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Exchanging data while ensuring non-repudiation is a challenge, especially ifno trusted third party exists. Blockchain promises to provide many of therequired guarantees, which is why it has been used in many non-repudiable dataexchange protocols. Specifically, some authors propose to append data toblockchain to achieve non-repudiation of receipt.  In this position paper, we show that this approach is insufficient. Whileappending data to blockchain can guarantee non-repudiation of origin in somecases, it is not sufficient for non-repudiation of receipt. For confidentialdata, we find a catch-22 that makes it impossible. For non-confidential data,meanwhile, plausible deniability remains. We discuss potential solutions andsuggest smart contracts as a promising approach.

Appending Data to Blockchain is not Sufficient for Non-repudiation of Receipt