10 files changed, 394 insertions, 0 deletions

diff --git a/reveal/v5-000020/check.py b/reveal/v5-000020/check.py
new file mode 100644
index 0000000..7f86b8d
--- /dev/null
+++ b/reveal/v5-000020/check.py
@@ -0,0 +1,319 @@
+#!/usr/bin/env python3
+"""
+Check Echo's self-revealing ledger seals (`sha256-live-v5`) without trusting Echo.
+
+    python3 check.py SEAL_DIR [SEAL_DIR ...] [--tle PATH] [--offline]
+
+Needs Python 3.11+, the `cryptography` package (ChaCha20-Poly1305) and drand's `tle` binary
+(`go install github.com/drand/tlock/cmd/tle@v1.2.0`). It imports nothing of Echo's: a checker that needs the thing it
+checks is not a checker, which is why it is copied, whole, into every seal directory.
+
+Each SEAL_DIR is one seal: `manifest.txt` (the exact text the seal's digest is the sha256 of), `seal.json`, and per
+reveal group `r<ROUND>.tlock` (the group's key, time-locked to that drand round) and `r<ROUND>.ct` (the group,
+encrypted under that key), and, once the group has been revealed, `r<ROUND>.held.json` (how many of its withheld
+lines Echo publishes no salt for, and why) and any number of `r<ROUND>.salts.<N>.json`: each the salts of withheld
+lines Echo decided to open and had not erased, each with its line. `manifest.txt.ots`, when present, is an
+OpenTimestamps proof over the manifest: `ots verify manifest.txt.ots` checks it against Bitcoin.
+
+What it checks, from the files alone and the beacon:
+  1. the manifest hashes to the seal's digest, and each seal names the one before it (when several are given);
+  2. each group's ciphertext and locked key hash to what the manifest commits, and the key is locked to the
+     manifest's round of the manifest's chain;
+  3. for every group whose round the beacon has signed: the round's signature as each relay serves it, the key
+     unlocked with it, the group decrypted, its bytes hashed to the committed digest, its lines and withheld lines
+     counted against the committed counts, its lines in id order, and every line's reveal day recomputed from its
+     own settling instant under the seal's named rule (`utc-day-after-close`: the first 00:00 UTC after
+     `settles_at`, else after the deadline);
+  4. for every opened group with releases: each names this seal, round and group and its own number; each released
+     salt and line hash to the withheld line's committed hash; no line is settled twice; and a hold, where there is
+     one, names the group and counts no more lines than are withheld;
+  5. once every group of every seal from the first is open and every withheld line released: the union of their v4
+     lines, sorted by id, rehashes to the v4 digest the last seal follows, so no sealed forecast was left out of a
+     reveal. Where a withheld line has no released salt (held, erased, or not yet released) that digest cannot be
+     rebuilt, and this says so and why: what is checked then is only that every forecast the v4 seal covers is in a
+     group, counted. A withheld line is never called verified.
+
+A group whose round is not yet signed, or whose withheld lines have no release yet, is reported as pending or held,
+not as a failure. Exit 0 when everything checkable passed, 1 when anything did not match.
