Server — HCS‑2 Client

TypeScript

import 'dotenv/config';
import { HCS2Client, HCS2RegistryType } from '@hashgraphonline/standards-sdk';

const client = new HCS2Client({
  network: 'testnet',
  operatorId: process.env.HEDERA_ACCOUNT_ID!,
  operatorKey: process.env.HEDERA_PRIVATE_KEY!,
});

const reg = await client.createRegistry({ registryType: HCS2RegistryType.INDEXED, ttl: 86400 });
await client.registerEntry(reg.topicId!, {
  targetTopicId: '0.0.700123',
  metadata: 'https://example.com/meta.json',
});

Go

import "github.com/hashgraph-online/standards-sdk-go/pkg/hcs2"

client, err := hcs2.NewClient(hcs2.ClientConfig{
	Network:            "testnet",
	OperatorAccountID:  os.Getenv("HEDERA_ACCOUNT_ID"),
	OperatorPrivateKey: os.Getenv("HEDERA_PRIVATE_KEY"),
})
if err != nil {
	log.Fatal(err)
}

reg, err := client.CreateRegistry(ctx, hcs2.CreateRegistryOptions{
	RegistryType: hcs2.RegistryTypeIndexed,
	TTL:          86400,
})
if err != nil {
	log.Fatal(err)
}

_, err = client.RegisterEntry(ctx, reg.TopicID, hcs2.RegisterEntryOptions{
	TargetTopicID: "0.0.700123",
	Metadata:      "https://example.com/meta.json",
}, "")