There are many ways to access the database, for example, to get block headers by height and hash; in addition, it's possible to get a full block from the network using GetBlockFromNetwork by hash. However, the most useful methods are specifically tailored to scan the blockchain for data relevant to a wallet or a smart contract platform such as a Lightning Network node like lnd.
These are described below. Rescan allows a wallet to scan a chain for specific TXIDs, outputs, and addresses. A start and end block may be specified along with other options. If no end block is specified, the rescan continues until stopped. If no start block is specified, the rescan begins with the latest known block.
While a rescan runs, it notifies the client of each connected and disconnected block; the notifications follow the btcjson format with the option to use any of the relevant notifications. It's important to note that "recvtx" and "redeemingtx" notifications are only sent when a transaction is confirmed, not when it enters the mempool; the client does not currently support accepting 0-confirmation transactions.
GetUtxo allows a wallet or smart contract platform to check that a UTXO exists on the blockchain and has not been spent. It is highly recommended to specify a start block; otherwise, in the event that the UTXO doesn't exist on the blockchain, the client will download all the filters back to block 1 searching for it.
The client scans from the tip of the chain backwards, stopping when it finds the UTXO having been either spent or created; if it finds neither, it keeps scanning backwards until it hits the specified start block or, if a start block isn't specified, the first block in the blockchain. It returns a SpendReport containing either a TxOut including the PkScript required to spend the output, or containing information about the spending transaction, spending input, and block height in which the spending transaction was seen.
Calling Stop on the ChainService client allows the user to stop the client; the method doesn't return until the ChainService is cleanly shut down. Skip to content. Star This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Branches Tags. Could not load branches. Could not load tags. Latest commit. Cryptocurrency light- or simplified payment verification SPV clients allow nodes with limited resources to efficiently verify execution of payments. Instead of downloading the entire blockchain, only block headers and selected transactions are stored. Still, the storage and bandwidth cost, linear in blockchain size, remain non-negligible, especially for smart contracts and mobile devices: as of April , these amount to 50 MB in Bitcoin and 5 GB in Ethereum.
Recently, two improved sublinear light clients were proposed: to validate the blockchain, NIPoPoWs and FlyClient only download a polylogarithmic number of block headers, sampled at random. The actual verification of payments, however, remains costly: for each verified transaction, the corresponding block must too be downloaded. We present TxChain , a novel mechanism to maintain efficiency of light clients even under high transaction volumes. Specifically, we introduce the concept of contingent transaction aggregation , where proving inclusion of a single contingent transaction implicitly proves that n other transactions exist in the blockchain.
We deploy TxChain on Bitcoin without consensus changes and implement a hard fork for Ethereum. To demonstrate effectiveness in the cross-chain setting, we implement TxChain as a smart contract on Ethereum to efficiently verify Bitcoin payments. This is a preview of subscription content, access via your institution.
Polkadot polkadot. Back, A. Accessed 05 Jul Google Scholar. Fuzzati, R. PhD thesis Garay, J. In: Oswald, E. LNCS, vol. Springer, Heidelberg CrossRef Google Scholar. Gervais, A. ACM Heilman, E. Kiayias, A. In: Bonneau, J. FC Springer, Cham In: Katz, J. Nakamoto, S. Accessed 01 July Perez, D.
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A light client is a Bitcoin application, such as a wallet, that interacts with the Bitcoin network but does not store the blockchain. A light client or light node is a piece of software that connects to full nodes to interact with the blockchain. Unlike their full node. A bitcoin client is the end-user software that facilitates private key generation and security, payment sending on behalf of a private key, and.