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We propose a lean, stateless and functional transaction scheme to establishsecure delivery-versus-payment across two blockchains. Our approach eliminatesthe need for stateful intermediaries and ensures minimal overhead for thepayment chain operator, who does not need to store state. The main idea comeswith two requirements: First, a stateless decryption service is attached to thepayment chain that allows decrypting messages with the decryption serviceoperators secret key. Second, a "Payment Contract" is deployed on the paymentchain that implements a function transferAndDecrypt(uint256 id, address from,address to, string keyEncryptedSuccess, string keyEncryptedFail) that processesthe (trigger-based) payment, requests decryption, and emits the decrypted keydepending on the success or failure of the transaction. The respective key canthen trigger an associated transaction, e.g. claiming delivery by the buyer orre-claiming the locked asset by the seller. The stateless decryption servicecould be performed using a threshold description scheme, in which case therequirement of a single trusted entity would be removed.

A Stateless and Secure Delivery versus Payment across two Blockchains