Abstract: A plurality of computer-based transactions facilitated by each of a plurality of custodians are monitored. A first transaction of the plurality of transactions includes a transfer of an amount of cryptocurrency of a first type by a first counterparty to a second counterparty in exchange for an amount of cryptocurrency of a second, different type. Transaction packages are generated by each counterparty which include requisite information to effect the transfer. A settlement coordinator asynchronously receives (via a computing network) the transaction packages which specify information required to (i) transfer the cryptocurrency of the first type from the first counterparty to the second counterparty on a first blockchain and (ii) transfer the cryptocurrency of the second type from the second counterparty to the first counterparty on a second blockchain.