Clank Human Bitcoin Address Skill

Use this skill to register and update a Human Bitcoin Address under clank.money (BIP-353 DNS payment instructions pointing to a BIP-321 URI).

CRITICAL FIRST

• managementToken is returned after successful paid registration (201 or 202).
• You must save managementToken immediately and securely.
• CRITICAL: If the token is lost, future updates to that address cannot be authenticated.

API Endpoints

• POST https://clank.money/api/v1/registrations
• GET https://clank.money/api/v1/registrations/{username}
• PATCH https://clank.money/api/v1/registrations/{username}

Required Registration Input

• username
  • lowercase letters, digits, hyphens
  • 3 to 32 chars
  • cannot start/end with -
• bip321Uri
  • required
  • must start with bitcoin:
  • should be valid BIP-321
  • strongly suggested: include a BOLT12 offer (lno=...)

Strict Registration Checklist

Registration price is 999 sats.

1. Submit unauthenticated registration request (POST /api/v1/registrations).
   • Output: either 409 username_unavailable or 402 payment_required.
2. If 409, pick another username and repeat step 1.
   • Output: 402 payment_required response.
3. Read L402 challenge values from 402 response: macaroon, invoice, paymentHash, amountSats, expiresAt.
   • Output: invoice + macaroon.
4. Pay the Lightning invoice and obtain preimage.
   • Output: payment preimage.
5. Retry the exact same POST /api/v1/registrations with:
   • Authorization: L402 \x3Cmacaroon>:\x3Cpreimage>
   • Output: 201 or 202 with managementToken.
6. Save the management token immediately.
   • CRITICAL: If this token is lost, updates are impossible.
   • Output: secure local token file.

Copy-Paste Happy Path (Bash)

set -euo pipefail

BASE="https://clank.money"
USERNAME="satoshi"
BIP321_URI='bitcoin:?lno=lno1examplebolt12offer'
TOKEN_FILE="$HOME/.clank/${USERNAME}.management_token"

mkdir -p "$(dirname "$TOKEN_FILE")"

# 1) Create challenge (or fail fast if name taken)
curl -sS -X POST "$BASE/api/v1/registrations" \
  -H "content-type: application/json" \
  --data "{\"username\":\"$USERNAME\",\"bip321Uri\":\"$BIP321_URI\"}" \
  > /tmp/clank_register_challenge.json

ERROR_CODE="$(python3 -c 'import json; d=json.load(open("/tmp/clank_register_challenge.json")); e=d.get("error"); print((e.get("code") if isinstance(e,dict) else e) or "")')"
if [ "$ERROR_CODE" = "username_unavailable" ]; then
  echo "Username is taken. Pick another USERNAME and rerun."
  exit 1
fi
if [ "$ERROR_CODE" != "payment_required" ]; then
  echo "Unexpected challenge response:"
  cat /tmp/clank_register_challenge.json
  exit 1
fi

MACAROON="$(python3 -c 'import json; print(json.load(open("/tmp/clank_register_challenge.json"))["macaroon"])')"
INVOICE="$(python3 -c 'import json; print(json.load(open("/tmp/clank_register_challenge.json"))["invoice"])')"
echo "Pay this invoice now:"
echo "$INVOICE"

# 2) After payment, paste your preimage
read -r -p "PASTE_PREIMAGE=" PREIMAGE

# 3) Complete paid registration
curl -sS -X POST "$BASE/api/v1/registrations" \
  -H "content-type: application/json" \
  -H "Authorization: L402 $MACAROON:$PREIMAGE" \
  --data "{\"username\":\"$USERNAME\",\"bip321Uri\":\"$BIP321_URI\"}" \
  > /tmp/clank_register_result.json

MGMT="$(python3 -c 'import json; d=json.load(open("/tmp/clank_register_result.json")); print(d.get("managementToken",""))')"
if [ -z "$MGMT" ]; then
  echo "No managementToken in final response:"
  cat /tmp/clank_register_result.json
  exit 1
fi

# 4) CRITICAL: persist token securely for future updates
printf '%s\
' "$MGMT" > "$TOKEN_FILE"
chmod 600 "$TOKEN_FILE"
echo "Saved management token to $TOKEN_FILE"

Update Flow

1. Load stored token from your secure file.
2. Call PATCH /api/v1/registrations/{username} with:
   • Authorization: Bearer \x3CmanagementToken>
   • JSON body with new bip321Uri

Example:

USERNAME="satoshi"
TOKEN_FILE="$HOME/.clank/${USERNAME}.management_token"
NEW_BIP321='bitcoin:?lno=lno1newbolt12offer'
MGMT="$(cat "$TOKEN_FILE")"

curl -sS -X PATCH "https://clank.money/api/v1/registrations/$USERNAME" \
  -H "content-type: application/json" \
  -H "Authorization: Bearer $MGMT" \
  --data "{\"bip321Uri\":\"$NEW_BIP321\"}"