diff --git a/cid-vs-multihash.js b/cid-vs-multihash.js
new file mode 100644
index 0000000..9139cd9
--- /dev/null
+++ b/cid-vs-multihash.js
@@ -0,0 +1,25 @@
+import { CID } from 'multiformats/cid'
+import * as multihash from 'multiformats/hashes/digest'
+
+/*
+HUMAN READABLE CID
+base32    - cidv1   - raw        - (sha2-256 : 256 : FAE8D07F50DBBCD3FDD65610ADCD6C3DF2171B31AE97041B1E222506E78DFD94)
+MULTIBASE - VERSION - MULTICODEC - MULTIHASH (NAME : SIZE : DIGEST IN HEX)
+*/
+const MY_CID = 'bafkreih25dih6ug3xtj73vswccw423b56ilrwmnos4cbwhrceudopdp5sq'
+console.log('CID string', MY_CID)
+
+// Found via https://cid.contact/cid/bafkreih25dih6ug3xtj73vswccw423b56ilrwmnos4cbwhrceudopdp5sq
+const MULTIHASH = 'EiD66NB/UNu80/3WVhCtzWw98hcbMa6XBBseIiUG5439lA=='
+console.log('IPNI Multihash (base64)', MULTIHASH)
+console.log('IPNI multihash (hex)', Buffer.from(MULTIHASH, 'base64').toString('hex'))
+
+const cid = CID.parse(MY_CID)
+console.log('CID multihash (hex) ', Buffer.from(cid.multihash.bytes).toString('hex'))
+console.log('CID codec', '0x' + cid.code.toString(16))
+
+const cid2 = CID.create(cid.version, 0x70 /* dag-pb */, cid.multihash)
+console.log('dag-pb CID', cid2)
+
+console.log('CID FROM MULTIHASH', CID.create(1, 0x55 /* raw */, multihash.decode(Buffer.from(MULTIHASH, 'base64'))))
+console.log('ORIGINAL CID      ', cid)
diff --git a/package-lock.json b/package-lock.json
index 4d76240..c6a03d4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,13 +1,302 @@
 {
-  "name": "piece-indexer",
+  "name": "@filecoin-station/piece-indexer",
   "version": "0.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "piece-indexer",
+      "name": "@filecoin-station/piece-indexer",
       "version": "0.1.0",
-      "license": "(Apache-2.0 AND MIT)"
+      "license": "(Apache-2.0 AND MIT)",
+      "dependencies": {
+        "@ipld/dag-cbor": "^9.2.1",
+        "@multiformats/multiaddr-to-uri": "^10.1.0",
+        "multiformats": "^13.1.3"
+      }
+    },
+    "node_modules/@chainsafe/is-ip": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@chainsafe/is-ip/-/is-ip-2.0.2.tgz",
+      "integrity": "sha512-ndGqEMG1W5WkGagaqOZHpPU172AGdxr+LD15sv3WIUvT5oCFUrG1Y0CW/v2Egwj4JXEvSibaIIIqImsm98y1nA=="
+    },
+    "node_modules/@chainsafe/netmask": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@chainsafe/netmask/-/netmask-2.0.0.tgz",
+      "integrity": "sha512-I3Z+6SWUoaljh3TBzCnCxjlUyN8tA+NAk5L6m9IxvCf1BENQTePzPMis97CoN/iMW1St3WN+AWCCRp+TTBRiDg==",
+      "dependencies": {
+        "@chainsafe/is-ip": "^2.0.1"
+      }
+    },
+    "node_modules/@ipld/dag-cbor": {
+      "version": "9.2.1",
+      "resolved": "https://registry.npmjs.org/@ipld/dag-cbor/-/dag-cbor-9.2.1.tgz",
+      "integrity": "sha512-nyY48yE7r3dnJVlxrdaimrbloh4RokQaNRdI//btfTkcTEZbpmSrbYcBQ4VKTf8ZxXAOUJy4VsRpkJo+y9RTnA==",
+      "dependencies": {
+        "cborg": "^4.0.0",
+        "multiformats": "^13.1.0"
+      },
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=7.0.0"
+      }
+    },
+    "node_modules/@leichtgewicht/ip-codec": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@leichtgewicht/ip-codec/-/ip-codec-2.0.5.tgz",
+      "integrity": "sha512-Vo+PSpZG2/fmgmiNzYK9qWRh8h/CHrwD0mo1h1DzL4yzHNSfWYujGTYsWGreD000gcgmZ7K4Ys6Tx9TxtsKdDw=="
+    },
