generated: '2026-07-20'
method: searched
source: http://web.archive.org/web/20090810213933/http://blockchalk.com/developers
docs: http://web.archive.org/web/20090810213933/http://blockchalk.com/developers
name: BlockChalk authentication profile
status: retired
summary: >-
  BlockChalk's published API surface was fully anonymous. The developer page documented three
  read interfaces (XML, JSON, RSS) parameterized only by latitude and longitude, with no
  API key, token, signature or registration step of any kind. Captured live responses from
  /api/v0.6/chalks confirm unauthenticated public reads.
schemes: []
security_requirements:
  global: none
  notes: >-
    OpenAPI security is an empty array in openapi/blockchalk-chalks-openapi.yml, reflecting
    the documented anonymous access model.
registration:
  required: false
  developer_signup: false
  key_provisioning: none
oauth2: false
openid_connect: false
mutual_tls: false
write_access:
  published: false
  notes: >-
    Only read interfaces were ever published. Posting a chalk was done through the BlockChalk
    mobile clients, and no public write API or credential model was documented.
caveats:
  - The service is retired; this profile is historical and not actionable.