+"""
+from __future__ import annotations
+
+import argparse
+import base64
+import hashlib
+import json
+import re
+import subprocess
+import sys
+import urllib.request
+import zlib
+from datetime import datetime, timedelta, timezone
+from pathlib import Path
+
+
+def sha(b: bytes) -> str:
+    return hashlib.sha256(b).hexdigest()
+
+
+def parse_manifest(text: str) -> dict:
+    lines = text.split("\n")
+    if lines[0] != "sha256-live-v5":
+        raise ValueError(f"not a v5 manifest: {lines[0]!r}")
+    m = {"groups": []}
+    for ln in lines[1:]:
+        word, _, rest = ln.partition(" ")
+        if word == "prev":
+            m["prev"] = None if rest == "-" else rest
+        elif word == "follows":
+            seq, digest, n = rest.split(" ")
+            m["follows"] = {"seq": int(seq), "digest": digest, "n": int(n)}
+        elif word == "covers":
+            m["covers"] = rest.split(" ")
+        elif word == "variant":
+            m["variant"] = json.loads(rest)
+        elif word == "counts":
+            m["n"], m["n_withheld"], m["n_groups"] = map(int, rest.split(" "))
+        elif word == "group":
+            r, at, n, w, digest, ct, key, late = rest.split(" ")
+            m["groups"].append({"round": int(r), "reveal_at": at, "n": int(n), "n_withheld": int(w),
+                                "digest": digest, "ct": ct, "key": key, "late": late == "1"})
+        else:
+            raise ValueError(f"unknown manifest line {ln!r}")
+    return m
+
+
+def stanza(locked: str) -> tuple[int, str] | None:
+    body = "".join(ln for ln in locked.strip().splitlines() if not ln.startswith("-----"))
+    m = re.search(rb"-> tlock (\d+) ([0-9a-f]{64})", base64.b64decode(body))
+    return (int(m.group(1)), m.group(2).decode()) if m else None
+
+
+def round_at(beacon: dict, at: datetime) -> int:
+    t = at.timestamp()
+    whole = int(t) + (t != int(t))
+    if whole <= beacon["genesis_time"]:
+        return 1
+    return -(-(whole - beacon["genesis_time"]) // beacon["period"]) + 1
+
+
+def reveal_day(closes: datetime) -> datetime:
+    d = closes.astimezone(timezone.utc).date() + timedelta(days=1)
+    return datetime(d.year, d.month, d.day, tzinfo=timezone.utc)
+
+
+def parse_line(ln: str) -> dict:
+    """One line: `id|issued_at|deadline|forecaster|p|settlement|anchor<TAB>open:<v4>` or `...<TAB>withheld:<hex>`."""
+    numeric, tab, text = ln.partition("\t")
+    if not tab:
+        raise ValueError("a line without its text layer")
+    fid, issued, deadline, forecaster, p, rest = numeric.split("|", 5)
+    dec = json.JSONDecoder()
+    settle, end = dec.raw_decode(rest)
+    if rest[end] != "|":
+        raise ValueError("settlement not followed by the anchor")
+    anchor, end2 = dec.raw_decode(rest, end + 1)
+    if end2 != len(rest):
+        raise ValueError("trailing bytes after the anchor")
+    out = {"id": int(fid), "issued_at": issued, "deadline": deadline, "forecaster": forecaster, "p": float(p),
+           "settlement": settle, "anchor": anchor}
+    if text.startswith("open:"):
+        out["v4"] = text[5:]
+        if not out["v4"].startswith(f"{fid}|"):
+            raise ValueError("the text layer is another forecast's line")
+    elif re.fullmatch(r"withheld:[0-9a-f]{64}", text):
+        out["withheld"] = text[9:]
+    else:
+        raise ValueError(f"unknown text layer {text[:20]!r}")
+    return out
+
+
+def beacon_round(beacon: dict, rnd: int) -> dict:
+    """What each relay serves for the round: its signature, or why there is none."""
+    out = {}
+    for relay in beacon["relays"]:
+        url = f"{relay.rstrip('/')}/{beacon['chain_hash']}/public/{rnd}"
+        try:
+            with urllib.request.urlopen(url, timeout=20) as r:                 # noqa: S310 — the seal's own relays
+                out[relay] = json.loads(r.read()).get("signature")
+        except Exception as exc:                                               # noqa: BLE001 — report, go on
+            out[relay] = f"unavailable ({type(exc).__name__})"
+    return out
+
+
+def unlock(tle: str, beacon: dict, locked: str) -> bytes | None:
+    """The key, or None while the round is unsigned. Each relay is tried in turn."""
+    errors = []
+    for relay in beacon["relays"]:
+        r = subprocess.run([tle, "-d", "-n", relay.rstrip("/") + "/", "-c", beacon["chain_hash"]],
+                           input=locked.encode(), capture_output=True, timeout=120, check=False)
+        if r.returncode == 0:
+            return r.stdout
+        if b"too early" in r.stderr:
+            return None
+        errors.append(f"{relay}: {r.stderr.decode(errors='replace').strip()[-160:]}")
+    raise RuntimeError("; ".join(errors))
+
+
+def release(d: Path, seal_digest: str, g: dict, lines: list[dict], say) -> tuple[dict[int, str], int, str | None]:
+    """An opened group's releases and hold, checked against the group: (id -> the v4 line each released salt opens,
+    how many withheld lines were opened and found erased, and the hold's reason where Echo published one)."""
