Finance (Crypto and exchanges), Halving countdown

A coin's halving on a trading terminal: a tag and the headline, the countdown panel with the days, hours and blocks to go set large in a mono face exactly as sent, then the chain panel with the block height, the expected date, up to two stats, a meter of the period and the source and time of the data, then what a halving is and up to three quick lines, then the button and the brand's analyst. The risk warning stays on screen throughout. Ten seconds, and one and a half seconds longer per line.

Template	Finance (Crypto and exchanges), tpl_20eb67de501a
Variant	Halving countdown
Version	1.0.0, the newest: what a channel following this variant draws
Shapes	9x16, 4x5, 1x1, 16x9, 2x3
Length	15 seconds

Example video

The 1x1 cut of this variant, drawn from its own worked example. Open the video on its own.

What it accepts

The next halving of a coin: days, hours and blocks to go exactly as sent (never counted from a clock), the block height, the expected date, a meter of the period, up to two stats, the source and its time, then what a halving is, up to three quick lines, the button and your analyst. The risk warning stays on screen. metaData is never drawn.

Field	Type	Required	Limit	What it is
clipData	group	yes		Clip data: Everything drawn in the clip: the tag, the headline, the countdown, the chain, the note, the call to action and the risk lines.
clipData.tag	text		up to 20 characters	Tag: The kind of post, in the block at the top, such as Halving or Countdown.
clipData.stamp	text		up to 24 characters	Status: A short status beside the light at the top, such as LIVE or a block height.
clipData.headline	text		up to 72 characters	Headline: What the post says, in a few words.
clipData.symbol	text		up to 12 characters	Symbol: The coin's ticker symbol, such as BTC.
clipData.countdownLabel	text	yes	up to 32 characters	Countdown caption: The caption on the countdown panel's header strip, such as Next halving in.
clipData.days	integer	yes	from 0	Days: The days left, exactly as you send them. Never worked out from a clock.
clipData.daysLabel	text	yes	up to 12 characters	Days name: The word under the days, such as Days.
clipData.hours	integer	yes	from 0	Hours: The hours left after the days, exactly as you send them.
clipData.hoursLabel	text	yes	up to 12 characters	Hours name: The word under the hours, such as Hours.
clipData.blocks	integer	yes	from 0	Blocks: The blocks left until the halving, exactly as you send them.
clipData.blocksLabel	text	yes	up to 12 characters	Blocks name: The word under the blocks, such as Blocks.
clipData.chainLabel	text		up to 32 characters	Chain caption: The caption on the chain panel's header strip, such as The chain now.
clipData.blockHeight	integer	yes	from 0	Block height: The height of the newest block when the data was read, exactly as sent.
clipData.blockHeightLabel	text	yes	up to 24 characters	Block height name: The name over the block height, such as Block height.
clipData.expectedDate	text	yes	up to 40 characters	Expected date: When the halving is expected, as you want it written, such as about 17 April 2028.
clipData.expectedLabel	text	yes	up to 24 characters	Expected date name: The name over the expected date, such as Expected.
clipData.epochBlocks	integer		from 0	Blocks in the period: The blocks between one halving and the next. With it, a meter shows how far through the period the chain is, drawn from the blocks left. Leave out for no meter.
clipData.progressLabel	text		up to 32 characters	Meter name: The name over the meter, such as Through this period.
clipData.stats	list		up to 2	Stats: Up to two figures beside the block height, each a short name and its value exactly as you want it shown, such as Block reward now and 3.125 BTC.
clipData.stats[]	group			Stat
clipData.stats[].label	text		up to 24 characters	Name: What the figure is.
clipData.stats[].value	text	yes	up to 24 characters	Value: The figure as it is shown.
clipData.source	text	yes	up to 64 characters	Source of the data: Where the block height and the countdown come from, under the chain panel.
clipData.dataTime	text	yes	up to 32 characters	Time of the data: When the data was read, with its time zone.
clipData.noteLabel	text		up to 32 characters	Note caption: The caption on the note's header strip, such as What a halving is.
clipData.note	text		up to 140 characters	Note: What a halving is, in one or two sentences, in a panel after the countdown.
clipData.details	list		up to 3	Quick lines: Up to three short lines, each on its own beat after the note.
clipData.details[]	text		up to 72 characters	Line
