Universal payment channel

A method comprising:

• transmitting, by a second service provider computer in communication with a second user device to a hub computer, a second user account identifier, wherein the second service provider computer is in communication with a second blockchain network containing a second smart contract, wherein the second smart contract is deployed on the second blockchain network in response to a request from the second service provider computer, and a second interaction channel is implemented between the hub computer and the second service provider computer, and wherein the hub computer is separately in communication with a first blockchain network comprising a first smart contract and the second blockchain network, and the hub computer is in communication with a first service provider computer via a first interaction channel and the hub computer is in communication with the second service provider computer via the second interaction channel;
• receiving, by the second service provider computer from the first service provider computer, an interaction request message;
• generating, by the second service provider computer, an interaction proposal comprising a second interaction channel identifier for the second interaction channel, an interaction expiry time, a first amount of a first digital currency, and a hash generated by hashing a secret known by the second service provider computer;
• transmitting, by the second service provider computer to the first service provider computer, the interaction proposal comprising the second interaction channel identifier, the interaction expiry time, the first amount of the first digital currency, and the hash;
• receiving, by the second service provider computer from the hub computer, a server promise comprising the first amount of the first digital currency, the hash, and a digital signature of at least the first amount of the first digital currency and the hash;
• verifying, by the second service provider computer using a public key associated with the hub computer, the digital signature of at least the first amount of the first digital currency and the hash;
• determining, by the second service provider computer, that an amount of a second digital currency equivalent to the amount of the first digital currency is less than a deposited amount to the second smart contract by the hub computer;
• providing, by the second service provider computer to the hub computer, the secret, wherein the hub computer verifies the secret;
• and
• receiving, by the second service provider computer, a receiver receipt in response to the verification of the secret by the hub computer,
• wherein the first interaction channel and the second interaction channel are off-chain channels.

A system comprising:

• one or more processors;
• and
• one or more non-transitory computer readable media comprising instructions executable by the processor to perform operations including,
• transmitting, by a second service provider computer in communication with a second user device to a hub computer, a second user account identifier, wherein the second service provider computer is in communication with a second blockchain network containing a second smart contract, wherein the second smart contract is deployed on the second blockchain network in response to a request from the second service provider computer, and a second interaction channel is implemented between the hub computer and the second service provider computer, and wherein the hub computer is separately in communication with a first blockchain network comprising a first smart contract and the second blockchain network, and the hub computer is in communication with a first service provider computer via a first interaction channel and the hub computer is in communication with the second service provider computer via the second interaction channel,
• receiving, by the second service provider computer from the first service provider computer, an interaction request message,
• generating, by the second service provider computer, an interaction proposal comprising a second interaction channel identifier for the second interaction channel, an interaction expiry time, a first amount of a first digital currency, and a hash generated by hashing a secret known by the second service provider computer,
• transmitting, by the second service provider computer to the first service provider computer, the interaction proposal comprising the second interaction channel identifier, the interaction expiry time, the first amount of the first digital currency, and the hash,
• receiving, by the second service provider computer from the hub computer, a server promise comprising the first amount of the first digital currency, the hash, and a digital signature of at least the first amount of the first digital currency and the hash,
• verifying, by the second service provider computer using a public key associated with the hub computer, the digital signature of at least the first amount of the first digital currency and the hash,
• determining, by the second service provider computer, that an amount of a second digital currency equivalent to the amount of the first digital currency is less than a deposited amount to the second smart contract by the hub computer,
• providing, by the second service provider computer to the hub computer, the secret, wherein the hub computer verifies the secret, and
• receiving, by the second service provider computer, a receiver receipt in response to the verification of the secret by the hub computer,
• wherein the first interaction channel and the second interaction channel are off-chain channels.