+    "node_modules/@libp2p/interface": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/@libp2p/interface/-/interface-1.5.0.tgz",
+      "integrity": "sha512-SivVvZ+7r7Vgnv+Y88nGZTpG449PYZAPgfLhVqTXn6T4NAFt47InzC7UMFnVqSQuT21YmI9DoeaVXH73CsHNrg==",
+      "dependencies": {
+        "@multiformats/multiaddr": "^12.2.3",
+        "it-pushable": "^3.2.3",
+        "it-stream-types": "^2.0.1",
+        "multiformats": "^13.1.0",
+        "progress-events": "^1.0.0",
+        "uint8arraylist": "^2.4.8"
+      }
+    },
+    "node_modules/@multiformats/dns": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/@multiformats/dns/-/dns-1.0.6.tgz",
+      "integrity": "sha512-nt/5UqjMPtyvkG9BQYdJ4GfLK3nMqGpFZOzf4hAmIa0sJh2LlS9YKXZ4FgwBDsaHvzZqR/rUFIywIc7pkHNNuw==",
+      "dependencies": {
+        "@types/dns-packet": "^5.6.5",
+        "buffer": "^6.0.3",
+        "dns-packet": "^5.6.1",
+        "hashlru": "^2.3.0",
+        "p-queue": "^8.0.1",
+        "progress-events": "^1.0.0",
+        "uint8arrays": "^5.0.2"
+      }
+    },
+    "node_modules/@multiformats/multiaddr": {
+      "version": "12.3.0",
+      "resolved": "https://registry.npmjs.org/@multiformats/multiaddr/-/multiaddr-12.3.0.tgz",
+      "integrity": "sha512-JQ8Gc/jgucqqvEaDTFN/AvxlYDHEE7lgEWLMYW7hKZkWggER+GvG/tVxUgUxIP8M0vFpvEHKKHE0lKzyMsgi8Q==",
+      "dependencies": {
+        "@chainsafe/is-ip": "^2.0.1",
+        "@chainsafe/netmask": "^2.0.0",
+        "@libp2p/interface": "^1.0.0",
+        "@multiformats/dns": "^1.0.3",
+        "multiformats": "^13.0.0",
+        "uint8-varint": "^2.0.1",
+        "uint8arrays": "^5.0.0"
+      }
+    },
+    "node_modules/@multiformats/multiaddr-to-uri": {
+      "version": "10.1.0",
+      "resolved": "https://registry.npmjs.org/@multiformats/multiaddr-to-uri/-/multiaddr-to-uri-10.1.0.tgz",
+      "integrity": "sha512-ZNwSAx3ssBWwd4y0LKrOsq9xG7LBHboQxnUdSduNc2fTh/NS1UjA2slgUy6KHxH5k9S2DSus0iU2CoyJyN0/pg==",
+      "dependencies": {
+        "@multiformats/multiaddr": "^12.3.0"
+      }
+    },
+    "node_modules/@types/dns-packet": {
+      "version": "5.6.5",
+      "resolved": "https://registry.npmjs.org/@types/dns-packet/-/dns-packet-5.6.5.tgz",
+      "integrity": "sha512-qXOC7XLOEe43ehtWJCMnQXvgcIpv6rPmQ1jXT98Ad8A3TB1Ue50jsCbSSSyuazScEuZ/Q026vHbrOTVkmwA+7Q==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/node": {
+      "version": "20.14.9",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.14.9.tgz",
+      "integrity": "sha512-06OCtnTXtWOZBJlRApleWndH4JsRVs1pDCc8dLSQp+7PpUpX3ePdHyeNSFTeSe7FtKyQkrlPvHwJOW3SLd8Oyg==",
+      "dependencies": {
+        "undici-types": "~5.26.4"
+      }
+    },
+    "node_modules/base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ]
+    },
+    "node_modules/buffer": {
+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-6.0.3.tgz",
+      "integrity": "sha512-FTiCpNxtwiZZHEZbcbTIcZjERVICn9yq/pDFkTl95/AxzD1naBctN7YO68riM/gLSDY7sdrMby8hofADYuuqOA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.2.1"
+      }
+    },
+    "node_modules/cborg": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/cborg/-/cborg-4.2.2.tgz",
+      "integrity": "sha512-A0z7WhnY4HDLrVdnQI4i/OLG3kANHotk5NzDpr2iauf4xrmQPwJCxlbCnIXkVrFtsr8G3omfvvr5oF50i1Zt8g==",
+      "bin": {
+        "cborg": "lib/bin.js"
+      }
+    },
