Cryptographic encryption protocol for data types and values

A method comprising:

• initiating a cryptographic blockchain exchange between a first user and a second user, wherein the first user and the second user each having a respective cryptographic key pair including a public key and a private key, the cryptographic blockchain exchange including a first operand, a second operand, and a third operand wherein the first and second operands are associated with an amount of the cryptographic blockchain exchange and the third operand is associated with an asset type of the cryptographic blockchain exchange;
• establishing a first account asset type ciphertext associated with the first user, wherein the first account asset type ciphertext encrypts an asset type associated with the first user;
• establishing a second account asset type ciphertext associated with the second user, wherein the second account asset type ciphertext encrypts an asset type associated with the second user;
• providing to the cryptographic blockchain exchange the first operand, the second operand, and the third operand, wherein the first and second operands originate from different respective sources;
• encrypting the first operand with a first public key associated with the first user, thereby generating a first ciphertext;
• encrypting the second operand and the third operand with a second public key associated with the second user, thereby generating a second ciphertext and a third ciphertext respectively;
• confirming, via zero-knowledge proof, that the first ciphertext and the second ciphertext have matching plaintext values;
• identifying, via zero-knowledge proof, that the third ciphertext and the first account asset type ciphertext associated with the first user have matching plaintext asset types;
• verifying, via zero-knowledge proof, that the third ciphertext and the second account ciphertext associated with the second user have matching plaintext asset types;
• and
• in response to said confirming, identifying, and verifying, executing the cryptographic blockchain exchange on an immutable public ledger wherein the first ciphertext, the second ciphertext, and the third ciphertext are published, and wherein the amount of the cryptographic blockchain exchange is transferred from the first user to the second user.

A system comprising:

• a first node on a cryptographic network, the first node associated with a first user having a first cryptographic wallet and wherein the first user is identified by a first cryptographic keypair including a first public key and a first private key;
• a second node on a cryptographic network, the second node associated with a second user having a second cryptographic wallet and wherein the second user is identified by a second cryptographic keypair including a second public key and a second private key;
• and
• a distributed, immutable public ledger configured to store cryptographic transaction records;
• wherein the first node is configured to initiate a cryptographic blockchain exchange between the first user and the second user, and wherein the first node is configured to receive values associated with a first operand, a second operand, and a third operand and the values associated with the first operand and the second operand originate from different users, wherein the first and second operands are associated with an amount of the cryptographic blockchain exchange and the third operand is associated with an asset type of the cryptographic blockchain exchange;
• wherein the first node is configured to establish a first account asset type ciphertext associated with the first user, wherein the first account asset type ciphertext encrypts an asset type associated with the first cryptographic wallet;
• wherein the second node is configured to establish a second account asset type ciphertext associated with the second user, wherein the second account asset type ciphertext encrypts an asset type associated with the second cryptographic wallet;
• wherein the first node is configured to encrypt the first operand with the first public key thereby generating a first ciphertext, and encrypt the second operand and the third operand with the second public key thereby generating a second ciphertext and a third ciphertext respectively, and to confirm, via zero-knowledge proof, that the first ciphertext and the second ciphertext have matching plaintext values, and to identify, via zero-knowledge proof, that the third ciphertext and the first account asset type ciphertext have matching plaintext asset types;
• wherein the second node is configured to verify that the third ciphertext and the second account asset type ciphertext have matching plaintext asset types;
• and
• wherein the distributed immutable public ledger is configured to execute the cryptographic blockchain exchange in response to said verification by the second node, and wherein the distributed immutable public ledger is configured to publish the first ciphertext, the second ciphertext, and the third ciphertext, and wherein the amount of the cryptographic blockchain exchange is transferred from the first cryptographic wallet to the second cryptographic wallet.