Blockchain-based cross-currency settlement methods, apparatuses, and devices

A system for blockchain-based cross-currency settlement, comprising one or more processors and one or more non-transitory computer-readable memories coupled to the one or more processors and configured with instructions executable by the one or more processors to cause the system to perform operations comprising:

• in response to a determination that first off-chain funds of a first currency transferred by a first settlement node to a first settlement account are in a frozen state, adding a first blockchain asset corresponding to the first off-chain funds of the first currency to a blockchain account of a transit node in a blockchain network, wherein the first settlement node is inside a territory and the first settlement account is opened by the transit node at the first settlement node;
• in response to a determination that second off-chain funds of a second currency different from the first currency transferred by a second settlement node to a second settlement account are in a frozen state, adding a second blockchain asset corresponding to the second off-chain funds of the second currency to the blockchain account of the transit node in the blockchain network, wherein the second settlement node is outside the territory and the second settlement account is opened by the transit node at the second settlement node;
• receiving a fund exchange transaction sent by the transit node, the fund exchange transaction created by the transit node according to fund exchange instructions from the first settlement node and the second settlement node;
• and
• in response to receiving the fund exchange transaction:
• transferring the first blockchain asset from a blockchain account corresponding to the transit node to a blockchain account corresponding to the second settlement node, and
• transferring the second blockchain asset from the blockchain account corresponding to the transit node to a blockchain account corresponding to the first settlement node to perform, by the first settlement node or the second settlement node, cross-currency fund settlement.

One or more non-transitory computer-readable storage media storing instructions for blockchain-based cross-currency settlements, wherein the instructions are executable by one or more processors and execution of the instructions causes the one or more processors to perform operations comprising:

• in response to a determination that first off-chain funds of a first currency transferred by a first settlement node to a first settlement account are in a frozen state, adding a first blockchain asset corresponding to the first off-chain funds of the first currency to a blockchain account of a transit node in the blockchain network, wherein the first settlement node is inside a territory and the first settlement account is opened by the transit node at the first settlement node;
• in response to a determination that second off-chain funds of a second currency different from the first currency transferred by a second settlement node to a second settlement account are in a frozen state, adding a second blockchain asset corresponding to the second off-chain funds of the second currency to the blockchain account of the transit node in the blockchain network, wherein the second settlement node is outside the territory and the second settlement account is opened by the transit node at the second settlement node;
• receiving a fund exchange transaction sent by the transit node, the fund exchange transaction created by the transit node according to fund exchange instructions from the first settlement node and the second settlement node;
• and
• in response to receiving the fund exchange transaction:
• transferring the first blockchain asset from a blockchain account corresponding to the transit node to a blockchain account corresponding to the second settlement node, and
• transferring the second blockchain asset from the blockchain account corresponding to the transit node to a blockchain account corresponding to the first settlement node to perform, by the first settlement node or the second settlement node, cross-currency fund settlement.