Series 2 is the Solana edition of the OnchainTCG Membership Pass.
The pass mints to the wallet you connect, and the USDC comes from it. Phantom, Solflare, Backpack and any Wallet-Standard wallet all work.
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Both move in a single transaction together with the mint, so you either get your pass or nothing happens at all. One signature.
Series 1 lives on BNB Smart Chain (see it here) and is still available there. Series 2 is the same set of tiers issued on Solana, for collectors who live on Solana — no account linking and no bridge to use one. Both are official; the two collections name each other on chain.
Series 2 perks are still being set and need not match Series 1's.