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Cairn Uses Blockchain Escrow to Let Aid Recipients Issue Their Own Receipts

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A developer has built Cairn, a weekend project written in roughly 4,500 lines of Rust, that rethinks how charitable donations are verified on the Solana blockchain. Traditional donation platforms only confirm that funds left the sender's account, but Cairn holds SOL in an escrow that can only be unlocked by a signature from the recipient's own wallet. Release of the funds requires the recipient to submit a voice recording stating what they received, with a hash of that recording committed on-chain and tied to the transaction. A command-line tool called 'cairn verify' allows anyone to independently re-hash the recording and confirm it matches the on-chain record, without relying on any central server. The project, currently running on Solana's devnet and not yet audited, is open-source under the MIT licence and has no frontend interface.

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