Understanding Sub-1 sat/vB Bitcoin Transactions
The 1 sat/vB Minimum Standard
Bitcoin fees are measured in satoshis per virtual byte (sat/vB). Most network nodes enforce a default relay policy requiring ≥1 sat/vB to:
Ensure miner incentives
Discourage transaction spam
Maintain efficient mempool operation
How Sub-1 sat/vB Transactions Function
Not publicly relayed: Ignored by standard nodes; excluded from public mempools.
Confirmation requirements:
Direct submission to miners, or
Private relay services (e.g., Slipstream).
Unpredictable inclusion: Miners rarely prioritize these. Confirmation occurs only during low congestion if miners accept sub-1 sat policies.
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