Abstract: An example operation may include one or more of connecting, by an attester node, to a source blockchain network configured to store hashes of source blocks, collaboratively coupling, by the attester node, the source blockchain network with a target blockchain network configured to store hashes of target blocks, receiving, by the attester node, a request from the source blockchain network to store the hash of the source block on the target blockchain network, confirming, by the attester node, that the source network has a previously stored hash of the target block, in response to the confirmation that the source blockchain network has a previously stored hash of the target block, allowing, by the attester node, to store the hash of the source block on the target blockchain network, and continuing, by the attester node, a collaboration between the source blockchain network and the target blockchain network.

Abstract: An example operation may include one or more of selecting, by a peer, a block from a blockchain based on a selected smart contract of a plurality of smart contracts, requesting, by the peer, transactions associated with the selected smart contract, confirming, by the peer, that received transactions associated with the selected smart contract belong to the selected block, verifying, by the peer, that all of the requested transactions associated with the selected smart contract have been received, and synchronizing, by the peer, the selected smart contract based on the received transactions.

Abstract: An example operation may include one or more of receiving, by a committer node or peer of a blockchain network, a block comprising a lock request that locks a partial state of a smart contract, the lock request comprising a submitter identifier and a lock delay, the committer node or peer configured to process blocks of transactions, the method further comprising, validating the lock request, committing transactions comprising the submitter identifier with no delay, and committing transactions not comprising the submitter identifier after the lock delay.

Abstract: An example operation may include one or more of receiving, by a broadcast server node, data from a plurality of data provider nodes; and executing, by the broadcast server node, a smart contract to: encrypt the data with encryption keys; generate a broadcast queue based on the encrypted data; and assign a subset of consumer nodes authorized to receive the encrypted data of the broadcast queue.

Abstract: An example operation may include one or more of computing historical patterns related to fraudulent attempts from a transaction log, predicting future fraud attempts from public data, correlating the historical patterns and the predicted future fraud attempts, modifying one or more first endorsement policies based on the correlations, preventing modifying one or more second endorsement policies, the one or more second endorsement policies providing read-only access, and adding the modified one or more first endorsement policies to a smart contract.

Abstract: An example operation may include one or more of computing historical patterns related to fraudulent attempts from a transaction log, predicting future fraud attempts from public data, correlating the historical patterns and the predicted future fraud attempts, modifying one or more endorsement policies based on the correlations, and adding the modified one or more endorsement policies to a smart contract.

Abstract: An example operation may include one or more of sending a transmission process from a client with an application, the application coupled to the client, receiving the transmission process from the client via a multistate peer network, the multistate peer network includes a ledger, an endorsement policy, and a smart contract, generating, from the transmission process, a multistate endorsement based ledger process, establishing a threshold state logic and a final state logic via the smart contract, the threshold state logic is set by the minimum number of endorsements required to commit to the ledger set by the endorsement policy, a commitment to the ledger triggers the final state logic, and executing post-settlement processes via the final state logic.

Abstract: An example operation may include one or more of storing chaincode that comprises a plurality of statements to be executed, receiving a message to endorse a blockchain storage request, delaying execution of one or more statements within the chaincode based on content included within the chaincode, endorsing the blockchain storage request via execution of remaining statements included in the chaincode which are not delayed to generate an endorsement result, and transmitting the endorsement result to a node.

Abstract: An example operation may include one or more of identifying a new member (M1) to a permissioned database, creating a new group including the new member and one or more previously identified members (MP), modifying a world state of the permissioned database to identify a set of members in the new group with access to the permissioned database, and responsive to the new member (M1) being identified, creating a new entry (TX1) to the permissioned database using an encryption key (K1) associated with the new member (M1).

Abstract: An example operation may include one or more of storing a broadcast encryption tree comprising a set of cryptographic keys disposed in a hierarchical tree format, distributing a partial set of keys from the broadcast encryption tree to each respective peer from among a group of peers included in a blockchain network, receiving, from a user device, an identification of at least one peer included in the group of peers for processing a blockchain transaction, selecting a subset of keys from among the set of cryptographic keys in the broadcast encryption tree which enables at least one peer to decrypt transactions and doesn't enable the remaining peers included in the group of peers to decrypt transactions, and transmitting broadcast encryption information about the selected subset of keys to the user device for performing encryption of the transactions.

Abstract: An example operation may include one or more of identifying a blockchain transaction, storing the blockchain transaction in a blockchain, assigning the blockchain transaction a transaction number and a block number, hashing a portion of blockchain transaction data associated with the blockchain transaction, and updating a blockchain index based on the hashed portion of the blockchain transaction.

