A simple program to create test PSBT files, that are plausible and self-consistent so that PSBT-signing tools will actually sign them. Does not involve any blockchains... completely made up inputs and output addresses are chosen at random.
You should use the XPUB of the Coldcard you want experiment against.
This can be retrieved using ckcc xpub
with the ckcc-protocol
CLI tool, or by exporting the wallet (see Advanced > MicroSD > Export Wallet menu).
For the Coldcard Simulator, you could use tpubD6NzVbkrYhZ4XzL5Dhayo67Gorv1YMS7j8pRUvVMd5odC2LBPLAygka9p7748JtSq82FNGPppFEz5xxZUdasBRCqJqXvUHq6xpnsMcYJzeh
git clone https://github.com/Coldcard/psbt_faker.git
cd psbt_faker
python3 -m pip install -U pip setuptools
python3 -m pip install --editable .
rehash
$ psbt_faker --help
Usage: psbt_faker [OPTIONS] OUTPUT.PSBT [XPUB]
Construct a valid PSBT which spends non-existant BTC to random addresses!
Options:
-n, --num-outs INTEGER Number of outputs (default 1)
-c, --num-change INTEGER Number of change outputs (default 1)
-v, --value INTEGER Total BTC value of inputs (integer, default
3)
-f, --fee INTEGER Miner's fee in Satoshis
-s, --segwit Make ins/outs be segwit style
-a, --styles [p2wpkh|p2wsh|p2sh|p2pkh|p2wsh-p2sh|p2wpkh-p2sh|p2tr]
Output address style (multiple ok)
-6, --base64 Output base64 (default binary)
-t, --testnet Assume testnet3 addresses (default mainnet)
-p, --partial Change first input so its different XPUB and
result cannot be finalized
-z, --zero-xfp Provide zero XFP and junk XPUB (cannot be
signed, but should be decodable)
--help Show this message and exit.
$ export XPUB=tpubD6NzVbkrYhZ4Xp6tGusznF6KMdYHy1JSCdDk3XVLDuAA7EgJKghA5J1FP4pDXb4sCypJjAYPB4uTTXkVo2iWzK8BsMaccXTNyShDx3gxagi
$ psbt_faker foo.psbt $XPUB -s -a p2wsh --fee 15000000 -c 0
Fake PSBT would send 3 BTC to:
2.85000000 => bc1qqalzjffzy9nwcd35t0phdyugdmmqpskldgcw3xd40qxh32z908msf5alem
0.15000000 => miners fee
$ psbt_faker foo.psbt $XPUB -n 10
Fake PSBT would send 3 BTC to:
0.27272636 => 17VardgvHiYjDEtpBRWpqQLgrvKDUiGGaW
0.27272636 => 1A1FDLRD1caNjbwpr4odqpcB2sGgZSgGqZ
0.27272636 => 1P3Zr4zQko2CDbDDiqrkMduSppNB3Pb1Aq
0.27272636 => 1LcDusCVB6KjjAcrk5NvscV4AQ3cRJTR8j
0.27272636 => 15oy1fAxnbYr6Vgz7eNwjBQfujdvssdRaG
0.27272636 => 1EkYuiLo9Tt3cYCJwMfDvX38MddTBMqPc1
0.27272636 => 185VxgHqCEYudH6XXwdDiQtqfEUXGMxSXJ
0.27272636 => 19dR12aRSj8nyUaJLM11ruExa7N6jdAmUJ
0.27272636 => 1Ppj73d7z6cQvKhzezmaBywbJRSUnrymPE
0.27272636 => 1CPCdAWTrVqgS8cHVTbDQwkCvASjTfcaTe
0.27272636 => 1F2WTuA3BRpYmM82gsLuAdyAiLPYoUYijP (change back)
0.00001000 => miners fee
$ psbt_faker foo.psbt $XPUB -n 3 -v 100 -c 10
Fake PSBT would send 100 BTC to:
7.69230692 => 13mRoGiQHzmPhaCgQZbjw42njWhV3ymqDw
7.69230692 => 1MMbuGuuaJ9GnRXh4ixa6xiKER3xzg52TJ
7.69230692 => 1NjnUBrWSSx8iK5TC3XJXqQ7grC23kpZX2
7.69230692 => 1Aq96VVsd2nocTqAYQ4PnD6XhotKqmrBNn (change back)
7.69230692 => 1Bj7KprFDJ1d1F1se3DKedASFYvjWNaZMT (change back)
7.69230692 => 1HVTgLgZF95tF4B1CJk4BEvkLmT3hYDrmA (change back)
7.69230692 => 17Uz3tHeG1Zf8W4hmst2kQtbH17tHe3UTN (change back)
7.69230692 => 1LyLjaPcXbo5TxJYMYyUT9HzCgkJnKef1j (change back)
7.69230692 => 19DasuH8grQGc4MrPPR5abYUZAKF9UbbwZ (change back)
7.69230692 => 1JpymwTGWfXpcurLnsFbLcPRnkkzvRiKsy (change back)
7.69230692 => 1PoFUSStjmogrv2eEtRjbpz8N5reETVVZn (change back)
7.69230692 => 1Q8yrQsHotMNkrsAyEynDAuqC8rDs7nG41 (change back)
7.69230692 => 1AbiaE64hjUygVoqkedaLvneHht8bbvPgo (change back)
0.00001000 => miners fee
psbt_faker foo.psbt $XPUB -n 10 -a p2wpkh -a p2wsh -a p2sh -a p2pkh -a p2wsh-p2sh -a p2wpkh-p2sh
Fake PSBT would send 3 BTC to:
0.27272636 => bc1q2l0zgfksxacs8hdxwmq56ftpzagcyvq8z237qf
0.27272636 => bc1q4ru6vpngexl348we0fkydheat3azcvr96uc975tmvcy0z8kjaz6qz30498
0.27272636 => 37Axq8rmQGjEHVoCb877RiNfWnnMtFCZ6H
0.27272636 => 16JDSqRVvYdWV4KntQ5wjUK5es6CaiTyBc
0.27272636 => 3HXq92K1xvx6QMNmQTHPWPLNiEReez595d
0.27272636 => 3LyBpZ2aaTs1Qj1NFmGGttL8PyhEzB9iDW
0.27272636 => bc1qsplnzq8n500q4zg6a8m2nj4c8ygvlp8p8zuppc
0.27272636 => bc1qw9hery5rjcujuf3f09djlxepepx6luen7jq9t0hfsu44dv3t6x3s4k4aw5
0.27272636 => 3Ld1TUaWQouRRGGAc8PSzvqtgjfyxdM3Vr
0.27272636 => 1ABmPHMdqK4MqF9BkACv8PHHYL7McmbYAq
0.27272636 => 15mkVohf2A1g9nVo9tn2KtN2f4eBHQCche (change back)
0.00001000 => miners fee