }
651+    return std::nullopt;
    fjahr commented at 9:55 am on June 6, 2021:
    nit: could add a comment that this is for CNoDestination.
  28. in src/wallet/rpcwallet.cpp:3740 in a4bf84039c outdated 
    3736@@ -3737,6 +3737,7 @@ class DescribeWalletAddressVisitor
3737         return obj;
3738     }
3739 
3740+    UniValue operator()(const WitnessV1Taproot& id) const { return UniValue(UniValue::VOBJ); }
    fjahr commented at 10:21 am on June 6, 2021:
    nit: param seems to be named tap everywhere else
  29. fjahr commented at 8:31 pm on June 6, 2021: member
    utACK 2667366aaa69447a9de4d819669d254a5ebd4d4b
  30. in test/functional/wallet_taproot.py:201 in 2667366aaa 
    196+                i = random.randrange(len(KEYS))
197+                if not i in idxes:
198+                    break
199+            idxes.add(i)
200+            ret.append(KEYS[i])
201+        return ret
    jnewbery commented at 12:21 pm on June 8, 2021:
    I think this can be replaced with set(random.sample(KEYS, k=n))
    sipa commented at 3:35 pm on June 8, 2021:
    I think you’re right.
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  120. DrahtBot locked this on Aug 18, 2022


sipa Sjors lsilva01 meshcollider fjahr laanwj achow101 jnewbery

Labels
Wallet RPC/REST/ZMQ Consensus Utils/log/libs Descriptors

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