blocklist-tx.js builds the three payloads and a transaction that takes its
inputs from the list address and returns its change there, which is both the
authority proof and the funding of the next entry. blocklist-admin.mjs
publishes a report and chains the flag on its change, so the pair needs no
waiting; it refuses free-text reasons and declines 'stolen' in this phase.
bns.js recognises the opcodes and reduces a list through the shared reducer
rather than a second copy of the rules.
The tests cover the validity rules, the authority rule against a stranger who
only pays the address, ordering inside one block, and the contract that
matters most: no subscription, or a subscription to an empty list, changes
no answer.
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