Add spending policy demo blog post

diff --git a/content/blog/2021/spending_policy_demo.md b/content/blog/2021/spending_policy_demo.md
new file mode 100644 (file)
index 0000000..19c197c
--- /dev/null
+++ b/content/blog/2021/spending_policy_demo.md
@@ -0,0 +1,435 @@
+---
+title: "Spending Policy Demo"
+description: "Demonstrate how to use a descriptor wallet with different spending policies"
+author: "Steve Myers and Thunderbiscuit"
+date: "2021-02-23"
+tags: ["guide", "descriptor"]
+hidden: true
+draft: false
+---
+
+In this post we will use the [bdk-cli](https://github.com/bitcoindevkit/bdk-cli) tool to demonstrate how to use the [bdk](https://github.com/bitcoindevkit/bdk) library to: 
+
+1. generate *testnet* public and private keys
+2. create [PSBT](https://bitcoinops.org/en/topics/psbt/)s that can be spent based on different [miniscript spending policies](http://bitcoin.sipa.be/miniscript/)
+3. cooperatively sign and finalize the resulting PSBTs
+4. broadcast and confirm spending transactions
+
+The scenario we will simulate is a wallet with two spending policies:
+
+A. **three** out of **three** signers must sign spending transaction input [UTXO](https://developer.bitcoin.org/glossary.html)s, **OR** 
+
+B. **two** out of **three** signers must sign **AND** the input UTXOs must be in a block mined a set relative time before the block of the spending transaction
+
+In a real-world wallet a longer relative time-lock would probably be used, but we chose a short time-lock to make testing easier.
+
+*Note: If you repeat these instructions on your own your extended keys, addresses, and other values will be different than shown in this post, but the end results should be the same.*
+
+# Initial Setup
+
+## Step 0: Install a recent version `bdk-cli`
+
+```bash
+cargo install --all-features --git https://github.com/bitcoindevkit/bdk-cli.git
+
+# confirm bdk-cli is installed
+bdk-cli --version
+BDK CLI 0.1.1-dev
+
+# bdk-cli usage can be explored with the `help` sub-command
+bdk-cli help
+```
+
+## Step 1: Generate private extended keys
+
+Generate new extended private keys for each of our wallet participants:
+
+```bash
+bdk-cli key generate | tee alice-key.json
+{
+  "fingerprint": "5adb4683",
+  "mnemonic": "witness poverty pulse crush era item game rose bargain quantum spawn sure way behave also basket journey worry stem entry toddler floor way bone",
+  "xprv": "tprv8ZgxMBicQKsPeAuGznXJZwfWHgWo86dFuufRBZN7ZT44UzoNG2cYmZLNLrnsm7eXhGSeccRU2nTtxunT11UkpqrRhJQefBnFJeHBddF68bg"
+}
+
+bdk-cli key generate | tee bob-key.json
+{
+  "fingerprint": "5fdec309",
+  "mnemonic": "shiver atom february jealous spy gallery upset height captain snake tooth master ugly orbit amazing nice parrot elevator own olympic great relief ozone violin",
+  "xprv": "tprv8ZgxMBicQKsPei56wJPNt9u2132Ynncp2qXdfSHszobnyjaGjQwxQBGASUidc1unmEmpyMQ9XzLgvbN36MDW7LNziVFdXVGMrx6ckMHuRmd"
+}
+
+bdk-cli key generate | tee carol-key.json
+{
+  "fingerprint": "de41e56d",
+  "mnemonic": "upon bridge side tool style lounge need faculty middle nation armed corn valve that undo ribbon rent digital adapt capable embody zero shiver carpet",
+  "xprv": "tprv8ZgxMBicQKsPf2edJLnXsF2AKwkCshCy2Z7fQD6FxiNVGsbkvpLRfxM8FSKrLqqpLFzLzVUBwgE9F5MQASrbedKCrGk1NG8oJgqYtmTLQEU"
+}
+```
+
+## Step 2: Extract private extended keys
+
+Here we use the `jq` Unix command to parse the json output of the `bdk-cli` commands.
+
+```bash
+export ALICE_XPRV=$(cat alice-key.json | jq -r '.xprv')
+
+export BOB_XPRV=$(cat bob-key.json | jq -r '.xprv')
+
+export CAROL_XPRV=$(cat carol-key.json | jq -r '.xprv')
+```
+
+## Step 3: Derive public extended keys
+
+For this example we are using the [BIP-84](https://github.com/bitcoin/bips/blob/master/bip-0084.mediawiki) key path: `m/84h/1h/0h/0/*` to derive extended public keys to share with other wallet participants. 
+
+We also use the `sed` Unix command to remove the origin master key fingerprint and path from our xpub keys since those parts do not need to be shared between wallet participants.
