Broadcast Crypto Transactions from HD Wallets

💸 Sending Crypto Using a Shard (Broadcasting a Transaction)

Poof’s non-custodial infrastructure lets you send cryptocurrency directly from your self-custody wallet, powered by TSS-MPC. No raw private key ever exists — instead, you hold a cryptographic shard, which is used to authorize and broadcast transactions securely.

Here’s how the process works:

🪙 Step 1: Initiate a Send

In the “Send Cryptocurrency” modal (screenshot 2)

1. Select the Asset — Choose the crypto you want to send (e.g. BNB).
2. Enter the Amount — Either in USD or in the native token.
3. Input the Destination Address — Paste the recipient’s wallet address.
   1. Poof will automatically:
      1. Broadcast the Transaction using the equivalent equivalent token amount (e.g. 0.24 USD → 0.00043 BNB) to the address
      2. Check that it meets the minimum withdrawal dust threshold (e.g. $0.01) or network threshold (Different for each network, Solana rent, etc.)4

📤 Step 2: Preview & Sign the Transaction

In the “Withdrawal Preview” modal (screenshot 1):

You’ll see a full breakdown of the transaction:

1. Destination Address: Where the funds are going
2. Price: Current exchange rate for the asset (e.g. $558.34 per BNB)
3. Total Payout: The USD equivalent of the amount being sent
4. Minimum Withdrawal: Reminder of the system minimum
5. Minimum Withdrawal: Reminder of the system minimum

Click “Broadcast Transaction” to continue.

🔐 Step 3: Shard Signing & Broadcasting

Behind the scenes, Poof will:

1. Use your stored shard and pair it with Poof’s TSS co-signer
2. When available, generate a signed transaction using MPC (Multi-Party Computation)
3. Broadcast the transaction directly to the blockchain

✅ If successful, you’ll see a green confirmation: “Transaction broadcasted successfully”. The transaction and hex will appear under the wallet's Transaction Tab.

📡 All of This Is Available via API v3

Everything you just saw — from initiating a send to signing and broadcasting a transaction with your shard — is fully supported in Poof API v3.

You can:

1. 💰 Send crypto programmatically using POST /v3/transactions/send
2. 🔐 Sign transactions with your shard client-side or via SDK
3. 📤 Broadcast signed transactions with a single call
4. 🧾 Track transaction status and view history
5. 🧱 Automate multi-wallet operations at scale

Whether you're building a fully embedded crypto experience or automating payouts for thousands of users, API v3 gives you full control — with the same security and simplicity seen in the UI.