utxo

database could not have heard of the lock. When we do a transaction, all records of the session change before committing are locked and cannot be modified by other sessions.In a centralized database, because each ledger node operates local data, the change information is transferred asynchronously, so there is no global lock to notify others when a change is recorded. Therefore, in the absence of a lock on the premise, to the central database, that is, blockchain how to ensure the consistency o

itself and is not required to be authenticated.And the account interface is required to authenticate the account. 4. Basic Ledger Design Contains the following questions:Whether the prototype block chain has met the demand.If for the ether, basically do not need to change the basic ledger, just build smart contract can be.How to base on Bitcoin system, there may be a big change. Do not meet the requirements of how to change the basic ledger.This actually depends on the account model, if the use

0x00 Summary After the analysis of the previous 20 chapters, we are getting closer to the core function of Bitcoin, which is its consensus, transaction processing, and so on. Although the front is basically doing some initialization of the work, but these work for the overall operation of the bitcoin is essential, and as before the signal processing, concurrency and so on are worth learning part, this chapter mainly introduces the step in the Appinitmain 6, the code is a little bit longer so it

, or exit within 7 days. The recall (also called exit) exits processing in the order in which the transaction was created. The unused transaction output (UTXO) references a low block height transaction (that is, older transactions) that is contained in the parent chain higher than the priority of the transaction contained in the updated block. This leads to the withdrawal of the reference to the recently included invalid transaction, which is lower th

Brief introduction The nonce value exists primarily because it is account-based and differs from the Utxo-based bitcoin. Nonce values are primarily used to prevent replay attacks. An external account is sent a nonce plus one per transaction. Each contract account creates a nonce plus one. The value of the nonce is the same as when the contract calls the other contract for internal invocation. the number of rules used in a nonce when the nonce is too

emphasize that not all services must be blockchain, the author conceived a general umbrella-type structure, such as Bitcoin side-chain technology, the main chain to provide basic ledger services, side-chaining to provide specific scene services, side-chain applications can be non-blockchain implementation, just interface registration can. B, interactive interface design In the interface design, it is recommended to use the current industry-wide JSON-RPC interface, both extensibility and fri

. they are sent to all devices connected to the network. Once the data is uploaded to all devices, the user can reach agreement with the results of executing the program code. The database is then updated to record the execution of the contract and to oversee the terms of the contract to check compliance. [2] 0x02 solidity Solidity is a high-level language that is syntactically similar to JavaScript and is designed to generate Ethereum virtual machine (Ethereum MACHINE,EVM) code in a compiled fa