NFT Bridge Minter (Solana Program)

This Solana Anchor-based smart contract allows minting wrapped NFTs on Solana after verifying an Ethereum ECDSA signature. It acts as a trustless bridge for NFTs from Ethereum to Solana.

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Features

• Verifies Ethereum signatures using secp256k1_recover
• Ensures the message was signed by the rightful Ethereum address
• Mints a wrapped NFT to a Solana wallet
• Uses deterministic PDAs for mint & authority
• The Ethereum contract locks the NFT in an escrow.

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Structure

• Main Instruction: mint_wrapped_nft
• Accounts:
  • wrapped_asset_mint: The mint account for the wrapped NFT
  • mint_authority: PDA with mint authority
  • recipient_token_account: Token account receiving the wrapped NFT
  • recipient_owner: Solana wallet receiving the NFT
  • payer: The transaction fee payer

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How it Works

1. Ethereum signs a message , locks the NFT
2. This message is verified using Ethereum's ECDSA via secp256k1.
3. If verified, a wrapped NFT is minted to the provided Solana wallet.

Instruction: mint_wrapped_nft

pub fn mint_wrapped_nft(
 ctx: Context<MintWrappedNft>,
 eth_address: [u8; 20],
 original_token_id: String,
 original_nft_contract_info : String, 
 signature_r: [u8; 32],
 signature_s: [u8; 32],
 recovery_id: u8,
) -> Result<()>

4. Signature Verification We reconstruct the Ethereum-signed message and hash it using Keccak-256. The recovered public key is then converted to an Ethereum address and matched against the provided one

Build & Test

anchor build anchor test