+    r = g["round"]
+    shut = {x["id"]: x["withheld"] for x in lines if "withheld" in x}
+    out, erased, seen, bad = {}, set(), set(), []
+    files = sorted(d.glob(f"r{r}.salts.*.json"), key=lambda p: int(p.name.split(".")[-2]))
+    for k, path in enumerate(files):
+        rel = json.loads(path.read_text())
+        say(rel.get("format") == "echo-reveal-salts/1" and rel.get("seal") == seal_digest
+            and rel.get("round") == r and rel.get("group") == g["digest"] and rel.get("n") == k
+            and path.name == f"r{r}.salts.{k}.json",
+            f"round {r}: release {k} names this seal, round and group, and follows the one before")
+        for x in rel.get("released", []):
+            i, line = x["id"], x["line"]
+            opens = (i in shut and i not in seen and line.startswith(f"{i}|")
+                     and sha(bytes.fromhex(x["salt"]) + line.encode()) == shut[i])
+            if opens:
+                out[i] = line
+            else:
+                bad.append(i)
+            seen.add(i)
+        for i in rel.get("erased", []):
+            if i not in shut or i in seen:
+                bad.append(i)
+            erased.add(i)
+            seen.add(i)
+    if files:
+        say(not bad, f"round {r}: {len(out)} released lines open their committed hashes, {len(erased)} opened lines "
+                     f"found erased, none settled twice" + (f" ({len(bad)} do not, e.g. {bad[:3]})" if bad else ""))
+    why = None
+    hold = d / f"r{r}.held.json"
+    if hold.exists():
+        h = json.loads(hold.read_text())
+        say(h.get("format") == "echo-reveal-held/1" and h.get("seal") == seal_digest and h.get("round") == r
+            and h.get("group") == g["digest"] and 0 <= h.get("held", -1) <= len(shut),
+            f"round {r}: the hold names this seal, round and group, and counts at most its withheld lines")
+        why = str(h.get("why") or "no reason given")
+    left = len(shut) - len(out) - len(erased)
+    if left:
+        print(f"  ....  round {r}: {left} withheld lines have no released salt: counted, not rehashed"
+              + (f" (Echo publishes none: {why})" if why else " (no release or hold published yet)"))
+    return out, len(erased), why
+
+
+def check(dirs: list[Path], tle: str = "tle", offline: bool = False) -> int:
+    from cryptography.hazmat.primitives.ciphers.aead import ChaCha20Poly1305
+
+    failed, pending, withheld, held, erased, union = 0, 0, 0, 0, 0, {}
+    reasons: set[str] = set()
+    first_prev = "unset"
+
+    def say(ok: bool, what: str) -> None:
+        nonlocal failed
+        failed += not ok
+        print(f"  {'PASS' if ok else 'FAIL'}  {what}")
+
+    prev_digest = None
+    seals = []
+    for d in dirs:
+        text = (d / "manifest.txt").read_bytes()
+        row = json.loads((d / "seal.json").read_text())
+        seals.append((d, text, row, parse_manifest(text.decode())))
+    seals.sort(key=lambda s: s[2]["seq"])
+    last = None
+    for i, (d, text, row, m) in enumerate(seals):
+        print(f"v5 seal {row['seq']}: {m['n']} forecasts in {m['n_groups']} reveal groups, {m['n_withheld']} withheld, "
+              f"follows v4 seal {m['follows']['seq']}")
+        say(sha(text) == row["digest"], f"sha256(manifest.txt) is the seal's digest {row['digest'][:16]}…")
+        say(len(m["groups"]) == m["n_groups"] and sum(g["n"] for g in m["groups"]) == m["n"]
+            and sum(g["n_withheld"] for g in m["groups"]) == m["n_withheld"], "the manifest's counts add up")
+        if i == 0:
+            first_prev = m["prev"]
+        else:
+            say(m["prev"] == prev_digest, "it names the seal before it")
+        prev_digest, last = row["digest"], m
+        b = m["variant"]["beacon"]
+        for g in m["groups"]:
+            r = g["round"]
+            ct, locked = (d / f"r{r}.ct").read_bytes(), (d / f"r{r}.tlock").read_text()
