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13 lines
533 B
Markdown
13 lines
533 B
Markdown
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---
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{{% added-in v=4 %}} The event ID is the [reference
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hash](/server-server-api#calculating-the-reference-hash-for-an-event) of
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the event encoded using a variation of [Unpadded
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Base64](/appendices#unpadded-base64) which replaces the 62nd and
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63rd characters with `-` and `_` instead of using `+` and `/`. This
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matches [RFC4648's definition of URL-safe
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base64](https://tools.ietf.org/html/rfc4648#section-5).
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Event IDs are still prefixed with `$` and might result in looking like
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`$Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Zg`.
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