I don't know what crypto.com or KuCoin did, but here are some cryptographic schemes for proof of solvency Vitalik wrote up post-ftx collapse: https://vitalik.ca

I don't know what crypto.com or KuCoin did, but here are some cryptographic schemes for proof of solvency Vitalik wrote up post-ftx collapse: https://vitalik.ca/general/2022/11/19/proof_of_solvency.html https://vitalik.ca/general/2022/11/19/proof_of_solvency.html