+
+```bash
+export ALICE_XPUB=$(bdk-cli key derive --xprv $ALICE_XPRV --path "m/84'/1'/0'/0" | jq -r ".xpub" | sed 's/^\[.*\]//g')
+echo \"$ALICE_XPUB\"
+"tpubDCyRBuncqwyAjSNiw1GWLmwQsWyhgPMEBpx3ZNpnCwZwf3HXerspTpaneN81KRxkwj8vjqH9pNWEPgNhen7dfE212SHfxBBbsCywxQGxvvu/0/*"
+
+export BOB_XPUB=$(bdk-cli key derive --xprv $BOB_XPRV --path "m/84'/1'/0'/0" | jq -r ".xpub" | sed 's/^\[.*\]//g')
+echo \"$BOB_XPUB\"
+"tpubDDQcUeBH9JFtgZEsHZBhmRu8AuZ8ceJY1umnipPVEg1had2coGMCWdFBXNnZWKoCPic3EMgDZTdmkAVNoakwNZu2ESSW36rQvts6VXGx4bU/0/*"
+
+export CAROL_XPUB=$(bdk-cli key derive --xprv $CAROL_XPRV --path "m/84'/1'/0'/0" | jq -r ".xpub" | sed 's/^\[.*\]//g')
+echo \"$CAROL_XPUB\"
+"tpubDCdxmvzJ5QBjTN8oCjjyT2V58AyZvA1fkmCeZRC75QMoaHcVP2m45Bv3hmnR7ttAwkb2UNYyoXdHVt4gwBqRrJqLUU2JrM43HippxiWpHra/0/*"
+```
+
+## Step 4: Create wallet descriptors for each participant
+
+We used the [BDK Playground Policy Compiler](https://bitcoindevkit.org/bdk-cli/playground/) to compile the [miniscript](http://bitcoin.sipa.be/miniscript/) policy:
+
+`thresh(3,pk(Alice),pk(Bob),pk(Carol),older(2))`
+
+To the [output descriptor](https://bitcoindevkit.org/descriptors/):
+
+`wsh(thresh(3,pk(Alice),s:pk(Bob),s:pk(Carol),sdv:older(2)))`
+
+This descriptor requires spending transaction inputs must be signed by all three signers, or by two signers ~17mins (512*2 seconds) after being included in a bitcoin block. 
+
+Each participant's descriptor only uses their own XPRV key plus the XPUB keys of the other participants.
+
+```bash
+export ALICE_DESCRIPTOR="wsh(thresh(3,pk($ALICE_XPRV/84'/1'/0'/0/*),s:pk($BOB_XPUB),s:pk($CAROL_XPUB),sdv:older(2)))"
+
+export BOB_DESCRIPTOR="wsh(thresh(3,pk($ALICE_XPUB),s:pk($BOB_XPRV/84'/1'/0'/0/*),s:pk($CAROL_XPUB),sdv:older(2)))" 
+
+export CAROL_DESCRIPTOR="wsh(thresh(3,pk($ALICE_XPUB),s:pk($BOB_XPUB),s:pk($CAROL_XPRV/84'/1'/0'/0/*),sdv:older(2)))"
+```
+
+# Policy A. Three signatures
+
+## Step 1a: Create a testnet [segwit0](https://en.bitcoin.it/wiki/Segregated_Witness) receive address
+
+This step can be done independently by Alice, Bob, or Carol.
+
+```bash
+bdk-cli wallet -w carol -d $CAROL_DESCRIPTOR get_new_address
+{
+  "address": "tb1qpqglt6yntay0se5vj3a7g36rql5pyzzp0w6jknfch2c0unwphsxs22g96e"
+}
+```
+
+## Step 2a: Send testnet bitcoin from a faucet to receive address
+
+After a faucet payment is sent, use a testnet block explorer to confirm the transaction was included in a block. 
+
+[https://mempool.space/testnet/address/tb1qpqglt6yntay0se5vj3a7g36rql5pyzzp0w6jknfch2c0unwphsxs22g96e](https://mempool.space/testnet/address/tb1qpqglt6yntay0se5vj3a7g36rql5pyzzp0w6jknfch2c0unwphsxs22g96e)
+
+## Step 3a: Sync participant wallets and confirm balance
+
+This step must be done by Alice, Bob, and Carol so their individual descriptor wallets know about the faucet transaction they will later be spending the output of.
+
+```bash
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR sync       
+{}
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR get_balance
+{
+  "satoshi": 10000
+}
+
+bdk-cli wallet -w bob -d $BOB_DESCRIPTOR sync       
+{}
+bdk-cli wallet -w bob -d $BOB_DESCRIPTOR get_balance
+{
+  "satoshi": 10000
+}
+
+bdk-cli wallet -w carol -d $CAROL_DESCRIPTOR sync       
+{}
+bdk-cli wallet -w carol -d $CAROL_DESCRIPTOR get_balance
+{
+  "satoshi": 10000
+}
+```
+
+## Step 4a: View wallet spending policies
+
+This can also be done by any wallet participant, as long as they have the same descriptor and extended public keys from the other particpants..
