Example embodiments relate to methods of proving digital assets. The method includes identifying users on an asset transaction platform. The method includes generating a snapshot for each identified user at a first time. Each snapshot includes a user identity and user assets amount for the user at the first time. The user assets amount is a total amount of digital assets held by the user on the asset transaction platform at the first time. The method includes transforming each snapshot into a string combined hash value. Each string combined hash value is generated by hashing one of the snapshots of the user identity and the user assets amount for the first time. The method includes generating a merkle tree. The merkle tree includes a leaf node for each of the string combined hash values. The method includes performing an audit process of the asset transaction platform for the first time.

Example embodiments relate to performing activation techniques for contactless cards. For example, embodiments may include performing a near-field communication (NFC) exchange with a contactless card, processing a message comprising data to activate the contactless card, communicating the data to a server to activate the contactless card; and receiving a response from the server, the response to indicate whether the contactless card is successfully activated or not successfully activated.

A system for “tagging” funds identified on a blockchain and associating a weight value therewith. The tagging profile is developed into a propagation profile wherein weight values are inherited from the tagging profile s. Propagation profile funds may be diluted by combining with non-tagged funds, similar to how ink dilutes through water. A spending history of funds of interest is developed based on replaying the funds of interest against the global transaction history of the blockchain. It is determined whether the spending history intersects with the propagation profile, thus determining how closely the two sources of funds are economically to one another. Intersection triggers actions including alert notifications or transfer of funds on the blockchain.

Permissioned blockchains with off-chain storage establish integrity and no-later-than date-of-existence for documents, leveraging records containing hash values of documents. When a document's integrity or date is challenged, a new hash value is compared with a record in the blockchain. Proving date-of-existence (via hash value in a publication and/or SMS) for the block containing the record establishes no-later-than date-of-existence for the document. Permissioning monetizes operations, enforcing rules for submission rights and content, thereby precluding problematic material (privacy, obscenity, malicious logic, copyright violations) that threatens long-term viability. Compact records and off-chain storage in a document corral (with quarantine capability) preserve document confidentiality and ease storage burdens for distributed blockchain copies. Using multiple hash values for each document hardens against preimage attacks with quantum computing. Daisy chaining records establishes that relationships existed among documents at registration. Self-addressed blockchain registration (SABRe) permits documents to self-identify their blockchain record address (block ID, index).

Methods and systems for automatically conducting a continuous forward rate agreement in a cryptocurrency using smart contracts. An obligation object is generated and provided with control of a first smart contract, which may be a collateralized debt position smart contract, and control of a lender amount. The obligation object is executed to update balances for first and second parties until the obligation object is liquidated or terminated. Additional parties may be introduced. Upon liquidation or termination, the obligation object accounts to each of the parties based on their balances, and based on tokens generated to track positions in the obligation object.

Systems and methods of authenticating voice data using a ledger (blockchain). Examples include a scalable and seamless system that uses blockchain technologies to distribute trust of a conversation, authenticate persons in a conversation, track their characteristics and also to keep records of conversations. In some examples, smart phones, wearables, and Internet-of-Things (IoT) devices can be used to record and track conversations between individuals. These devices can each be used to create entries for the blockchain or a single device could be used to keep track of the entirety of the conversation. Fuzzy hashing may be used to compare newly created entries with previous entries on the ledger.

A method for preventing fraud in incentive transactions is provided that includes receiving metadata from a brand manufacturer for an incentive associated with a selected product, the metadata including a product identifier and a redemption rule. The method includes requesting a host to create a record in a distributed ledger for the incentive using the metadata, providing the incentive to a consumer via a mobile device, assigning a public address to the incentive, receiving from the host a first private key associated with the public address in the record, providing the first private key to the consumer, and receiving a second private key indicative of a redemption of the incentive at a retailer. The method includes validating redemption of the incentive and recording the redemption of the incentive at a retailer in the distributed ledger record when the redemption of the incentive is validated. A system to perform the above method is also provided.

A first node on the blockchain storage system node may include data from other blocks on the blockchain used for blockchain verification and an additional node which may include an analysis element. The analysis element may include computer executable code for receiving data added to the blockchain, determining a risk score for the data added to the blockchain based on past performance and in response to the risk score being over a threshold, alerting members of blockchain of the risk score.

A system for making digital signatures includes plural signers determining cleartext bits to sign in response to a hash of a pre-image known to the respective signer and message. Another system uses one-way functions and a plurality of authentication paths per signature. A key information distribution system uses physical media, physical media revealing means, and changing the configuration of the physical media revealing means to reveal secret indicia to observers.

It is provided the technology to ensure the execution of proper transactions. One aspect of the present disclosure is an escrow system that includes a group of nodes and a blockchain network that connects each node of the group of nodes. In the escrow system, an escrow node sets, with respect to a transaction relating to a product or a service between a user and a first node, a multi-signature address between the first node and the escrow node in the blockchain network. The first node, in response to a completion notification of payment of a cost relating to the transaction by the user to the escrow node, executes the transaction and transmits a signature and a fulfillment notification of the transaction to the multi-signature address. The escrow node, in response to an execution of the transaction by the first node, transmits a signature and a fulfillment notification of the transaction to the multi-signature address. The first node, in response to the signature and the fulfillment notification of the transaction from the first node and the escrow node to the multi-signature address, receives a payment notification of the cost.