Abstract: A method, computer system, and a computer program product for communicating between a bicycle and a vehicle to prevent vehicle open door accidents is provided. The present invention may include collecting data from a bicycle device associated with the bicycle. The present invention may also include determining the vehicle is involved in at least one high-risk activity. The present invention may then include determining the bicycle is in a proximity of the vehicle involved in the at least one high-risk activity. The present invention may further include transmitting, by the bicycle device, a plurality of proximity alerts to the vehicle involved in the at least one high-risk activity.

Abstract: An example operation may include one or more of registering data values, by a plurality of IoT devices, each IoT device associated with one of at least two different cloud storages, the registration of the data values having a relative order, and only one measurement being made for each IoT device per measurement at a given point in time, and proving a common ordering of at least some of the data values registered by the plurality of IoT devices, by a client application of a client device.

Abstract: An example operation may include one or more of connecting, by an attester node, to a source blockchain network configured to store hashes of source blocks, collaboratively coupling, by the attester node, the source blockchain network with a target blockchain network configured to store hashes of target blocks, receiving, by the attester node, a request from the source blockchain network to store the hash of the source block on the target blockchain network, confirming, by the attester node, that the source network has a previously stored hash of the target block, in response to the confirmation that the source blockchain network has a previously stored hash of the target block, allowing, by the attester node, to store the hash of the source block on the target blockchain network, and continuing, by the attester node, a collaboration between the source blockchain network and the target blockchain network.

Abstract: An example operation may include one or more of generating evidence for a set of transactions, wherein the generating of the evidence comprises identifying one or more blocks containing one or more of the transactions in the set of transactions, and generating a branch of a hash tree of the set of transactions for each of the one or more blocks.

Abstract: An example operation may include one or more of connecting, by an attester node, to a blockchain network A configured to store hashes of blocks A, coupling, by the attester node, the blockchain network A with a blockchain network B configured to store hashes of blocks B, receiving, by the attester node, a request from the blockchain network A to send a hash of a block A produced at a time t1 (AHash_1) to the blockchain network B, confirming, by the attester node, that the blockchain network A has stored a hash of a block B produced at a time t0 (BHash_0), sending, by the attester node, the AHash_1 to the blockchain network B to be stored, receiving, by the attester node, a hash of the block B produced at the time t1 (BHash_1) from the blockchain network B, confirming, by the attester node, that the blockchain network B has stored a hash of a block A produced at the time t0 (AHash_0), and providing, by the attester node, the BHash_1 to the blockchain network A to be stored, wherein the t0 is less than the t1.

Abstract: An example operation may include one or more of identifying a blockchain transaction, storing the blockchain transaction in a blockchain, assigning the blockchain transaction a transaction number and a block number, hashing a portion of blockchain transaction data associated with the blockchain transaction, and updating a blockchain index based on the hashed portion of the blockchain transaction.

Abstract: An example operation may include one or more of storing a broadcast encryption tree comprising a set of cryptographic keys disposed in a hierarchical tree format, distributing a partial set of keys from the broadcast encryption tree to each respective peer from among a group of peers included in a blockchain network, receiving, from a user device, an identification of at least one peer included in the group of peers for processing a blockchain transaction, selecting a subset of keys from among the set of cryptographic keys in the broadcast encryption tree which enables at least one peer to decrypt transactions and doesn't enable the remaining peers included in the group of peers to decrypt transactions, and transmitting broadcast encryption information about the selected subset of keys to the user device for performing encryption of the transactions.

Abstract: An example operation may include one or more of receiving an asset from an asset owner, initiating an integrity of the asset and entering the asset into a primary chain of genesis, signing the asset and locking the asset in the primary chain of genesis, manifesting the asset as a linked asset in a derivative chain of genesis, detecting a timeout of the asset in the primary chain of genesis, ending a life cycle of the asset in the primary chain of genesis, and creating a new asset in the derivative chain of genesis based on the asset.

Abstract: An example operation may include one or more of connecting, by an asset server, to a source blockchain configured to store a digital asset of an asset owner, enciphering and locking, by the asset server, the asset in the source blockchain, manifesting, by the asset server, the asset as a linked asset in a target blockchain, tracking, by the asset server, a life cycle of the asset, detecting, by the asset server, an end of the life cycle of the asset, reflecting, by the asset server, the end of the life cycle of the asset in the source blockchain, and creating, by the asset server, the asset in the target blockchain.