How to use SubWallet for Polkadot crowdloans? (Slot Auctions)

SubWallet Interface Navigation

1. Open the SubWallet browser extension or mobile application and ensure it is connected to either Polkadot or Kusama network depending on the target crowdloan.

2. Navigate to the Crowdloans tab located in the main menu—this section lists all active and upcoming parallel chain auctions.

3. Select a specific crowdloan campaign by tapping its name; SubWallet displays real-time contribution status, lease period, remaining time, and reward structure directly on the campaign card.

4. Verify the project’s official metadata—including on-chain deposit address, crowdloan pallet ID, and runtime version—to confirm authenticity before proceeding.

5. Tap “Contribute” to initiate the transaction; SubWallet automatically pre-fills the correct extrinsic call crowdloan.contribute with validated parameters.

Contribution Execution Steps

1. Enter the desired amount of DOT or KSM to contribute; SubWallet enforces minimum thresholds based on current network requirements and prevents underfunded submissions.

2. Review the gas estimation, transaction fee, and lock duration shown in the confirmation modal—no tokens are transferred off-chain or held by third parties.

3. Sign the transaction using your locally stored private key or hardware wallet integration; SubWallet never exposes seed phrases or signs remotely.

4. Monitor the contribution status via the “My Contributions” section, where each entry includes block height, extrinsic hash, and associated parachain ID.

5. Confirm final inclusion by checking the transaction on Polkadot.js Apps or Subscan using the displayed hash—SubWallet does not rely on centralized status polling.

Reward Claiming Workflow

1. After the parachain wins the slot and completes its lease term, SubWallet detects the unlock event through runtime event parsing and notifies users via in-app banner.

2. Access the original crowdloan detail page and locate the “Claim Rewards” button—this triggers retrieval of both native tokens and project-specific incentives if configured on-chain.

3. For projects distributing rewards via vesting schedules, SubWallet parses on-chain vesting contracts and displays claimable tranches with exact unlock timestamps.

4. Initiate reward claim by signing a vested.claim or tokens.transfer extrinsic depending on the reward mechanism deployed by the parallel chain.

5. Track claimed assets in the token portfolio view—SubWallet auto-detects newly supported tokens issued as crowdloan incentives without manual addition.

Security Verification Protocols

1. SubWallet cross-checks every crowdloan pallet ID against the canonical registry maintained by Polkadot Governance, rejecting entries with mismatched identifiers.

2. All crowdloan pages display verified contract source code hashes fetched directly from on-chain storage, enabling developers to audit logic prior to contribution.

3. The wallet disables contribution if the selected network does not match the parachain’s registered relay chain—preventing accidental KSM deposits into DOT-based auctions.

4. Before signing, SubWallet overlays a warning banner if the crowdloan has passed its refund deadline but remains unclaimed, prompting manual crowdloan.refund invocation.

5. Hardware wallet support mandates explicit user confirmation on device screen for every crowdloan-related extrinsic, eliminating silent signature risks.

Frequently Asked Questions

Q: Can I contribute using DOT stored in a Ledger hardware wallet through SubWallet?A: Yes—SubWallet supports Ledger Nano S/X/Z when connected via USB or Bluetooth, and signs crowdloan transactions directly on-device without exposing private keys.

Q: What happens if my chosen parachain fails to win a slot during the auction period?A: SubWallet automatically initiates the crowdloan.refund process after the auction concludes, returning 100% of contributed DOT/KSM minus nominal transaction fees.

Q: Does SubWallet support multi-signature crowdloan contributions?A: No—crowdloan participation requires single-signature control over the contributing account; multisig accounts must first transfer funds to a standard account before initiating contribution.

Q: How does SubWallet handle overlapping lease periods across multiple crowdloans?A: Each contribution is bound to a specific lease range encoded in the extrinsic; SubWallet isolates balances per lease window and prevents double-spending across concurrent campaigns.