Blockchain transactions with ring signatures

A non-transitory, computer-readable medium storing one or more instructions that, when executed by a computing device communicably coupled to a blockchain network or in the blockchain network, cause the computing device to perform operations comprising:

• assembling a remittance transaction based on one or more to-be-spent assets in an account corresponding to a first remitter in the remittance transaction, one or more assets in an account corresponding to a fake remitter, and one or more encrypted transfer amounts, each encrypted transfer amount corresponding to a transfer amount corresponding to a respective payee of one or more payees in the remittance transaction, wherein assets of the first remitter, assets of the fake remitter, and assets of the one or more payees are in a blockchain ledger of the blockchain network,
• wherein the first remitter is a real participant in the remittance transaction, the fake remitter is a fake participant in the remittance transaction, and the one or more payees comprise one or more real payees, the one or more real payees being real participants in the remittance transaction;
• maintaining a private key of the first remitter and a public key of the first remitter;
• generating a plurality of key images, a value of each key image being cryptographically related to the private key of the first remitter, the public key of the first remitter, and a respective asset identifier of a to-be-spent asset of the one or more to-be-spent assets;
• generating one or more other values based on a public key of the fake remitter;
• and
• submitting the remittance transaction and a linkable ring signature to the blockchain network, wherein the linkable ring signature comprises the generated plurality of key images and the generated one or more other values.

A computer-implemented system, comprising:

• one or more computers communicably coupled to a blockchain network or in the blockchain network;
• and
• one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, cause the one or more computers to perform operations comprising:
• assembling a remittance transaction based on one or more to-be-spent assets in an account corresponding to a first remitter in the remittance transaction, one or more assets in an account corresponding to a fake remitter, and one or more encrypted transfer amounts, each encrypted transfer amount corresponding to a transfer amount corresponding to a respective payee of one or more payees in the remittance transaction, wherein assets of the first remitter, assets of the fake remitter, and assets of the one or more payees are in a blockchain ledger of the blockchain network,
• wherein the first remitter is a real participant in the remittance transaction, the fake remitter is a fake participant in the remittance transaction, and the one or more payees comprise one or more real payees, the one or more real payees being real participants in the remittance transaction;
• maintaining a private key of the first remitter and a public key of the first remitter;
• generating a plurality of key images, a value of each key image being cryptographically related to the private key of the first remitter, the public key of the first remitter, and a respective asset identifier of a to-be-spent asset of the one or more to-be-spent assets;
• generating one or more other values based on a public key of the fake remitter;
• and
• submitting the remittance transaction and a linkable ring signature to the blockchain network, wherein the linkable ring signature comprises the generated plurality of key images and the generated one or more other values.