plc を追加

plc.md

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+## handle change
+
+pdsの`PDS_PLC_ROTATION_KEY_K256_PRIVATE_KEY_HEX`を使用し、rotation-keyを作成後に、indigoにある`goat plc`を使用します。
+
+1. `goat key generate --type secp256k1`で生成されたキーを分析
+2. そのキーから正しいmulticodecプレフィックスを抽出
+3. PDSのhex keyに同じプレフィックスを適用
+
+```sh
+$ go install github.com/bluesky-social/indigo/cmd/goat@latest
+```
+
+```sh
+$ goat account login -u syui.syui.ai -p $PASS --pds-host https://syu.is
+
+$ goat plc history did:plc:vzsvtbtbnwn22xjqhcu3vd6y
+did:key:zQ3shZj81oA4A9CmUQgYUv97nFdd7m5qNaRMyG16XZixytTmQ
+
+$ goat plc update did:plc:vzsvtbtbnwn22xjqhcu3vd6y \
+  --handle syui.syui.ai \
+  --pds https://syu.is \
+  --atproto-key did:key:zQ3shZj81oA4A9CmUQgYUv97nFdd7m5qNaRMyG16XZixytTmQ > plc_operation_syui.json
+```
+
+```sh
+source base58_env/bin/activate
+
+python3 -c "
+import base58
+
+# 生成されたsecp256k1キーを分析
+generated_secp256k1 = '${zXXX...}'
+decoded = base58.b58decode(generated_secp256k1[1:])  # 'z'を除く
+
+print('Generated secp256k1 key analysis:')
+print('  Total length:', len(decoded))
+print('  Full hex:', decoded.hex())
+
+# 32バイトの鍵データを除いたプレフィックスを抽出
+if len(decoded) > 32:
+    prefix = decoded[:-32]
+    key_data = decoded[-32:]
+    print('  Prefix hex:', prefix.hex())
+    print('  Prefix length:', len(prefix))
+    print('  Key data length:', len(key_data))
+    
+    pds_rotation_hex = '${PDS_PLC_ROTATION_KEY_K256_PRIVATE_KEY_HEX}'
+    pds_rotation_bytes = bytes.fromhex(pds_rotation_hex)
+    
+    prefixed_rotation_key = prefix + pds_rotation_bytes
+    multibase_rotation_key = 'z' + base58.b58encode(prefixed_rotation_key).decode()
+    
+    print('\\nConverted PDS rotation key:')
+    print('  Multibase:', multibase_rotation_key)
+
+else:
+    print('  No prefix found, key is raw')
+"
+
+deactivate
+```
+
+```sh
+$ PDS_ROTATION_KEY=zXXX...
+
+$ goat plc sign --plc-signing-key "$PDS_ROTATION_KEY" plc_operation_syui.json > plc_signed_syui.json
+$ goat plc submit --did did:plc:vzsvtbtbnwn22xjqhcu3vd6y  plc_signed_syui.json
+success
+
+$ goat plc history did:plc:vzsvtbtbnwn22xjqhcu3vd6y
+```