+            say(sha(ct) == g["ct"] and sha(locked.encode()) == g["key"],
+                f"round {r}: the ciphertext and the locked key are the committed ones")
+            say(stanza(locked) == (r, b["chain_hash"]), f"round {r}: the key is locked to that round of that chain")
+            say(round_at(b, datetime.fromisoformat(g["reveal_at"])) == r, f"round {r} is signed at {g['reveal_at']}")
+            if not offline:
+                sigs = beacon_round(b, r)
+                good = {s for s in sigs.values() if s and not s.startswith("unavailable")}
+                print(f"  ....  round {r} signature from {len(sigs)} relays: "
+                      + ("not yet signed" if not good else f"{len(good)} distinct: {min(good)[:24]}…"))
+                if len(good) > 1:
+                    say(False, f"round {r}: relays disagree on its signature")
+            key = unlock(tle, b, locked)
+            if key is None:
+                pending += 1
+                print(f"  ....  round {r} ({g['reveal_at']}) not yet signed: {g['n']} forecasts stay locked")
+                continue
+            try:
+                plain = zlib.decompress(ChaCha20Poly1305(key).decrypt(b"\x00" * 12, ct, None))
+            except Exception as exc:                                       # noqa: BLE001 — a finding, not a crash
+                say(False, f"round {r}: the ciphertext does not open under its key ({type(exc).__name__})")
+                continue
+            say(sha(plain) == g["digest"], f"round {r}: the opened group hashes to its committed digest")
+            lines = [parse_line(ln) for ln in plain.decode().split("\n")]
+            ids = [x["id"] for x in lines]
+            say(len(lines) == g["n"] and sum("withheld" in x for x in lines) == g["n_withheld"],
+                f"round {r}: {len(lines)} lines, {g['n_withheld']} withheld, as committed")
+            say(ids == sorted(set(ids)), f"round {r}: lines in id order, none twice")
+            due = datetime.fromisoformat(g["reveal_at"])
+            if m["variant"].get("reveal") == "utc-day-after-close":
+                wrong = [x["id"] for x in lines if reveal_day(datetime.fromisoformat(
+                    (x["settlement"] or {}).get("settles_at") or x["deadline"])) != due]
+                say(not wrong, f"round {r}: every line belongs to this reveal day"
+                    + (f" ({len(wrong)} do not, e.g. {wrong[:3]})" if wrong else ""))
+            else:
+                print(f"  ....  round {r}: reveal rule {m['variant'].get('reveal')!r} is not one this checker "
+                      "recomputes; which lines belong to the day is unchecked")
+            opened, gone, why = release(d, row["digest"], g, lines, say)
+            for x in lines:
+                if x["id"] in union:
+                    say(False, f"forecast {x['id']} is in two groups")
+                union[x["id"]] = x.get("v4") or opened.get(x["id"])
+            shut = sum(1 for x in lines if "withheld" in x and x["id"] not in opened) - gone
+            erased += gone
+            if why is None:
+                withheld += shut
+            else:
+                held += shut
+                reasons.add(why)
+    if last is not None:
+        if first_prev is not None:
+            print("  ....  completeness: the first seal given is not the chain's first; give every seal from it")
+        elif pending:
+            print(f"  ....  completeness: {pending} groups still locked; it is checkable once all have opened")
+        elif withheld or held or erased:
+            told = [f"{withheld} withheld lines not yet released"] if withheld else []
+            told += ([f"{held} withheld lines held, for which Echo publishes no salt ({'; '.join(sorted(reasons))})"]
+                     if held else [])
+            told += [f"{erased} erased stay hashes"] if erased else []
