Proof of work
Mine a NIP-13 nonce so relays that filter spam can prefer your events.
Mining
Your browser does the work when you sign, before the event is sent.
Difficulty
Leading zero bits. Each extra bit doubles the work. 0 skips the group.
Notes, replies and articles20 bits · 1,048,576 hashes
Reactions and reposts16 bits · 65,536 hashes
Everything else12 bits · 4,096 hashes
Time limit
Past this, the event is published without proof of work, so posting never gets stuck.
Give up after20s
Never mined: relay auth, remote signing, Blossom and HTTP auth events, and NIP-59 seals.