Abstract: A self-custody wallet combination payment card includes an electronic component with storage, a processor, and a near field communications interface. Two programs are stored at the electronic component and, once provisioned, the electronic component stores one or more blockchain addresses and security keys. The two programs can include a payment application which can interface with point of sale terminals (e.g., following EMV specifications) and a crypto application which has the capability to securely store keys and return a signature for blockchain transaction.

Abstract: A method for assisting wallet providers in regulatory compliance for blockchain transactions includes: receiving, by a receiver of a processing server, a new blockchain transaction from a first computing device, the new blockchain including at least a destination address associated with a blockchain wallet as a recipient for the new blockchain transaction; generating, by a processor of the processing server, a reference identifier for the new blockchain transaction; identifying, by the processor of the processing server, a profile for the blockchain wallet based on the destination address; transmitting, by a transmitter of the processing server, the reference identifier to the first computing device; and transmitting, by the transmitter of the processing server, a notification message to a second computing device, the notification message including at least the reference identifier and data associated with the blockchain wallet.

Abstract: A method for registration of an identified blockchain wallet using a payment card includes: receiving payment details for a payment card issued for a transaction account, the payment details including a card identifier and received from one of: an integrated circuit payment card and a financial application program; receiving wallet details for a blockchain wallet including a wallet identifier; transmitting the card identifier and the wallet identifier to an activation server that stores an association between the wallet identifier and the transaction account; receiving an activation message from the activation server; and transmitting an instruction to the integrated circuit payment card or the financial application program to enable use of a private key of a cryptographic key pair associated with the blockchain wallet.

Abstract: A method for facilitating permission-based cryptographic transactions across service providers includes: receiving an onboarding request including permission data and an identification value from a first computing system, the identification value being associated with a first blockchain wallet for a blockchain associated with a blockchain network; generating a permission token based on the permission data and an alias, the permission token including verified identity data points; transmitting the generated alias to the first computing system in response to the onboarding request; receiving a token request from a second computing system, the token request including the alias; and transmitting the generated permission token identification value to the second computing system in response to the token request.

Abstract: A swap check oracle receives a transfer request from a user or smart contract on a first blockchain indicating a first digital asset to be transferred. The swap check oracle verifies the authenticity of the user and/or digital asset and instructs the smart contract to transfer the first digital asset to a custodial blockchain address on the first blockchain. Another swap check oracle performs the same process for a second digital asset from a second user on a second blockchain. A central processing server is notified of the successful transfer of the digital assets to the custodial addresses on both blockchains, verifies the holding of the digital assets by the custodial addresses, and then initiates a release of the digital assets to the new parties on both of the blockchains.

Abstract: A method for assisting wallet providers in regulatory compliance for blockchain transactions includes: receiving, by a receiver of a processing server, a new blockchain transaction from a first computing device, the new blockchain including at least a destination address associated with a blockchain wallet as a recipient for the new blockchain transaction; generating, by a processor of the processing server, a reference identifier for the new blockchain transaction; identifying, by the processor of the processing server, a profile for the blockchain wallet based on the destination address; transmitting, by a transmitter of the processing server, the reference identifier to the first computing device; and transmitting, by the transmitter of the processing server, a notification message to a second computing device, the notification message including at least the reference identifier and data associated with the blockchain wallet.

Abstract: A method for assisting wallet providers in regulatory compliance for blockchain transactions includes: receiving, by a receiver of a processing server, a new blockchain transaction from a first computing device, the new blockchain including at least a destination address associated with a blockchain wallet as a recipient for the new blockchain transaction; generating, by a processor of the processing server, a reference identifier for the new blockchain transaction; identifying, by the processor of the processing server, a profile for the blockchain wallet based on the destination address; transmitting, by a transmitter of the processing server, the reference identifier to the first computing device; and transmitting, by the transmitter of the processing server, a notification message to a second computing device, the notification message including at least the reference identifier and data associated with the blockchain wallet.

Abstract: A self-custody wallet combination payment card includes an electronic component with storage, a processor, and a near field communications interface. Two programs are stored at the electronic component and, once provisioned, the electronic component stores one or more blockchain addresses and security keys. The two programs can include a payment application which can interface with point of sale terminals (e.g., following EMV specifications) and a crypto application which has the capability to securely store keys and return a signature for blockchain transaction.

Abstract: A method for assisting wallet providers in regulatory compliance for blockchain transactions includes: receiving, by a receiver of a processing server, a new blockchain transaction from a first computing device, the new blockchain including at least a destination address associated with a blockchain wallet as a recipient for the new blockchain transaction; generating, by a processor of the processing server, a reference identifier for the new blockchain transaction; identifying, by the processor of the processing server, a profile for the blockchain wallet based on the destination address; transmitting, by a transmitter of the processing server, the reference identifier to the first computing device; and transmitting, by the transmitter of the processing server, a notification message to a second computing device, the notification message including at least the reference identifier and data associated with the blockchain wallet.