This skill should be used when working with POW20 proof-of-work mineable BSV21 tokens — mining, deploying, building redeem transactions, submitting solutions, fetching token state, calculating difficulty, or building POW20 miners. Triggers on 'POW20', 'proof-of-work token', 'mine tokens', 'hash to mint', 'HashToMint', 'pow20-miner', 'mining difficulty', 'mine BSV21', 'token mining', or 'proof of work BSV'.
From 1satnpx claudepluginhub b-open-io/claude-plugins --plugin 1satThis skill uses the workspace's default tool permissions.
Dispatches parallel agents to independently tackle 2+ tasks like separate test failures or subsystems without shared state or dependencies.
Executes pre-written implementation plans: critically reviews, follows bite-sized steps exactly, runs verifications, tracks progress with checkpoints, uses git worktrees, stops on blockers.
Guides idea refinement into designs: explores context, asks questions one-by-one, proposes approaches, presents sections for approval, writes/review specs before coding.
Proof-of-work mineable BSV21 fungible tokens using sCrypt smart contracts on 1Sat Ordinals. The contract is a recursive covenant that enforces mining rules and token issuance on-chain.
A POW20 token is a stateful sCrypt covenant (HashToMintBsv20 extending BSV20V2 from scrypt-ord). Each mine spends the contract UTXO and creates a new one with reduced supply, plus a reward inscription to the miner.
The mining puzzle is SHA256d:
hash = SHA256(SHA256(outpoint_txid || nonce))
hash must have N leading zero nibbles (original) or bits (Runar variant)
Q=$(echo '{"insc":{"json":{"contract":"pow-20"}}}' | base64)
curl "https://ordinals.gorillapool.io/api/txos/search/unspent?q=${Q}&limit=10"
curl "https://ordinals.gorillapool.io/api/inscriptions/{tokenId}/latest?script=true"
Preimage (64 bytes):
Bytes 0-31: Outpoint txid (32 bytes, byte-reversed)
Bytes 32-39: Nonce counter (uint64, little-endian)
Bytes 40-47: Worker thread ID (uint64, little-endian)
Bytes 48-63: Padding (zeros)
Solution = SHA256(SHA256(preimage))
Valid when: N leading zero nibbles where N = dynamic difficulty
Build redeem transaction and broadcast via Arcade:
POST https://api.1sat.app/1sat/arcade/tx
GET https://ordinals.gorillapool.io/api/txos/search/unspent?q={base64}
query = base64('{"insc":{"json":{"contract":"pow-20"}}}')
GET https://ordinals.gorillapool.io/api/inscriptions/{tokenId}/latest?script=true
GET https://api.1sat.app/1sat/bsv21/{tokenId}
GET https://api.1sat.app/1sat/bsv21/{tokenId}/p2pkh/{address}/balance
POST https://api.1sat.app/1sat/arcade/tx (BEEF transaction)
GET https://api.1sat.app/1sat/sse/{tokenId} (SSE stream)
| Supply Remaining | Extra Difficulty |
|---|---|
| 80-100% | +0 |
| 60-80% | +1 (16x) |
| 40-60% | +2 (256x) |
| 20-40% | +3 (4096x) |
| 0-20% | +4 (65536x) |
difficulty = startingDifficulty + (mined / totalSupply) * difficultyRange
Input 0: Contract UTXO
<rewardPkh> <nonce> <changeAmount> <changePKH> <txPreimage>ANYONECANPAY | ALL | FORKIDOutput 0: Contract continuation (1 sat) — inscription + updated contract script Output 1: Reward to miner (1 sat) — inscription + P2PKH Output 2+: Change P2PKH
Contract verifies hash256(all_outputs) === hashOutputs from BIP-143 preimage.
@bsv/sdk via subprocess| What | Language | URL |
|---|---|---|
| Contract (sCrypt) | TypeScript | https://github.com/danwag06/htm-contract |
| Contract (Runar) | TS/Zig | https://github.com/b-open-io/pow20-runar |
| Miner (Go) | Go | https://github.com/b-open-io/pow20-miner |
| Miner (Zig) | Zig | https://github.com/b-open-io/pow20-miner-zig |
| Protocol | — | https://protocol.pow20.io/ |
1sat:1sat-stack — API endpoints for token state and broadcasting1sat:token-operations — BSV21 token send/receive/balancebsv-skills:smart-contracts — Runar/sCrypt contract developmentbsv-skills:bsv-standards — BSV-21 inscription format details