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Everything in the Singularity Engine is on-chain Anchor state. Understanding the accounts makes the rest of the docs click.

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A “position” = one stake account per role

Each wallet has one position per role — a Program-Derived Address (PDA) seeded by your wallet and the role: 
stake account PDA = ["stake", your_wallet, role]
So a single wallet can hold up to three positions at once — Compute, Validator, and Yield — each tracked independently with its own amount, status, and reward checkpoints.
FieldMeaning
amount$SGL currently staked in this position
statusactive, unstaking, or slashed
staked_atWhen the position was opened
unlock_atAbsolute time you can withdraw (set when you unstake)
reward_per_token_paidYour USDC reward checkpoint
sgl_reward_per_token_paidYour $SGL reward checkpoint
The reward checkpoints are how the engine pays you only for distributions made after you staked — see How Rewards Work.

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The vaults

Staked tokens never sit in a wallet the platform controls. They live in program-owned vaults whose authority is a PDA, so only the program can move them — and only back to you:
VaultHolds
Stake vaultAll staked $SGL principal
Reward vault (USDC)USDC rewards waiting to be claimed
Reward vault ($SGL)$SGL rewards waiting to be claimed
Penalty vaultSlashed $SGL (tamper penalties), pending burn
This separation is what makes staking non-custodial: your principal and the platform’s reward deposits are distinct, and the program only releases principal to the original staker after a cooldown.

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Config

A single StakingConfig account holds the live parameters — minimums, cooldowns, and the authority keys. These are adjustable on-chain (no redeploy), so the network can tune economics over time. The current values are listed on each Staker Type page.