+            print(f"  ....  completeness: {', '.join(told)}: those lines can be counted but not rehashed, so the v4 "
+                  f"lines cannot all be rebuilt and the v4 digest is NOT checked; {len(union)} forecasts against "
+                  f"the v4 seal's {last['follows']['n']}")
+            say(len(union) == last["follows"]["n"], "every forecast the v4 seal covers is in a group, counted")
+        else:
+            got = sha("\n".join(union[k] for k in sorted(union)).encode())
+            say(got == last["follows"]["digest"] and len(union) == last["follows"]["n"],
+                f"the union of {len(union)} lines rehashes to v4 seal {last['follows']['seq']}'s digest")
+    print("\nNOT VERIFIED" if failed else f"\nVERIFIED{f' ({pending} groups not yet revealed)' if pending else ''}")
+    return 1 if failed else 0
+
+
+def main(argv: list[str]) -> int:
+    ap = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
+    ap.add_argument("dirs", nargs="*", default=[str(Path(__file__).resolve().parent)],
+                    help="seal directories, any order (default: the one this script sits in)")
+    ap.add_argument("--tle", default="tle", help="the tle binary that unlocks a key once its round is signed")
+    ap.add_argument("--offline", action="store_true",
+                    help="do not fetch each round's signature from the relays for display; tle still asks them")
+    args = ap.parse_args(argv)
+    return check([Path(d) for d in args.dirs], tle=args.tle, offline=args.offline)
+
+
+if __name__ == "__main__":
+    raise SystemExit(main(sys.argv[1:]))
diff --git a/reveal/v5-000020/manifest.txt b/reveal/v5-000020/manifest.txt
new file mode 100644
index 0000000..c806dba
--- /dev/null
+++ b/reveal/v5-000020/manifest.txt
@@ -0,0 +1,8 @@
+sha256-live-v5
+prev a7ab9272e99dc1db9d7c77ca7e64abc897956f073c233684fa38e6e2f318e0ae
+follows 50 50af49049c0fea7de52dff1ecf0c0df1c21dd75a67f5ddc29f9a63e1d8026cc8 55692
+covers 2026-10-10T22:11:01.319650Z 2026-10-10T23:12:20.583026Z
+variant {"beacon":{"chain_hash":"52db9ba70e0cc0f6eaf7803dd07447a1f5477735fd3f661792ba94600c84e971","genesis_time":1692803367,"period":3,"relays":["https://api.drand.sh","https://api2.drand.sh","https://api3.drand.sh","https://drand.cloudflare.com"],"scheme":"bls-unchained-g1-rfc9380"},"cipher":"chacha20poly1305-zlib6-nonce0","gate":{"default":"withheld: a kept salt can be released later; an opened text can never be withdrawn","opened":"none","why":"no decision by Echo yet"},"line":"numeric<TAB>open:<v4 line> | numeric<TAB>withheld:sha256(salt||v4 line)","reveal":"utc-day-after-close","salts":"key ring: one content a seal, one part a line","tool":{"name":"tle","sha256":"69157d8c14a1d390d1b7744946288f83d4b10748471d5447f9abb77a5902c541","version":"tlock v1.2.0 -- github.com/drand/tlock"}}
+counts 24 24 2
+group 33562612 2026-11-01T00:00:00.000000Z 12 12 fd39552154d93dbdc3ccd036fd4d625e9541eb1da38b1b1bff331d5654207720 e17ef2e016da692184a40730bacfa5a3fa362cc5f937d795a8d8b0133abbc27f 3f50459f50c86306ed98202291a10fc746be86827294f191d83100dfddc5928b 0
+group 34714612 2026-12-11T00:00:00.000000Z 12 12 c4131191973a18eb4aa602b4096adbf57600f5932ecf3ed5b13baa2f98a830e5 cacb9c9e0091972bdd5bb16f7cd19b6801e0e17a3aed605eed0b73e0cc26ea9a ef9fda02703fb301ec3c17a1587fba82565e9ada3074c5e502bc2cdff1ee1a03 0
\ No newline at end of file
diff --git a/reveal/v5-000020/manifest.txt.ots b/reveal/v5-000020/manifest.txt.ots
new file mode 100644
index 0000000..715120a
--- /dev/null
+++ b/reveal/v5-000020/manifest.txt.ots
diff --git a/reveal/v5-000020/r33562612.ct b/reveal/v5-000020/r33562612.ct
new file mode 100644
index 0000000..7f7dfac
--- /dev/null
+++ b/reveal/v5-000020/r33562612.ct
diff --git a/reveal/v5-000020/r33562612.nostr.json b/reveal/v5-000020/r33562612.nostr.json
new file mode 100644
index 0000000..d0ecfe4
--- /dev/null
+++ b/reveal/v5-000020/r33562612.nostr.json
@@ -0,0 +1 @@
