Methods and systems are disclosed for a digital signature system using scalable and reliable servers. The system includes multiple frontend servers that are each in communication with multiple backend servers. A remote application server sends a signature request to one of the front end servers. The signature request includes at least two public keys that each have a different server identifier embedded in them. The backend server extracts one of the server identifiers and tries the signature generating process with the corresponding back end server. If that that backend server does not respond, then the frontend server extracts the server identifier from another public key and initiates the signature generation process with that backend server. In some systems, the remote application server has a predefined relationship with multiple frontend servers so that if one frontend server is down, the application server can communicate with a backup frontend server.

An example operation may include one or more of initializing a smart contract (SC) and appending it to a blockchain, registering each of a plurality of participants as a party to the SC, receiving from at least some of the participants an encrypted confidential input commitment, appending the encrypted input commitments to the blockchain, decrypting the encrypted input commitments, executing by the SC at least one business rule using the decrypted input commitments to obtain a business rule result, and identifying a prevailing participant based at least in part on the business rule result.

A system for using hardware-secured receptacle devices includes a transfer processing device configured to store transfer method data associated with user on at least a cryptographically secured receptacle device, receive user authentication credentials from a user, authenticate user identity as a function of the user authentication credentials, retrieve a transfer authorization from the at least a cryptographically secured receptacle device as a function of the transfer method data, generate a transfer as a function of the transfer authorization.

There may be provided a computer-implemented method. It may be implemented using a blockchain such as, for example, the Bitcoin blockchain. The computer-implemented method includes: i) joining a congress by transferring, by a node operating in a proof-of-work blockchain network, one or more digital assets to a congress pool having one or more other digital assets associated with other members of a congress; ii) detecting, by the node, a special transaction of digital assets on the proof-of-work blockchain network to an address associated with the congress pool, the special transaction satisfying determined criteria; and iii) minting, by the node, one or more digital assets on a proof-of-stake blockchain network in response to detecting the special transaction.

A system and method for securing application programming interface (API) requests using multi-party digital signatures. The method includes generating, by a first system, at least one first secret share of a plurality of secret shares based on an API secret, wherein the plurality of secret shares includes the at least one first secret share and at least one second secret share, wherein the at least one second secret share is generated by at least one second system; and signing, by the first system, an API request using the at least one first secret share, wherein the API request is further signed by the at least one second system using the at least one second secret share, wherein the API request is signed without revealing any of the at least one first secret share to the at least one second system and without revealing any of the at least one second secret share to the first system.

The techniques described herein may provide an efficient and secure two-party distributed signing protocol, for example, for the IEEE P1363 standard. For example, in an embodiment, method may comprise generating, at a key generation center, a first partial private cryptographic key for a user ID and a second partial private cryptographic key for the user ID, transmitting the first partial private cryptographic key to a first other device, transmitting the second partial private cryptographic key to a second other device, and generating a distributed cryptographic signature for a message using the first partial private cryptographic key and the second partial private cryptographic key.

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.

A method of digitally signing a message is disclosed. The method comprises distributing first shares of a first secret value among a plurality of participants, wherein the first secret value is a private key accessible by means of a first threshold number of the first shares, and is inaccessible to less than the first threshold number of the first shares; distributing second shares of a second secret value among the participants, wherein the second secret value is an ephemeral key, wherein said ephemeral key is inaccessible to less than said first threshold number of said second shares; and distributing third shares of a third secret value among the participants, wherein each third share is adapted to be applied to a message to generate a respective fourth share of a fourth secret value, wherein the fourth secret value is the message signed with the private key and using the ephemeral key.

A method of controlling and coordinating of processing steps in a distributed system can be implemented by an initiator node of a cyclically-ordered set of nodes participating in a blockchain network (e.g., Bitcoin blockchain). The method includes generating a private key and cryptographic shares thereof for the nodes of the set and distributing them. A locking value is determined based on the shares and a transaction is arranged to transmit control of a resource responsive to supply of a corresponding unlocking value. A circuit of transactions amongst the nodes each arranged to transmit control of a resource responsive to supply of an unlocking value corresponding to a locking value determined based on the share distributed to a first node of one of two adjacent nodes and a value received from another node immediately previous to it is prepared. The initiator node may belong to a cyclically-ordered set of initiator nodes.