clipData.cta	group			Call to action: The button at the end and the line under it, such as a web address, a handle or a phone number.
clipData.cta.label	text	yes	up to 28 characters	Button: What the button says.
clipData.cta.detail	text		up to 48 characters	Line under it: An address, a handle, an app, a phone number.
clipData.riskWarning	text	yes	up to 400 characters	Risk warning: The risk warning your regulator asks for, shown in the risk panel from the first frame to the last. A long warning is set smaller, never cut.
clipData.notAdvice	text		up to 160 characters	Not advice: A line saying the countdown is information and not advice, under the risk warning. Leave out if you show no price.
clipData.disclaimer	text		up to 160 characters	Small print: Any other line that must be shown, above your brand's footer line.
clipData.look	group			Look: How the clip looks and moves. The same six switches in every format (theme, pace, corners, alignment, logo, logo size). Leave any out for the package's default: the brand's colours, standard pace, square corners, text at the start.
clipData.look.theme	enum		brand, light, dark, bold	Theme: Brand: your brand's own colours and background. Light or dark: a page tinted with your brand colour. Bold: your brand colour as the page.
clipData.look.pace	enum		calm, standard, punchy	Pace: How things arrive: calm fades, a standard rhythm, or punchy slams and hard cuts.
clipData.look.corners	enum		square, soft, round	Corners: The shape of cards, pictures and buttons.
clipData.look.align	enum		start, centre	Text alignment: Where the text lines up.
clipData.look.logo	enum		auto, free	Logo: The style's own: the logo on a small plate so it reads on any page. As it is: the logo whole, with no plate, frame or crop, for a logo made to stand on the page, such as one with a transparent background. As it is, make sure your logo reads on the page of the theme you choose.
clipData.look.logoSize	enum		auto, small, large	Logo size: Standard is the style's own size. Small draws the logo a fifth smaller, with its plate. Large draws it a quarter larger wherever the style has room for it, and at the standard size where it has none.
metaData	group			Meta data: Everything about the post that is never drawn in the clip: its title, its description in four lengths, one per kind of platform, and its hashtags. Reelwire adds the brand's description, link and hashtags after it. Left out, the post text is generated from the clip data.
metaData.title	text		up to 100 characters	Title: Used where the platform has a title of its own: Facebook Feed, LinkedIn, Pinterest and YouTube. Up to 100 characters, which every one of them takes.
metaData.captionTiny	text		up to 200 characters	Tiny description (Pinterest, Threads, X): Up to 200 characters. The brand's description, link and hashtags follow it within the platform's limit.
metaData.captionShort	text		up to 500 characters	Short description (Telegram, Threema, WeChat, WhatsApp): Up to 500 characters. The brand's description, link and hashtags follow it within the platform's limit.
metaData.captionMedium	text		up to 1500 characters	Medium description (Discord, Facebook Reels, Instagram, LinkedIn, Signal, Slack, TikTok): Up to 1500 characters. The brand's description, link and hashtags follow it within the platform's limit.
metaData.captionLong	text		up to 4000 characters	Long description (Facebook Feed, YouTube): Up to 4000 characters. The brand's description, link and hashtags follow it within the platform's limit.
metaData.hashtags	list		up to 15	Hashtags: Written without the #. Up to 15, which every platform takes.
metaData.hashtags[]	text		up to 60 characters	Hashtag

locales carries other languages: under each language code, the parts of clipData and metaData that differ, laid over the default, so a language with no copy still renders.

A picture is always a file from your media library: media:// followed by its id or its name. Anything the table does not list is refused, and so is anything over its limit, with a 400 schema_validation error that names the field.

Ask Reelwire for the whole JSON Schema, the document your content is checked against, without signing in:

curl "https://app.reelwire.io/v1/formats/template/tpl_20eb67de501a?variant=Halving%20countdown&version=1.0.0"

Delivery JSON

Your own system sends this to one of your streams, POST /v1/stream, and every channel listening to that stream draws it with its template. data is the document described above; a stream with an empty field map passes it to the template unchanged. Try it first on POST /v1/stream/validate, which answers the same without publishing anything. Streams and feeds explains the rest, including how to map a document of your own shape instead.

