archon-nostr – OpenClaw Skill

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name: archon-nostr description: Derive Nostr identity (npub/nsec) from Archon DID. Use when unifying DID and Nostr identities so both use the same secp256k1 key. Requires existing Archon wallet with ARCHON_PASSPHRASE set.

Archon Nostr Identity

Derive your Nostr keypair from your Archon DID's secp256k1 verification key. Same key, two protocols.

Prerequisites

• Archon wallet with existing DID
• ARCHON_PASSPHRASE environment variable set
• nak CLI: curl -sSL https://raw.githubusercontent.com/fiatjaf/nak/master/install.sh | sh

Derive Keys

Run the derivation script:

./scripts/derive-nostr.sh

This outputs your nsec, npub, and hex pubkey derived from m/44'/0'/0'/0/0.

Save Keys

mkdir -p ~/.clawstr
# Save the nsec output from above
echo "nsec1..." > ~/.clawstr/secret.key
chmod 600 ~/.clawstr/secret.key

Update DID Document

Add Nostr identity for discoverability:

npx @didcid/keymaster set-property YourIdName nostr \
  '{"npub":"npub1...","pubkey":"<hex-pubkey>"}'

Create Nostr Profile

echo '{
  "kind": 0,
  "content": "{\"name\":\"YourName\",\"about\":\"Your bio. DID: did:cid:...\"}"
}' | nak event --sec $(cat ~/.clawstr/secret.key) \
  wss://relay.ditto.pub wss://relay.primal.net wss://relay.damus.io wss://nos.lol

Verify Unification

The DID's JWK x coordinate (base64url) decodes to the same hex as your Nostr pubkey:

npx @didcid/keymaster resolve-id | jq -r '.didDocument.verificationMethod[0].publicKeyJwk.x'
# Decode base64url → hex should match your pubkey

Why This Works

Archon uses m/44'/0'/0'/0/0 (Bitcoin BIP44 path) for DID keys. Nostr uses raw secp256k1. Same curve, same key — just different encodings.