---

name: nla-fulfill description: Fulfill an existing NLA escrow and collect tokens. Use when the user wants to submit fulfillment text for an on-chain escrow, check arbitration results, and collect approved funds. Covers the full fulfill-arbitrate-collect lifecycle. metadata: author: arkhai version: "1.0" compatibility: Requires nla CLI installed (npm install -g nla). Requires a funded Ethereum wallet and access to an EVM chain. allowed-tools: Bash(nla:*) Read

Fulfill NLA Escrow

Help the user fulfill an on-chain escrow by submitting text that satisfies the escrow's demand, then collect the tokens if approved.

Step-by-step instructions

1. Understand the escrow

Get the escrow UID from the user, then check what it demands:

nla escrow:status --escrow-uid <uid>

This shows:

• The demand text
• Arbitration model and provider
• Oracle address
• Any existing fulfillments and their arbitration status

2. Craft the fulfillment

Help the user write fulfillment text that satisfies the demand:

• Read the demand carefully
• The fulfillment text is what the AI arbitrator evaluates against the demand
• Be specific and directly address what the demand asks for
• The default arbitration prompt evaluates whether the "fulfillment" satisfies the "demand" and returns true/false

3. Submit the fulfillment

nla escrow:fulfill \
  --escrow-uid <escrow_uid> \
  --fulfillment "<fulfillment text>" \
  --oracle <oracle_address>

This runs a multi-step on-chain commit-reveal flow:

1. Computes a commitment hash
2. Submits the commitment with a bond
3. Waits for next block confirmation
4. Reveals the fulfillment obligation and returns the bond
5. Requests arbitration from the oracle

The command outputs a fulfillment UID - record this for collection.

4. Monitor arbitration

Check if the oracle has made a decision:

nla escrow:status --escrow-uid <escrow_uid>

The oracle typically responds within seconds if it's running. Look for "APPROVED" or "REJECTED" in the output.

5. Collect tokens (if approved)

Once the oracle approves:

nla escrow:collect \
  --escrow-uid <escrow_uid> \
  --fulfillment-uid <fulfillment_uid>

This transfers the escrowed tokens to the fulfiller.

Key details

• The fulfillment text is permanently recorded on-chain
• The commit-reveal process requires gas for multiple transactions
• If rejected, the tokens stay in escrow - another fulfillment attempt can be made by anyone
• The oracle address must match what was specified when the escrow was created (visible in status output)
• Collection only succeeds after the oracle records an approval

Prerequisites

• nla CLI installed and configured
• Private key set via nla wallet:set, --private-key flag, or PRIVATE_KEY env var
• ETH in the fulfiller's account for gas
• The oracle must be running (or use the public demo on Sepolia)

Example full flow

# 1. Check what the escrow demands
nla escrow:status --escrow-uid 0xabc123...

# 2. Submit fulfillment
nla escrow:fulfill \
  --escrow-uid 0xabc123... \
  --fulfillment "The sky appears blue due to Rayleigh scattering" \
  --oracle 0x70997970C51812dc3A010C7d01b50e0d17dc79C8

# 3. Check arbitration result
nla escrow:status --escrow-uid 0xabc123...

# 4. Collect if approved
nla escrow:collect \
  --escrow-uid 0xabc123... \
  --fulfillment-uid 0xdef456...