W i d

Worker’s global identity

A P K i

The public key of attribute i

A S K i

The secret key of attribute i

U P K z

The public key of anonymous account Z

U S K z

The secret key of anonymous account Z

W S K i , i d , z

The credential key of attribute i for W i d ’s anonymous account Z

P K requester

The public key used by the requester when publishing the task

E n c ( k e y , c o n t e n t )

A function to encrypt content with a public key encryption, for instance, RSA

R s e t account

Revoked anonymous account collection

C T task

Task content ciphertext

P r o o f task

Proof of attribute for the task


The stamp of current blockchain epoch