BLOCKCHAIN-BASED TRANSACTION METHOD AND APPARATUS, AND REMITTER DEVICE

1 . A method, comprising:

calculating a remitter balance commitment based on a remitter random number and a remitter balance of a remitter account;

calculating a remitter random number ciphertext by encrypting the remitter random number based on the remitter balance by using a homomorphic encryption algorithm; and

registering the remitter balance commitment and the remitter random number ciphertext with a blockchain.

2 . The method according to claim 1 , comprising:

calculating a remittee balance commitment based on a remittee random number and a remittee balance of a remittee account;

calculating a remittee random number ciphertext by encrypting the remittee random number based on the remittee balance by using the homomorphic encryption algorithm; and

registering the remittee balance commitment and the remittee random number ciphertext with the blockchain.

3 . The method according to claim 1 , comprising:

receiving a transaction commitment between the remitter account and a remittee account, the transaction commitment including a transaction commitment amount and a remitter commitment random number ciphertext;

updating the remitter balance commitment based on the transaction commitment amount; and

updating the remitter random number ciphertext based on the remitter commitment random number ciphertext.

4 . The method according to claim 3 , wherein:

the updating the remitter balance commitment includes calculating a quotient of the remitter balance commitment and the transaction amount commitment; and

the updating the remitter random number ciphertext includes calculating a quotient of the remitter random number ciphertext and the remitter commitment random number ciphertext;

5 . The method according to claim 3 , wherein:

the transaction commitment includes a remittee commitment random number ciphertext; and

the method further comprises:

updating the remittee balance commitment based on the transaction commitment amount; and

updating a remittee random number ciphertext based on the remittee commitment random number ciphertext.

6 . The method according to claim 5 , wherein:

the updating the remittee balance commitment includes calculating a product of the remittee balance commitment and the transaction amount commitment; and

the updating the remittee random number ciphertext includes calculating a product of the remittee random number ciphertext and the remittee commitment random number ciphertext.

7 . The method according to claim 3 , wherein the updating the remitter balance commitment based on the transaction commitment amount is conducted by a consensus node of a blockchain network that maintains the blockchain.

8 . A computing device comprising a processor and a memory, the memory storing executable instructions that are executable by the processor to enable the processor to implement acts including:

calculating a remitter balance commitment based on a remitter random number and a remitter balance of a remitter account;

calculating a remitter random number ciphertext by encrypting the remitter random number based on the remitter balance by using a homomorphic encryption algorithm; and

registering the remitter balance commitment and the remitter random number ciphertext with a blockchain.

9 . The computing device according to claim 8 , wherein the acts include:

calculating a remittee balance commitment based on a remittee random number and a remittee balance of a remittee account;

calculating a remittee random number ciphertext by encrypting the remittee random number based on the remittee balance by using the homomorphic encryption algorithm; and

registering the remittee balance commitment and the remittee random number ciphertext with the blockchain.

10 . The computing device according to claim 8 , wherein the acts include:

receiving a transaction commitment between the remitter account and a remittee account, the transaction commitment including a transaction commitment amount and a remitter commitment random number ciphertext;

updating the remitter balance commitment based on the transaction commitment amount; and

updating the remitter random number ciphertext based on the remitter commitment random number ciphertext.

11 . The computing device according to claim 10 , wherein:

the updating the remitter balance commitment includes calculating a quotient of the remitter balance commitment and the transaction amount commitment; and

the updating the remitter random number ciphertext includes calculating a quotient of the remitter random number ciphertext and the remitter commitment random number ciphertext;

12 . The computing device according to claim 10 , wherein:

the transaction commitment includes a remittee commitment random number ciphertext; and

the acts further include:

updating the remittee balance commitment based on the transaction commitment amount; and

updating a remittee random number ciphertext based on the remittee commitment random number ciphertext.

13 . The computing device according to claim 12 , wherein:

the updating the remittee balance commitment includes calculating a product of the remittee balance commitment and the transaction amount commitment; and

the updating the remittee random number ciphertext includes calculating a product of the remittee random number ciphertext and the remittee commitment random number ciphertext.

14 . The computing device according to claim 10 , wherein the computing device includes a consensus node of a blockchain network that maintains the blockchain.

15 . A non-transitory storage medium having computer executable instructions stored thereon, the computer executable instructions, when executed by a processor, configuring the processor to implement acts comprising:

calculating a remitter balance commitment based on a remitter random number and a remitter balance of a remitter account;

calculating a remitter random number ciphertext by encrypting the remitter random number based on the remitter balance by using a homomorphic encryption algorithm; and

registering the remitter balance commitment and the remitter random number ciphertext with a blockchain.

16 . The storage medium according to claim 15 , wherein the acts include:

calculating a remittee balance commitment based on a remittee random number and a remittee balance of a remittee account;

calculating a remittee random number ciphertext by encrypting the remittee random number based on the remittee balance by using the homomorphic encryption algorithm; and

registering the remittee balance commitment and the remittee random number ciphertext with the blockchain.

17 . The storage medium according to claim 16 , wherein the acts include:

receiving a transaction commitment between the remitter account and a remittee account, the transaction commitment including a transaction commitment amount and a remitter commitment random number ciphertext;

updating the remitter balance commitment based on the transaction commitment amount; and

updating the remitter random number ciphertext based on the remitter commitment random number ciphertext.

18 . The storage medium according to claim 17 , wherein:

the updating the remitter balance commitment includes calculating a quotient of the remitter balance commitment and the transaction amount commitment; and

the updating the remitter random number ciphertext includes calculating a quotient of the remitter random number ciphertext and the remitter commitment random number ciphertext;

19 . The storage medium according to claim 17 , wherein:

the transaction commitment includes a remittee commitment random number ciphertext; and

the acts further include:

updating the remittee balance commitment based on the transaction commitment amount; and

updating a remittee random number ciphertext based on the remittee commitment random number ciphertext.

20 . The storage medium according to claim 19 , wherein:

the updating the remittee balance commitment includes calculating a product of the remittee balance commitment and the transaction amount commitment; and

the updating the remittee random number ciphertext includes calculating a product of the remittee random number ciphertext and the remittee commitment random number ciphertext.