{
  "streamId": "st_your_stream_id",
  "eventId": "01M2SQMKK3G1NVFXV31DCBVB95",
  "occurredAt": "2026-09-23T07:00:00Z",
  "locale": "en",
  "data": {
    "clipData": {
      "tag": "Halving",
      "stamp": "Live",
      "headline": "The next Bitcoin halving is 214 days away",
      "symbol": "BTC",
      "countdownLabel": "Next halving in",
      "days": 214,
      "daysLabel": "Days",
      "hours": 7,
      "hoursLabel": "Hours",
      "blocks": 30812,
      "blocksLabel": "Blocks",
      "chainLabel": "The chain now",
      "blockHeight": 1019188,
      "blockHeightLabel": "Block height",
      "expectedDate": "about 17 April 2028",
      "expectedLabel": "Expected",
      "epochBlocks": 210000,
      "progressLabel": "Through this period",
      "stats": [
        {
          "label": "Reward now",
          "value": "3.125 BTC"
        },
        {
          "label": "Reward after",
          "value": "1.5625 BTC"
        }
      ],
      "source": "Halcyon Exchange node, Bitcoin mainnet",
      "dataTime": "18 Oct 2026, 14:32 UTC",
      "noteLabel": "What a halving is",
      "note": "The reward paid to miners for each block is cut in half, so new bitcoin is issued more slowly",
      "details": [
        "It happens about every 210,000 blocks",
        "The date moves with the pace of new blocks",
        "Dates are estimates until the block is mined"
      ],
      "cta": {
        "label": "See the live countdown",
        "detail": "halcyon.example/halving"
      },
      "riskWarning": "Don't invest unless you're prepared to lose all the money you invest. This is a high-risk investment and you should not expect to be protected if something goes wrong.",
      "notAdvice": "This countdown is information only, not investment advice or a prediction of any price.",
      "disclaimer": "",
      "look": {
        "logo": "auto",
        "pace": "standard",
        "align": "start",
        "theme": "brand",
        "corners": "square",
        "logoSize": "auto"
      }
    },
    "metaData": {
      "title": "Bitcoin halving: 214 days, 7 hours and 30,812 blocks to go",
      "captionTiny": "The next Bitcoin halving is about 214 days away, around 17 April 2028. Crypto is high risk: you could lose all you invest.",
      "captionShort": "214 days, 7 hours and 30,812 blocks to the next Bitcoin halving, expected about 17 April 2028. The chain stands at block 1,019,188. Data from our node, read 18 Oct 2026, 14:32 UTC. Don't invest unless you're prepared to lose all the money you invest.",
      "captionMedium": "214 days, 7 hours and 30,812 blocks to the next Bitcoin halving, expected about 17 April 2028. The chain stands at block 1,019,188, and the block reward falls from 3.125 to 1.5625 BTC when the halving arrives. It happens about every 210,000 blocks, and the date moves with the pace of new blocks. Data from our Bitcoin node, read 18 Oct 2026, 14:32 UTC. Don't invest unless you're prepared to lose all the money you invest. This is a high-risk investment and you should not expect to be protected if something goes wrong.",
      "captionLong": "214 days, 7 hours and 30,812 blocks to the next Bitcoin halving, expected about 17 April 2028. The chain stands at block 1,019,188, in a period of 210,000 blocks. When the halving arrives, the block reward paid to miners falls from 3.125 to 1.5625 BTC, so new bitcoin is issued more slowly. The date is an estimate that moves with the pace of new blocks, and it is only certain once the block is mined. Data from our Bitcoin node, read 18 Oct 2026, 14:32 UTC. This countdown is information only, not investment advice or a prediction of any price. Don't invest unless you're prepared to lose all the money you invest. This is a high-risk investment and you should not expect to be protected if something goes wrong.",
      "hashtags": [
        "bitcoin",
        "halving",
        "btc",
        "crypto",
        "blockchain"
      ]
    }
  }
}

The delivery names no version: which build draws it is the channel's choice, the newest of its variant or the one it is pinned to. eventId is a ULID you make once per event: sending the same one again changes nothing. occurredAt is when the thing happened, not when you sent it. locale is the language of the text in data, and data.locales carries other languages beside it.