+{"content":"-----BEGIN AGE ENCRYPTED FILE-----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\nWQY8BYLgwg==\n-----END AGE ENCRYPTED FILE-----\n","tags":[["t","echo-ledger-reveal"],["round","33562612"],["reveal_at","2026-11-01T00:00:00.000000Z"],["chain","52db9ba70e0cc0f6eaf7803dd07447a1f5477735fd3f661792ba94600c84e971"],["digest","fd39552154d93dbdc3ccd036fd4d625e9541eb1da38b1b1bff331d5654207720"],["ct","e17ef2e016da692184a40730bacfa5a3fa362cc5f937d795a8d8b0133abbc27f"],["seal","b4e16362e652726ac09a3e88fc4b276dbfc6dd59c57501ec2219f461d390180a"]]}
diff --git a/reveal/v5-000020/r33562612.tlock b/reveal/v5-000020/r33562612.tlock
new file mode 100644
index 0000000..e5c95c9
--- /dev/null
+++ b/reveal/v5-000020/r33562612.tlock
@@ -0,0 +1,11 @@
+-----BEGIN AGE ENCRYPTED FILE-----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+-----END AGE ENCRYPTED FILE-----
diff --git a/reveal/v5-000020/r34714612.ct b/reveal/v5-000020/r34714612.ct
new file mode 100644
index 0000000..6a714a6
--- /dev/null
+++ b/reveal/v5-000020/r34714612.ct
diff --git a/reveal/v5-000020/r34714612.nostr.json b/reveal/v5-000020/r34714612.nostr.json
new file mode 100644
index 0000000..8aed880
--- /dev/null
+++ b/reveal/v5-000020/r34714612.nostr.json
@@ -0,0 +1 @@
+{"content":"-----BEGIN AGE ENCRYPTED FILE-----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\nFvZcgGKwcw==\n-----END AGE ENCRYPTED FILE-----\n","tags":[["t","echo-ledger-reveal"],["round","34714612"],["reveal_at","2026-12-11T00:00:00.000000Z"],["chain","52db9ba70e0cc0f6eaf7803dd07447a1f5477735fd3f661792ba94600c84e971"],["digest","c4131191973a18eb4aa602b4096adbf57600f5932ecf3ed5b13baa2f98a830e5"],["ct","cacb9c9e0091972bdd5bb16f7cd19b6801e0e17a3aed605eed0b73e0cc26ea9a"],["seal","b4e16362e652726ac09a3e88fc4b276dbfc6dd59c57501ec2219f461d390180a"]]}
diff --git a/reveal/v5-000020/r34714612.tlock b/reveal/v5-000020/r34714612.tlock
new file mode 100644
index 0000000..ee2d8a1
--- /dev/null
+++ b/reveal/v5-000020/r34714612.tlock
@@ -0,0 +1,11 @@
+-----BEGIN AGE ENCRYPTED FILE-----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+-----END AGE ENCRYPTED FILE-----
diff --git a/reveal/v5-000020/seal.json b/reveal/v5-000020/seal.json
new file mode 100644
index 0000000..895eeba
--- /dev/null
+++ b/reveal/v5-000020/seal.json
@@ -0,0 +1,43 @@
+{
+  "algorithm": "sha256-live-v5",
+  "anchor_ref": "sha256:b4e16362e652726ac09a3e88fc4b276dbfc6dd59c57501ec2219f461d390180a",
+  "covers_after": "2026-10-10T22:11:01.319650Z",
+  "covers_through": "2026-10-10T23:12:20.583026Z",
+  "digest": "b4e16362e652726ac09a3e88fc4b276dbfc6dd59c57501ec2219f461d390180a",
+  "follows_seq": 50,
+  "n_forecasts": 24,
+  "n_groups": 2,
+  "n_withheld": 24,
+  "prev_digest": "a7ab9272e99dc1db9d7c77ca7e64abc897956f073c233684fa38e6e2f318e0ae",
+  "prev_seq": 19,
+  "sealed_at": "2026-10-10T23:12:39.441170Z",
+  "seq": 20,
+  "variant": {
+    "beacon": {
+      "chain_hash": "52db9ba70e0cc0f6eaf7803dd07447a1f5477735fd3f661792ba94600c84e971",
+      "genesis_time": 1692803367,
+      "period": 3,
+      "relays": [
+        "https://api.drand.sh",
+        "https://api2.drand.sh",
+        "https://api3.drand.sh",
+        "https://drand.cloudflare.com"
+      ],
+      "scheme": "bls-unchained-g1-rfc9380"
+    },
+    "cipher": "chacha20poly1305-zlib6-nonce0",
+    "gate": {
+      "default": "withheld: a kept salt can be released later; an opened text can never be withdrawn",
+      "opened": "none",
+      "why": "no decision by Echo yet"
+    },
+    "line": "numeric<TAB>open:<v4 line> | numeric<TAB>withheld:sha256(salt||v4 line)",
+    "reveal": "utc-day-after-close",
+    "salts": "key ring: one content a seal, one part a line",
+    "tool": {
+      "name": "tle",
+      "sha256": "69157d8c14a1d390d1b7744946288f83d4b10748471d5447f9abb77a5902c541",
+      "version": "tlock v1.2.0 -- github.com/drand/tlock"
+    }
+  }
+}