+    "node_modules/dns-packet": {
+      "version": "5.6.1",
+      "resolved": "https://registry.npmjs.org/dns-packet/-/dns-packet-5.6.1.tgz",
+      "integrity": "sha512-l4gcSouhcgIKRvyy99RNVOgxXiicE+2jZoNmaNmZ6JXiGajBOJAesk1OBlJuM5k2c+eudGdLxDqXuPCKIj6kpw==",
+      "dependencies": {
+        "@leichtgewicht/ip-codec": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/eventemitter3": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-5.0.1.tgz",
+      "integrity": "sha512-GWkBvjiSZK87ELrYOSESUYeVIc9mvLLf/nXalMOS5dYrgZq9o5OVkbZAVM06CVxYsCwH9BDZFPlQTlPA1j4ahA=="
+    },
+    "node_modules/hashlru": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/hashlru/-/hashlru-2.3.0.tgz",
+      "integrity": "sha512-0cMsjjIC8I+D3M44pOQdsy0OHXGLVz6Z0beRuufhKa0KfaD2wGwAev6jILzXsd3/vpnNQJmWyZtIILqM1N+n5A=="
+    },
+    "node_modules/ieee754": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.2.1.tgz",
+      "integrity": "sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ]
+    },
+    "node_modules/it-pushable": {
+      "version": "3.2.3",
+      "resolved": "https://registry.npmjs.org/it-pushable/-/it-pushable-3.2.3.tgz",
+      "integrity": "sha512-gzYnXYK8Y5t5b/BnJUr7glfQLO4U5vyb05gPx/TyTw+4Bv1zM9gFk4YsOrnulWefMewlphCjKkakFvj1y99Tcg==",
+      "dependencies": {
+        "p-defer": "^4.0.0"
+      }
+    },
+    "node_modules/it-stream-types": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/it-stream-types/-/it-stream-types-2.0.1.tgz",
+      "integrity": "sha512-6DmOs5r7ERDbvS4q8yLKENcj6Yecr7QQTqWApbZdfAUTEC947d+PEha7PCqhm//9oxaLYL7TWRekwhoXl2s6fg==",
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=7.0.0"
+      }
+    },
+    "node_modules/multiformats": {
+      "version": "13.1.3",
+      "resolved": "https://registry.npmjs.org/multiformats/-/multiformats-13.1.3.tgz",
+      "integrity": "sha512-CZPi9lFZCM/+7oRolWYsvalsyWQGFo+GpdaTmjxXXomC+nP/W1Rnxb9sUgjvmNmRZ5bOPqRAl4nuK+Ydw/4tGw=="
+    },
+    "node_modules/p-defer": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/p-defer/-/p-defer-4.0.1.tgz",
+      "integrity": "sha512-Mr5KC5efvAK5VUptYEIopP1bakB85k2IWXaRC0rsh1uwn1L6M0LVml8OIQ4Gudg4oyZakf7FmeRLkMMtZW1i5A==",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/p-queue": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/p-queue/-/p-queue-8.0.1.tgz",
+      "integrity": "sha512-NXzu9aQJTAzbBqOt2hwsR63ea7yvxJc0PwN/zobNAudYfb1B7R08SzB4TsLeSbUCuG467NhnoT0oO6w1qRO+BA==",
+      "dependencies": {
+        "eventemitter3": "^5.0.1",
+        "p-timeout": "^6.1.2"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/p-timeout": {
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/p-timeout/-/p-timeout-6.1.2.tgz",
+      "integrity": "sha512-UbD77BuZ9Bc9aABo74gfXhNvzC9Tx7SxtHSh1fxvx3jTLLYvmVhiQZZrJzqqU0jKbN32kb5VOKiLEQI/3bIjgQ==",
+      "engines": {
+        "node": ">=14.16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/progress-events": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/progress-events/-/progress-events-1.0.0.tgz",
+      "integrity": "sha512-zIB6QDrSbPfRg+33FZalluFIowkbV5Xh1xSuetjG+rlC5he6u2dc6VQJ0TbMdlN3R1RHdpOqxEFMKTnQ+itUwA==",
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=7.0.0"
+      }
+    },
+    "node_modules/uint8-varint": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/uint8-varint/-/uint8-varint-2.0.4.tgz",
