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chain

Purpose

Bitcoind/Bitcoin Core RPC utilities, including BitcoindRPCClient wrapping btcd rpcclient with extended methods like SubmitPackage for v3 transaction package relay.

Key Types

BitcoindRPCClient — Wraps an rpcclient.Client and adds SubmitPackage, a v3 parents+child package-relay call not yet exposed by the standard btcd RPC client.

Relationships

Depends on: btcd/rpcclient, btcd/btcjson, btcd/wire (RPC plumbing only; no other repo packages).
Depended on by: harness (test environment's BitcoindClient helper).

Invariants

SubmitPackage requires at least one parent transaction and a non-nil child; it errors immediately otherwise rather than forwarding a malformed request to bitcoind.
maxFeeRateBTCPerVByte is converted to BTC/kvB before being sent, matching bitcoind's submitpackage RPC parameter units.

Deep Docs

ARCHITECTURE.md — System-wide package map.