{
  "manageEntity": {
    "action": "Save",
    "entityId": "463421",
    "entityType": "Track",
    "nonce": "0x70183f9635fc21d044ac5be5226042538515f4880b498c2290e51a125dc8e3bd",
    "signature": "0x74b82a8b5781f89a52a8d5fdcdd9d576fa5e819c1cc0dc282270587b916cfecf604f29a1778a78240c13ff3ab071ccf48b82bce73e9e88d63743a9042f0bd3221c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}