Method, apparatus and electronic device for blockchain transactions

A system for implementing blockchain-based transactions, comprising a computing device associated with a remitter, a computing device associated with a receiver, and a plurality of blockchain nodes of a blockchain, each of which comprises 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 one or more processors to respectively perform operations comprising:

• selecting, by the computing device associated with the remitter, one or more blockchain assets from a blockchain account of a remitter associated with the blockchain according to a transaction amount (t) of a transaction to be remitted from the remitter's blockchain account into a blockchain account of a receiver associated with the blockchain;
• generating, by the computing device associated with the remitter, a commitment (T) of the transaction amount (t) by encrypting the transaction amount (t) based on a transaction random number (r);
• sending, by the computing device associated with the remitter, the transaction random number (r), the transaction amount (t), and the commitment (T) of the transaction amount (t) to the computing device associated with the receiver via a channel off the blockchain;
• generating, by the computing device associated with the receiver, a signature (SIGB) by signing at least the commitment (T) of the transaction amount (t) with a private key of the receiver;
• obtaining, by the computing device associated with the remitter from the computing device associated with the receiver via the channel off the blockchain, the signature (SIGB);
• generating, by the computing device associated with the remitter, a signature (SIGA) by signing at least the commitment (T) of the transaction amount (t) with a private key of the remitter;
• generating, by the computing device associated with the remitter, an updated version of the transaction, the updated version of the transaction comprising the signature (SIGA), the signature (SIGB), and the commitment (T) of the transaction amount (t);
• submitting, by the computing device associated with the remitter, the updated version of the transaction to the plurality of blockchain nodes of the blockchain for consensus verification;
• performing, by the plurality of blockchain nodes of the blockchain, the consensus verification on the updated version of the transaction, wherein the consensus verification comprises each of the blockchain nodes verifying the signature (SIGA) and the signature (SIGB);
• determining, by the plurality of blockchain nodes, that the consensus verification on the updated version of the transaction succeeds;
• and
• based on the determining, updating, by the plurality of blockchain nodes, a balance of the blockchain account of the remitter and a balance of the blockchain account of the receiver to remit the transaction amount (t) from the blockchain account of the remitter to the blockchain account of the receiver.

One or more non-transitory computer-readable storage media associated with a computing device associated with a remitter, a computing device associated with a receiver, and a plurality of blockchain nodes of a blockchain, wherein the media is configured with instructions executable by one or more processors to cause the one or more processors to perform operations comprising:

• selecting, by the computing device associated with the remitter, one or more blockchain assets from a blockchain account of a remitter associated with the blockchain according to a transaction amount (t) of a transaction to be remitted from the remitter's blockchain account into a blockchain account of a receiver associated with the blockchain;
• generating, by the computing device associated with the remitter, a commitment (T) of the transaction amount (t) by encrypting the transaction amount (t) based on a transaction random number (r);
• sending, by the computing device associated with the remitter, the transaction random number (r), the transaction amount (t), and the commitment (T) of the transaction amount (t) to the computing device associated with the receiver via a channel off the blockchain;
• generating, by the computing device associated with the receiver, a signature (SIGB) by signing at least the commitment (T) of the transaction amount (t) with a private key of the receiver;
• obtaining, by the computing device associated with the remitter from the computing device associated with the receiver via the channel off the blockchain, the signature (SIGB);
• generating, by the computing device associated with the remitter, a signature (SIGA) by signing at least the commitment (T) of the transaction amount (t) with a private key of the remitter;
• generating, by the computing device associated with the remitter, an updated version of the transaction, the updated version of the transaction comprising the signature (SIGA), the signature (SIGB), and the commitment (T) of the transaction amount (t);
• submitting, by the computing device associated with the remitter, the updated version of the transaction to the plurality of blockchain nodes of the blockchain for consensus verification;
• performing, by the plurality of blockchain nodes of the blockchain, the consensus verification on the updated version of the transaction, wherein the consensus verification comprises each of the blockchain nodes verifying the signature (SIGA) and the signature (SIGB);
• determining, by the plurality of blockchain nodes, that the consensus verification on the updated version of the transaction succeeds;
• and
• based on the determining, updating, by the plurality of blockchain nodes, a balance of the blockchain account of the remitter and a balance of the blockchain account of the receiver to remit the transaction amount (t) from the blockchain account of the remitter to the blockchain account of the receiver.