fix: use HTTP fallback for broadcast when WebSocket connections unava…

[samholmes]

…ilable

Previously, broadcastTx would fail immediately with 'Missing WebSocket connections' error when serverStatesCache was empty, never reaching the HTTP/REST fallback code. Now the HTTP fallback via NowNodes is always attempted when WebSocket broadcast isn't possible.

CHANGELOG

Does this branch warrant an entry to the CHANGELOG?

• Yes
• No

Dependencies

none

Description

none

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Note

Ensures broadcastTx falls back to HTTP (NOWNodes) when no Blockbook WebSocket is connected, and updates the changelog.

• Engine (UTXO):
  • Update broadcastTx in src/common/utxobased/engine/ServerStates.ts:
    • Remove early rejection on missing WebSocket instances.
    • If no connected Blockbook sockets, attempt HTTP broadcast via NOWNodes (/api/v2/sendtx/) with nowNodesApiKey.
    • Add error handling for missing key or no available HTTP servers; improve logging.
• Docs:
  • Update CHANGELOG.md Unreleased with the HTTP fallback fix.

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