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11_3_Using_CSV_in_Scripts.md
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## Understand nSequence
Every input into in a transaction has an `nSequence` (or if you prefer `sequence`) value. It's been a prime tool for Bitcoin expansions as discussed previously in [§5.2: Resending a Transaction with RBF](05_2_Resending_a_Transaction_with_RBF.md) and [§8.1 Sending a Transaction with a Locktime](08_1_Sending_a_Transaction_with_a_Locktime.md), where it was used to signal RBF and `nLockTime`, respectively. However, there's one more use for `nSequence`, described by [BIP 68](https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki): you can use it to create a relative timelock on a transaction.
Every input into a transaction has an `nSequence` (or if you prefer `sequence`) value. It's been a prime tool for Bitcoin expansions as discussed previously in [§5.2: Resending a Transaction with RBF](05_2_Resending_a_Transaction_with_RBF.md) and [§8.1 Sending a Transaction with a Locktime](08_1_Sending_a_Transaction_with_a_Locktime.md), where it was used to signal RBF and `nLockTime`, respectively. However, there's one more use for `nSequence`, described by [BIP 68](https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki): you can use it to create a relative timelock on a transaction.
A relative timelock is a lock that's placed on a specific input of a transaction and that's calculated in relation to the mining date of the UTXO being used in the input. For example, if a UTXO was mined at block #468260 and a transaction was created where the input for that UTXO was given an `nSequence` of 100, then the new transaction could not be mined until at least block #468360.