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pset tutorial: expand a couple of comments, fix numbering

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Andrew Poelstra 2021-09-30 23:37:28 +00:00
parent 4c7dc0620a
commit 57ea7e8a59
1 changed files with 14 additions and 8 deletions
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22
contrib/assets_tutorial/pset_swap_tutorial.py
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@ -257,17 +257,23 @@ assert all([x["has_utxo"] for x in analysis["inputs"]])
assert not any([x["is_final"] for x in analysis["inputs"]])
assert all([x["next"] == "signer" for x in analysis["inputs"]])
## 3. Blind the PSET
## 4. Blind the PSET
#
# Both parties now blind the PSET. Importantly, the final person to blind must
# have a combined PSET that has everyone else's blinding data included, so that
# they can make the blinding factors add up.
#
# In the 2-party case this is particularly simple because there is no need to
# combine anything.
# The most straightforward way to implement this is to have each party blind
# the PSET, then pass to the next party, who blinds in-turn. If there are more
# than 2 parties, then you can have all parties but one blind independently,
# `combinepsbt` the results, and give this to the final party to blind.
#
# In the two-party case these are equivalent.
#
# Just for fun, try to have both parties blind independently and combine
# Just for fun, try to have both parties blind independently and combine. This
# will fail because `combinepsbt` needs there to be at least one remaining
# unblinded output.
alice_blinded = alice.walletprocesspsbt(filled_pset)
carol_blinded = carol.walletprocesspsbt(filled_pset)
try:
@ -278,7 +284,7 @@ else:
raise Exception("combinepsbt should return 'Cannot combine PSETs as the values and blinders would become imbalanced'")
# Ok, back to the tutorial
print ("3. One party blinds the PSET and passes to the other party, who also blinds")
print ("4. One party blinds the PSET and passes to the other party, who also blinds")
# We set sign=False here, because otherwise carol's `walletprocesspsbt`
# will sign the transaction (since after she does her blinding, the
# transaction will be completely blinded and therefore signable).
@ -300,7 +306,7 @@ assert all([x["has_utxo"] for x in analysis["inputs"]])
assert not any([x["is_final"] for x in analysis["inputs"]])
assert all([x["next"] == "signer" for x in analysis["inputs"]])
## 4. Sign the PSET
## 5. Sign the PSET
#
# When signing, there are a couple options for workflows. Each party can sign
# in turn, like we did when blinding, or they can each sign independently and
@ -308,7 +314,7 @@ assert all([x["next"] == "signer" for x in analysis["inputs"]])
# demonstration purposes.
#
print ("4. Both parties sign the PSET")
print ("5. Both parties sign the PSET")
alice_signed = alice.walletprocesspsbt(blinded["psbt"])
carol_signed = carol.walletprocesspsbt(blinded["psbt"])
@ -324,7 +330,7 @@ assert all([x["has_utxo"] for x in analysis["inputs"]])
assert all([x["is_final"] for x in analysis["inputs"]])
assert all([x["next"] == "extractor" for x in analysis["inputs"]])
print ("5. Finalize and Extract")
print ("6. Finalize and Extract")
x = alice.finalizepsbt(complete, True)
assert x["complete"]
# The complete transaction is in x["hex"] but again we won't print it because