# BLOCKCHAIN_RID_PLACEHOLDER · FT4 Rell API · Chromia Docs (concept)

> val BLOCKCHAIN_ RID_ PLACEHOLDER: text = "{blockchain_ rid}" tag used in auth message construction which will be replaced with blockchain RID

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.auth/-b-l-o-c-k-c-h-a-i-n_-r-i-d_-p-l-a-c-e-h-o-l-d-e-r/

PROPERTY

# BLOCKCHAIN\_RID\_PLACEHOLDER

```signature
val BLOCKCHAIN_RID_PLACEHOLDER: text = "{blockchain_rid}"
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/auth/authentication.rell#lines-36)

tag used in auth message construction which will be replaced with blockchain RID

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.auth/-b-l-o-c-k-c-h-a-i-n_-r-i-d_-p-l-a-c-e-h-o-l-d-e-r.html)Generated API reference, mirrored from the live docs