+
+```bash
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR policies
+{
+  "external": {
+    "contribution": {
+      "conditions": {
+        "0": [
+          {}
+        ],
+        "3": [
+          {
+            "csv": 2
+          }
+        ]
+      },
+      "items": [
+        0,
+        3
+      ],
+      "m": 3,
+      "n": 4,
+      "type": "PARTIAL"
+    },
+    "id": "tjdhrksc",
+    "items": [
+      {
+        "contribution": {
+          "condition": {},
+          "type": "COMPLETE"
+        },
+        "fingerprint": "5adb4683",
+        "id": "uyxvyzqt",
+        "satisfaction": {
+          "type": "NONE"
+        },
+        "type": "SIGNATURE"
+      },
+      {
+        "contribution": {
+          "type": "NONE"
+        },
+        "fingerprint": "4331a5e6",
+        "id": "w0xldflx",
+        "satisfaction": {
+          "type": "NONE"
+        },
+        "type": "SIGNATURE"
+      },
+      {
+        "contribution": {
+          "type": "NONE"
+        },
+        "fingerprint": "eebab672",
+        "id": "ghlsq5yk",
+        "satisfaction": {
+          "type": "NONE"
+        },
+        "type": "SIGNATURE"
+      },
+      {
+        "contribution": {
+          "condition": {
+            "csv": 2
+          },
+          "type": "COMPLETE"
+        },
+        "id": "8kel7sdw",
+        "satisfaction": {
+          "type": "NONE"
+        },
+        "type": "RELATIVETIMELOCK",
+        "value": 2
+      }
+    ],
+    "satisfaction": {
+      "type": "NONE"
+    },
+    "threshold": 3,
+    "type": "THRESH"
+  },
+  "internal": null
+}
+```
+
+## Step 5a: Create spending transaction
+
+The transaction can also be created by Alice, Bob, or Carol.
+
+```bash
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR create_tx -a --to tb1qm5tfegjevj27yvvna9elym9lnzcf0zraxgl8z2:0 --external_policy "{\"tjdhrksc\": [0,1,2]}"
+{
+  "details": {
+    "fees": 169,
+    "height": null,
+    "received": 0,
+    "sent": 10000,
+    "timestamp": 1614058791,
+    "transaction": null,
+    "txid": "3b9a7ac610afc91f1d1a0dd844e609376278fe7210c69b7ef663c5a8e8308f3e"
+  },
+  "psbt": "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"
+}
+
+export ALICE_PSBT=$(bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR create_tx -a --to tb1qm5tfegjevj27yvvna9elym9lnzcf0zraxgl8z2:0 --external_policy "{\"tjdhrksc\": [0,1,2]}" | jq -r ".psbt")
+```
+
+## Step 6a: Sign and finalize PSBTs
+
+```bash
+# ALICE SIGNS
+export BOB_PSBT=$(bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR sign --psbt $ALICE_PSBT | jq -r ".psbt")
+
+# BOB SIGNS
+export CAROL_PSBT=$(bdk-cli wallet -w bob -d $BOB_DESCRIPTOR sign --psbt $BOB_PSBT | jq -r ".psbt")
+
+# CAROL SIGNS
+export FINAL_PSBT=$(bdk-cli wallet -w carol -d $CAROL_DESCRIPTOR sign --psbt $CAROL_PSBT | jq -r ".psbt")
+
+## PSBT is finalized
+bdk-cli wallet -w carol -d $CAROL_DESCRIPTOR sign --psbt $CAROL_PSBT
+{
+  "is_finalized": true,
+  "psbt": "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"
+```
+
+## Step 7a: Broadcast finalized PSBT
+
+```bash
+bdk-cli wallet -w carol -d $CAROL_DESCRIPTOR broadcast --psbt $FINAL_PSBT
+{
+  "txid": "3b9a7ac610afc91f1d1a0dd844e609376278fe7210c69b7ef663c5a8e8308f3e"
+}
+```
+
+## Step 8a: Confirm transaction included in a testnet block
+
+[https://mempool.space/testnet/tx/3b9a7ac610afc91f1d1a0dd844e609376278fe7210c69b7ef663c5a8e8308f3e](https://mempool.space/testnet/tx/3b9a7ac610afc91f1d1a0dd844e609376278fe7210c69b7ef663c5a8e8308f3e)
+
+And new wallet balance is now zero.
+
+```bash
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR sync
+{}
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR get_balance
+{
+  "satoshi": 0
+}
+```
+
+## DONE!
