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Design notes and pitfalls

Receiver address types, dust and funding for parallel actions.

Receiver address types#

The indexer stores whatever address an output script decodes to. If a token transfer pays a p2wpkh (bc1q…) address, the balance is stored under that string. The owner can only act as their taproot identity address, so those tokens can never be spent.

Dust#

A program-account output must hold at least 330 sats; the change at output 1 must be at least that.

Funding and parallel actions#

A program account is funded by paying sats to it. Several separate funded outputs let several actions run in parallel without waiting for a confirmation.

Fees#

The miner fee is the fee rate times the transaction's virtual size, so it grows with the number of inputs and payment outputs.

Input amounts#

The signature commits to the amount of every input. Building or signing an action with a wrong input amount produces an invalid signature.