Systems and methods are disclosed that cause a transient exchange ratio between digital assets at a kiosk, together with a countdown timer or other indication of how much time remains within which the ratio applies. If a transaction proceeds a voucher may be dispensed to confirm it. If a transaction participant using the kiosk is not yet vetted, the transaction is nevertheless deemed inchoate, and a prolonged vetting begins.

A method for a protocol in digital asset trading includes step as follow. Trading information is exchanged between the first and the second nodes, in which a first digital currency belonging to the first node and a second digital currency belonging to the second node are expected to be exchanged, and prices of the first and second digital currencies are time-dependent. An atomic swap script and a smart contract are generated. A compensation fee to be paid to the second node by the first node is computed. A redeeming or refunding event is performed in response to the atomic swap script and the smart contract with paying the compensation fee to the second node, in which the compensation fee is dependent on the prices of the first and second digital currencies such that is time-dependent.

A system and method for securing a private key transaction within blockchain that include receiving an input for initiating a financial transaction between a sender and a recipient. The system and method also include processing a secure wallet that is configured as an encrypted data packet that stores transaction data associated with the financial transaction and account information associated with the sender and the recipient. The system and method additionally include generating a first private key for the sender and a second private key for the recipient. The system and method further include generating a public key that includes encrypted data from the first private key and the second private key and includes the account information associated with the sender and the recipient that is used by at least one blockchain technology provider to pass the financial transaction through the blockchain.

A computer implemented method includes: receiving, by the computing system, a transaction authorization request, the transaction authorization request including a plurality of transaction conditions, the transaction authorization request relating to a request for a payment from a user's payment account to a recipient; provisioning, by the computing system, a plurality of limited-use payment tokens, each of the limited use payment tokens structured to expire according to a transaction condition; discarding, by the computing system, at least one limited-use payment token based on a determination that the at least one limited-use token is expired; receiving, by the computing system upon completion of a transaction, a limited-use payment token from the plurality of limited-use payment tokens; and transmitting, by the computing system to the recipient, a payment corresponding to the received limited-use payment token.

A method for propagating survival of cryptographic currency after inactivity over a predetermined period of time in a blockchain through the use of smart contracts includes: receiving a propagation request that includes unspent transaction output addresses, a digital signature, and a recipient address; generating a smart contract that is configured to self-execute after a predetermined period of time to initiate transfer of cryptographic currency from the output addresses to the recipient address; submitting the smart contract to a node in a blockchain network for addition to the blockchain; monitoring for new blockchain transactions involving any of the unspent transaction output addresses; generating a new smart contract to update the unspent transaction output addresses based on new blockchain transactions; and submitting the new smart contract to a node in a blockchain network after updating.

A piece of media is received. One or more preferences of a user is determined. Whether currency is captured in the piece of media is determined. Responsive to determining currency is captured in the piece of media, the currency is converted to an updated currency. The updated currency is provided to the user.

A virtual currency management device 50 is configured to: estimate a well-being value (WB value) as a mental activity level of a user A who participates in a give event E; store an amount of legal currency spent in the event E by the user A; generate virtual currency based on the estimated well-being value; store and manage the generated virtual currency in association with the user A; perform processing for selling the managed virtual currency to an investor I (third party), and buying out the virtual currency of the investor I; and set a conversion rate between the virtual currency and the legal currency to be used when the investor I buys or sells the virtual currency, such that the monetary value of the virtual currency increases relative to the legal currency as the stored amount of the legal currency is larger.

Systems and methods for expediting math-based currency (“MBC”) transactions are described. A financial institution facilitates the expedited MBC transactions. The expedited MBC transactions are achieved by guaranteeing merchants that a pending MBC transaction between the merchant and a customer will be verified by the MBC verification nodes. A provided guarantee can be collected on by the merchant in the event that a guaranteed MBC transaction is not verified by the MBC verification nodes.

A cryptocurrency based platform for supporting sustainable forest management is provided. The platform comprises a multitude of non-fungible tokens (NFTs), wherein each NFT corresponds to an individual or shared forest plot, said forest plot being subject to a binding agreement executed in exchange of issuing the NFT. Each issued NFT has a defined environmental value determined by at least a carbon sink value of the forest plot. Each issued NFT corresponds to a tradeable digital or physical NFT certificate having a scannable code that comprises information of the forest plot and the environmental value of the NFT.

In some embodiments, a method of managing value of assets is provided. A graphical representation of a digital asset associated with a non-fungible token stored in a distributed ledger is provided. User attention to the graphical representation of the digital asset is tracked, and a value of the digital asset is adjusted based on a level of attention of the tracked user attention and a number of users interacting with the graphical representation of the digital asset. A corresponding system and non-transitory computer-readable medium are also provided.