Bridge FAQ

Common questions about the Sphera NFT Bridge.

General

Is the bridge safe?

Yes. The bridge uses secure smart contracts:

• On Hedera: Your NFT is locked (not burned) in a LockBox contract

• On Avalanche: A wrapped version is minted that you control

• You can always bridge back to recover your original NFT

What happens to my NFT when I bridge?

Hedera → Avalanche:

• Your original NFT is locked in a secure contract on Hedera

• A wrapped NFT with identical metadata is minted on Avalanche

• The wrapped NFT is sent to your specified address

Avalanche → Hedera:

• Your wrapped NFT is burned on Avalanche

• Your original NFT is unlocked on Hedera

• The original NFT is sent to your specified address

Can I bridge to a different wallet?

Yes! When bridging, you can specify a different destination address. This is useful for:

• Sending to a friend

• Moving to a different wallet you control

• Consolidating NFTs

Wallets

Why do I need two wallets?

• HashPack is needed for Hedera transactions (lock/unlock)

• MetaMask is needed for Avalanche transactions (mint/burn)

Both wallets must be connected for the bridge to work.

Can I use wallets other than HashPack?

Currently, HashPack is the recommended wallet for Hedera. We may add support for other Hedera wallets in the future.

Can I use wallets other than MetaMask?

Yes! Any EVM-compatible wallet works for Avalanche, including:

• MetaMask

• Rabby

• Rainbow

• WalletConnect-compatible wallets

Fees & Timing

How much does bridging cost?

Direction	Network Fee
Hedera → Avalanche	~1-2 HBAR
Avalanche → Hedera	~0.005-0.01 AVAX

Fees may vary based on network congestion.

How long does bridging take?

Typically 10-30 seconds for either direction. The process includes:

1. Your transaction on the source chain

2. Bridge verification

3. Transaction on the destination chain

Why is my transaction taking longer?

Possible reasons:

• Network congestion

• Wallet connection issues

• Browser/extension issues

Try refreshing the page or reconnecting your wallet.

Troubleshooting

My NFT is stuck / not appearing

1. Wait a few minutes - Blockchain indexing can take time

2. Refresh the page - The UI may need to reload

3. Check explorers:

   • HashScan for Hedera

   • Snowtrace for Avalanche

4. Contact support if stuck for more than 10 minutes

I bridged but didn't receive my NFT

This is rare but can happen if:

• Network issues interrupted the bridge

• The mint/unlock transaction failed

Contact support on Discord with your transaction hash and we'll help recover your NFT.

The bridge says "Transaction failed"

Common causes:

• Insufficient gas - Make sure you have enough HBAR/AVAX

• Wrong network - Ensure MetaMask is on Avalanche (not Ethereum)

• Wallet not connected - Reconnect both wallets

Can I cancel a bridge in progress?

Once a lock/burn transaction is confirmed, it cannot be cancelled. The bridge will complete the process automatically.

Technical

What are the contract addresses?

Hedera Mainnet (LockBox):

Collection	Address
Sphera Amateur	0x1018E39bc165a0c3CeB0001f466344d4139e9c68
Sphera Fan	0xe5C5b7ab701573eF0ADBf831C1F95Fb9723A3856
Sphera Ultras	0x47A22f1587809A0060Fd64527b489D48B8dfeFB1
Legacy Pass	0x71F295437F9A064E5ae65E6890a380f0efC31D02
Annual Pass	0x48A8684B279A132F2eCd021db9d63ecdccbC15B9

Avalanche Mainnet (WrappedNFT):

Collection	Address
Sphera Amateur	0xeF707625603652520ee77b14cd6C13BBbD6275C0
Sphera Fan	0xCFf5A923c5D427F7fc156F672CE08E562D5474C6
Sphera Ultras	0xA0Fc7Be4D48Ec8196a57Ab86267A89EDB30237A3
Legacy Pass	0x1018E39bc165a0c3CeB0001f466344d4139e9c68
Annual Pass	0x47A22f1587809A0060Fd64527b489D48B8dfeFB1

Is the bridge code open source?

The bridge frontend is available at github.com/Deca4Advisory-Code/sphera-layerzero-nft-bridge.