System and method of cryptographic key management in a plurality of blockchain based computer networks

A method of cryptographic key distribution in a plurality of computer networks, wherein the plurality of computer networks is a plurality of blockchain-based computer networks, with a server in communication with the plurality of computer networks, wherein a first computing device controls a first threshold signature address on a first computer network with a first portion of a first cryptographic key in combination, with a second portion of the first cryptographic key controlled by the server, wherein a second computing device controls a second threshold signature address on a second computer network, with a first portion of a second cryptographic key in combination with a second portion of the second cryptographic key, controlled by the server, the method comprising:

• generating, by the first computing device, a fifth threshold signature address on the first computer network, wherein a combination of a first portion of a fifth cryptographic key controlled by the first computing device with a second portion of the fifth cryptographic key controlled by the second computing device and with a third portion of the fifth cryptographic key controlled by the server corresponds to the fifth threshold signature address;
• generating, by the second computing device, a sixth threshold signature address on the second computer network, wherein a combination of a first portion of a sixth cryptographic key controlled by the second computing device with a second portion of the sixth cryptographic key controlled by the first computing device and with a third portion of the sixth cryptographic key controlled by the server corresponds to the sixth threshold signature address;
• signing a third transaction on the first computer network with data exchange between the first threshold signature address and the fifth threshold signature address when the one or more details of the third transaction are validated by the server, comprising:
• signing the third transaction, by the first computing device, using the first portion of the first cryptographic key corresponding to the first threshold signature address;
• and
• signing the third transaction, by the server, using the second portion of the first cryptographic key;
• signing a fourth transaction on the second computer network with data exchange between the second threshold signature address and the sixth threshold signature address when the one or more details of the fourth transaction are validated by the server, comprising:
• signing the fourth transaction, by the second computing device, using the first portion of the second cryptographic key corresponding to the second threshold signature address;
• and
• signing the fourth transaction, by the server, using the second portion of the second cryptographic key;
• sharing, by the first computing device, the first portion of the fifth cryptographic key with the second computing device, when the one or more details of the third transaction are validated by the server;
• and
• sharing, by the second computing device, the first portion of the sixth cryptographic key with the first computing device, when the one or more details of the fourth transaction are validated by the server.