Global Events Writer Block

Publishes document references to one or more global Hedera topics.

• Publishes reference/metadata only (does not create, update, or re-anchor the document).

• Can publish to multiple global topics.

• Publishes each time the block is executed in the policy flow.

• Lets you control publishing per topic/stream in the Writer UI:

• Active ON/OFF — ON = publish, OFF = skip.

• Hidden (optional) — stays in configuration but is hidden in UI.

• Document Type — set per-topic type (vc/json/csv/text/any).

1.1 Properties

Property Name	Description	Example
Default Active(in the block Meta Data)	controls the visibility in the runtime UI	Checked/Unchecked
Show Next button	enable to use this block inside a Step container	Checked/Unchecked
Global topics	the list of default topicIds that Admin adds to the block configuration	0.0.7559767
Active by default	controls the visibility	Checked/Unchecked
Document type	which documentType the Writer writes into the event message for this topic (VC / JSON / CSV / TEXT / ANY)	VC

1.2 API

• Uses the standard policy blocks API (setData), same as other blocks.

• Reader/Writer don’t introduce a new API — they only define their own payload format and supported operation values.

Writer payload (Update streams):
{
  "operation": "Update",
  "streams": [
    { "topicId": "0.0.45345345", "documentType": "vc", "active": true }
  ]
}