+
+# Policy B. Two signatures after a relative time lock
+
+Now we will use the same extended private and public keys, and the same descriptors to receive and spend testnet bitcoin using only two of our participants signatures after the transaction input's relative time-lock has expired. 
+
+## Step 1b: Create a new testnet receive address
+
+The receive address can still be generated by Alice, Bob, or Carol.
+
+```bash
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR get_new_address
+{
+  "address": "tb1q886w2zmtakwxpngs9kn7y0a7tvd6e24u58sse2sv92zrjpnenfhqtfnmw9"
+}
+```
+
+## Step 2b: Fund new address from testnet faucet
+
+After the faucet payment is sent, confirm using a testnet block explorer to verify the transaction was included in a block. 
+
+[https://mempool.space/testnet/address/tb1q886w2zmtakwxpngs9kn7y0a7tvd6e24u58sse2sv92zrjpnenfhqtfnmw9](https://mempool.space/testnet/address/tb1q886w2zmtakwxpngs9kn7y0a7tvd6e24u58sse2sv92zrjpnenfhqtfnmw9)
+
+## Step 3b: Sync wallet and confirm wallet balance
+
+This step must be done by Alice and Bob so their individual descriptor wallets know about the faucet transaction they will later be spending the output of.
+
+```bash
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR sync       
+{}
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR get_balance
+{
+  "satoshi": 10000
+}
+
+bdk-cli wallet -w bob -d $BOB_DESCRIPTOR sync       
+{}
+bdk-cli wallet -w bob -d $BOB_DESCRIPTOR get_balance
+{
+  "satoshi": 10000
+}
+
+# NO CAROL SHE LOST HER KEY!
+```
+
+## Step 4b: Create spending transaction
+
+This spending transaction uses Alice and Bob's keys plus the ~17 minute (512x2 second) relative time-lock, see above [Step 4a](#step-4a-view-wallet-spending-policies) for the policy id. The transaction can be created by Alice or Bob.
+
+```bash
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR create_tx -a --to tb1qm5tfegjevj27yvvna9elym9lnzcf0zraxgl8z2:0 --external_policy "{\"tjdhrksc\": [0,1,3]}"
+{
+  "details": {
+    "fees": 169,
+    "height": null,
+    "received": 0,
+    "sent": 10000,
+    "timestamp": 1614059434,
+    "transaction": null,
+    "txid": "6a04c60dff8eeb14dc0848c663d669c34ddc30125d9564364c9414e3ff4a7d28"
+  },
+  "psbt": "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"
+}
+
+export ALICE_PSBT2=$(bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR create_tx -a --to tb1qm5tfegjevj27yvvna9elym9lnzcf0zraxgl8z2:0 --external_policy "{\"tjdhrksc\": [0,1,3]}" | jq -r ".psbt")
+```
+
+## Step 5b: Sign and finalize PSBTs
+
+```bash
+# ALICE SIGNS
+export BOB_PSBT2=$(bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR sign --psbt $ALICE_PSBT2 | jq -r ".psbt")
+
+# BOB SIGNS
+export FINAL_PSBT2=$(bdk-cli wallet -w bob -d $BOB_DESCRIPTOR sign --psbt $BOB_PSBT2 | jq -r ".psbt")
+
+# CAROL DOES *NOT* SIGN
+```
+
+## Step 6b: Broadcast finalized PSBT
+
+```bash
+bdk-cli wallet -w bob -d $BOB_DESCRIPTOR broadcast --psbt $FINAL_PSBT2
+thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Electrum(Protocol(String("sendrawtransaction RPC error: {\"code\":-26,\"message\":\"non-BIP68-final\"}")))', src/bdk_cli.rs:168:50
+
+# Oops we didn't wait long enough for the relative time lock to expire
+
+# Try again in ~20 mins and it is successfully broadcast
+
+bdk-cli wallet -w bob -d $BOB_DESCRIPTOR broadcast --psbt $FINAL_PSBT2          
+{
+  "txid": "6a04c60dff8eeb14dc0848c663d669c34ddc30125d9564364c9414e3ff4a7d28"
+}
+```
+
+## Step 7b: View confirmed transaction
+
+[https://mempool.space/testnet/tx/6a04c60dff8eeb14dc0848c663d669c34ddc30125d9564364c9414e3ff4a7d28](https://mempool.space/testnet/tx/6a04c60dff8eeb14dc0848c663d669c34ddc30125d9564364c9414e3ff4a7d28)
+
+And wallet balance is again zero
+
+```bash
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR sync
+{}
+bdk-cli wallet -w alice -d $ALICE_DESCRIPTOR get_balance
+{
+  "satoshi": 0
+}
+```
+
+## Done again!
+
+In this demo we showed how to receive and spend bitcoin using two different descriptor wallet policies using the `bdk` library and `bdk-cli` wallet tool.