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Switch to using latest finalized block as transaction reference block #874

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Merged
jribbink merged 1 commit into from
Jul 18, 2025
Merged

Switch to using latest finalized block as transaction reference block #874

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6 changes: 5 additions & 1 deletion examples/examples.go
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Original file line number Diff line number Diff line change
Expand Up @@ -140,7 +140,11 @@ func RandomAccount(flowClient access.Client) (flow.Address, *flow.AccountKey, cr
}

func GetReferenceBlockId(flowClient access.Client) flow.Identifier {
block, err := flowClient.GetLatestBlock(context.Background(), true)
// We use the latest finalized block as the reference block ID.
// This is the block that has been finalized and is guaranteed to be included in the chain.
// It is the best choice for a reference block ID, as block sealing lags behind finalization
// and using a sealed block may cause the reference to fall outside the expiration window.
block, err := flowClient.GetLatestBlock(context.Background(), false)
Handle(err)

return block.ID
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5 changes: 5 additions & 0 deletions transaction.go
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Expand Up @@ -178,6 +178,11 @@ func (t *Transaction) Argument(i int, options ...jsoncdc.Option) (cadence.Value,
//
// For example, if a transaction references a block with height of X and the network limit is 10,
// a block with height X+10 is the last block that is allowed to include this transaction.
//
// It is recommended to use the latest finalized block as the reference block ID.
// Transaction expiry is determined by the height difference between the reference block
// and the block that includes the transaction. Block sealing lags behind finalization and
// using the latest sealed block may cause the reference to fall outside the expiration window.
func (t *Transaction) SetReferenceBlockID(blockID Identifier) *Transaction {
t.ReferenceBlockID = blockID
return t
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