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Bitcoin Timelock

Try a block-delay simulator to see how a future spending path might be scheduled, without risking funds.

BLOCK-HEIGHT LAB · EDUCATIONAL ONLY

When might a delayed path become available?

ESTIMATED UNLOCK HEIGHT—Loading the latest block…

About ten minutes per block is only a long-run average. Real arrival time can differ substantially. This demonstration does not create or validate a timelock transaction.

Two clocks inside Bitcoin

Absolute timelocks can refer to a block height or time. Relative timelocks measure from the confirmation of a prior output. The exact script and wallet design determine which rule applies.

Recovery and inheritance

A primary key path can coexist with a delayed recovery path. This can support carefully designed inheritance or account recovery arrangements without giving the backup key immediate spending power.

Blocks are not a wall clock

Block intervals vary. A height-based delay is predictable in blocks but only approximate in human time. A time-sensitive plan should include margin for confirmation variance, fee conditions and operational mistakes.

Do not improvise with real funds

Timelocked scripts are unforgiving. Use well-reviewed wallet software, rehearse recovery with test funds, preserve descriptors and backups, and obtain specialist advice for material amounts.

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