…endencies)

- add `internalPubkey` and `redeems` fields
- add some temp comments

…pend

…wn and script path is not used

… hash from the taproot tree

…`leafHash()``

…t` to `rootHashFromTree`

…Hash()`

…`fromOutputScript`)

* test: add PSBT example for taproot

* refactor: variable renaming

* refactor: use constant for tapscript leaf version

* feat: reuse redeem field for taproot spend

* test: make sure it defaults to tapscript version 192

* chore: remove `scriptLeaf` logic

* feat: add tapscript sign() a finalize() logic

* test: spend taproot script-path

* test: add tapscript for OP_CHECKSEQUENCEVERIFY

* feat: add multisig integration test

* refactor: rename scriptsTree to scriptTree (as per BP341)

* feat: check that the scriptTree is a binary tree

* feat: compute the redeem from witness; add unit tests

* test: add test for invalid redeem script

* feat: check the redeemVersion on the input data first

* test: add tests for taproot script-path sign, and key-path finalize

…ipt` param to the end

…it tests)

* Move the (much simplified) type check function to types.ts
* Use `Tapleaf` type a bit more (this might be a bad idea)
* Be more consistent in the capitalization of `Taptree`

Because the taggedHash API is typed, these are compile-time checked and
it's more clear w/o the constants.

* More clearly show the continuation and base cases in findScriptPath
* Return undefined not empty path when no path is found
  * This would lead to generating an invalid witness
* Tighten the type for HashTree to not allow 1-sided branch nodes

* Also added caching of `hashTree`, per todo.
* Added a test for this functionality

The spec uses this notation because in a spec there's no such thing as
reassigning a value. In real code it is appropriate to us accumulators
or such.

* refactor: explicit initialization on the ecc library

- remove optional `eccLib` parameter for `p2tr` and `psbt`