+      "integrity": "sha512-FwpTa7ZGA/f/EssWAb5/YV6pHgVF1fViKdW8cWaEarjB8t7NyofSWBdOTyFPaGuUG4gx3v1O3PQ8etsiOs3lcw==",
+      "dependencies": {
+        "uint8arraylist": "^2.0.0",
+        "uint8arrays": "^5.0.0"
+      }
+    },
+    "node_modules/uint8arraylist": {
+      "version": "2.4.8",
+      "resolved": "https://registry.npmjs.org/uint8arraylist/-/uint8arraylist-2.4.8.tgz",
+      "integrity": "sha512-vc1PlGOzglLF0eae1M8mLRTBivsvrGsdmJ5RbK3e+QRvRLOZfZhQROTwH/OfyF3+ZVUg9/8hE8bmKP2CvP9quQ==",
+      "dependencies": {
+        "uint8arrays": "^5.0.1"
+      }
+    },
+    "node_modules/uint8arrays": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/uint8arrays/-/uint8arrays-5.1.0.tgz",
+      "integrity": "sha512-vA6nFepEmlSKkMBnLBaUMVvAC4G3CTmO58C12y4sq6WPDOR7mOFYOi7GlrQ4djeSbP6JG9Pv9tJDM97PedRSww==",
+      "dependencies": {
+        "multiformats": "^13.0.0"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "5.26.5",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
+      "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA=="
     }
   }
 }
diff --git a/package.json b/package.json
index 0e9b370..e324438 100644
--- a/package.json
+++ b/package.json
@@ -16,5 +16,10 @@
   "bugs": {
     "url": "https://github.com/filecoin-station/piece-indexer/issues"
   },
-  "homepage": "https://github.com/filecoin-station/piece-indexer#readme"
+  "homepage": "https://github.com/filecoin-station/piece-indexer#readme",
+  "dependencies": {
+    "@ipld/dag-cbor": "^9.2.1",
+    "@multiformats/multiaddr-to-uri": "^10.1.0",
+    "multiformats": "^13.1.3"
+  }
 }
diff --git a/parse-metada.js b/parse-metada.js
new file mode 100644
index 0000000..0013fd1
--- /dev/null
+++ b/parse-metada.js
@@ -0,0 +1,31 @@
+import { varint } from 'multiformats'
+import * as cbor from '@ipld/dag-cbor'
+
+// console.log(parseMetadata(
+//   'kBKjaFBpZWNlQ0lE2CpYKAABgeIDkiAgieDL6/pbxDBAJtdZ19ZsvGh1NE77nBxbFwesoG1S/jJsVmVyaWZpZWREZWFs9W1GYXN0UmV0cmlldmFs9Q'
+// ))
+
+export function parseMetadata (meta) {
+  const bytes = Buffer.from(meta, 'base64')
+  const [protocolCode, nextOffset] = varint.decode(bytes)
+
+  const protocol = {
+    0x900: 'bitswap',
+    0x910: 'graphsync',
+    0x0920: 'http'
+  }[protocolCode] ?? '0x' + protocolCode.toString(16)
+
+  if (protocol === 'graphsync') {
+    // console.log(bytes.subarray(nextOffset).toString('hex'))
+
+    /** @type {{
+    PieceCID: import('multiformats/cid').CID,
+    VerifiedDeal: boolean,
+    FastRetrieval: boolean
+    }} */
+    const deal = cbor.decode(bytes.subarray(nextOffset))
+    return { protocol, deal }
+  } else {
+    return { protocol }
+  }
+}
diff --git a/poc.js b/poc.js
new file mode 100644
index 0000000..896460a
--- /dev/null
+++ b/poc.js
@@ -0,0 +1,104 @@
+import { multiaddrToUri } from '@multiformats/multiaddr-to-uri'
+import { CID } from 'multiformats/cid'
+import * as multihash from 'multiformats/hashes/digest'
+import assert from 'node:assert'
+import { parseMetadata } from './parse-metada.js'
+
+// IPNI specs: https://github.com/ipni/specs
+
+// TODO: list all index providers
+// https://cid.contact/providers
+
+// https://github.com/filecoin-station/frisbii-on-fly
+// This index provider does not set Graphsync metadata
