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).
2. Output: either 409 username_unavailable or 402 payment_required.
3. If 409, pick another username and repeat step 1.
4. Output: 402 payment_required response.
5. Read L402 challenge values from 402 response: macaroon, invoice, paymentHash, amountSats, expiresAt.
6. Output: invoice + macaroon.
7. Pay the Lightning invoice and obtain preimage.
8. Output: payment preimage.
9. Retry the exact same POST /api/v1/registrations with:
10. Authorization: L402 <macaroon>:<preimage>
11. Output: 201 or 202 with managementToken.
12. Save the management token immediately.
13. CRITICAL: If this token is lost, updates are impossible.
14. 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 '%sn' "$MGMT" > "$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:
3. Authorization: Bearer <managementToken>
4. 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"}"