Useful for when you need to check how far back you can get headers for. However, when using against a header node, this will only work on recent blocks. Since the bhn indexer only indexes by height and all other chain data is saved in memory, older blocks will not be found. Use getheaderbyheight method above instead when possible. If the initial sync is interrupted and restarted, you may notice your logs if they are on and set to level "spam" spitting out a bunch of messages about blocks being re-added to the chain.
This is the in-memory chain getting re-initialized from the headersindex. This is necessary for blocks after the network's lastCheckpoint since the chain db is used for certain contextual checks when syncing a node, for example handling re-orgs and orphan blocks. We take the header index data that is persisted and add these to the chain db so that they are available for these operations. The HeaderIndexer takes the place of the chain in several places for the Header Node to avoid some of this reliance on the chain that is not persisted.
The custom HeaderPool is extended from bcoin's default Pool object to replace calls to methods normally done by the chain that won't work given that there is no chain or in the case of a custom start point, not even a proper genesis block. The best example is getLocator which normally gets block hashes all the way back to genesis on the chain, but in our case will run the checks on the header index, and stop early if using a custom start point.
In the unlikely case that you are using a header node on regtest or simnet such as in the unit tests , it is not recommended to use a custom start height. The reason is that there are some different PoW checks that are done for testing networks to account for variance in mining hash power. Start height initialization will typically account for this on testnet and mainnet for example, but since regtest does not have a lastCheckpoint, this can make behavior a little weird.
For the tests, to confirm that the start height functionality works with checkpoints, we adjust the retarget interval down in some cases and set a custom lastCheckpoint rather than having to mine over 2k blocks which would slow the tests down. Apache License, Version 2. Skip to content. Star A lightweight node for syncing only bitcoin block headers from a specific height View license. 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. Git stats 48 commits. Failed to load latest commit information. View code. Installation Configuration options are the same as with bcoin. See the License for the specific language governing permissions and limitations under the License.
About A lightweight node for syncing only bitcoin block headers from a specific height Resources Readme. View license. Releases 1 tags. Packages 0 No packages published. You signed in with another tab or window. Blockchain and Cryptocurrency Advising clients where innovation and regulation collide.
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