+// const providerPeerId = '12D3KooWHge6fZmx6fMsizP9YYpbJPNZjiWz7Ye1WLCvmj6VTnjq'
+//
+// Doesn't work - cannot fetch Entries CID
+// Error: Cannot GET http://183.60.90.198:3104/ipni/v1/ad/bafkreehdwdcefgh4dqkjv67uzcmw7oje: 500
+// unable to load data for cid
+// const providerPeerId = '12D3KooWFpNqyFpqujkMXeKrbtasvKkbUSL8ipN5vXtNyfVo7n4f'
+
+// This one works:
+const providerPeerId = '12D3KooWDYiKtcxTrjNFtR6UqKRkJpESYHmmFznQAAkDX2ZHQ49t'
+
+// Get the latest announcement
+const res = await fetch(`https://cid.contact/providers/${encodeURIComponent(providerPeerId)}`)
+assert(res.ok)
+
+/** @type {{
+AddrInfo:{ID:string,Addrs:string[]},
+LastAdvertisement:{"/":string},
+LastAdvertisementTime: string,
+Publisher:{ID:string,Addrs:string[]},
+FrozenAt:null
+ * }}
+ */
+const providerMetadata = await res.json()
+
+console.log('Provider metadata:', providerMetadata)
+const providerBaseUrl = multiaddrToUri(providerMetadata.Publisher.Addrs[0], { assumeHttp: false })
+if (!providerBaseUrl.startsWith('http')) {
+  throw new Error(`Unsupported URI scheme: ${providerBaseUrl}`)
+}
+
+// TODO: handle libp2p index providers, e.g.
+// Publisher: {
+//   ID: '12D3KooWCmLYzfYU2fWVnWJDuEkjt7d8pq7PHYAkXoUFVCPogTA9',
+//   Addrs: [ '/ip4/103.9.208.54/tcp/48080' ]
+// }
+
+/** @type {{
+  Addresses: string[],
+  ContextID: { '/': { bytes: string } },,
+  Entries: {
+    '/': string
+  },
+  IsRm: false,
+  Metadata: { '/': { bytes: string } },
+  Provider: string
+  Signature: {
+    '/': {
+      bytes: string
+    }
+  }
+ }} */
+const head = await fetchCid(providerBaseUrl, providerMetadata.LastAdvertisement['/'])
+console.log('HEAD', head)
+
+const entries = await fetchCid(providerBaseUrl, head.Entries['/'])
+// console.log('ENTRIES', entries.Entries)
+
+const entryHash = entries.Entries[0]['/'].bytes
+console.log('FIRST ENTRY:', entryHash)
+const payloadCid = CID.create(1, 0x55 /* raw */, multihash.decode(Buffer.from(entryHash, 'base64')))
+console.log('PAYLOAD CID', payloadCid)
+
+// const provRes = await fetch(`https://cid.contact/cid/${encodeURIComponent(payloadCid)}`)
+// const provBody = await provRes.json()
+// const allProviderResults = provBody.MultihashResults[0].ProviderResults
+// // console.log('filtering Provider.ID === %s && ContextID === %s', providerPeerId,head.ContextID['/'].bytes)
+// const provider =  allProviderResults.find(r => r.Provider.ID === providerPeerId && r.ContextID === head.ContextID['/'].bytes)
+// console.log('Retrieval provider', provider)
+// console.log('You can fetch the block via lassie')
+// console.log('  lassie fetch -o /dev/null -v --dag-scope block --providers %s/p2p/%s %s', provider.Provider.Addrs[0], providerPeerId, payloadCid)
+
+console.log('Metadata bytes', head.Metadata['/'].bytes)
+const meta = parseMetadata(head.Metadata['/'].bytes)
+console.log('Metadata', meta)
+
+if (meta.deal) {
+  console.log('\n=====')
+  console.log('PieceCID  ', meta.deal.PieceCID)
+  console.log('PayloadCID', payloadCid)
+}
+
+async function fetchCid (providerBaseUrl, adCid) {
+  const url = new URL(adCid, new URL('/ipni/v1/ad/_', providerBaseUrl))
+  console.log('fetching %s', url)
+  const res = await fetch(url)
+  console.log('status', res.status)
+  if (!res.ok) {
+    throw new Error(`Cannot GET ${url}: ${res.status}\n${await res.text()}`)
+  }
+  return await res.json()
+}