{
  "manageEntity": {
    "action": "Save",
    "entityId": "440841259",
    "entityType": "Track",
    "nonce": "0xc8dd701495667aa719787c1775054648bdabcc3ac30e4725b6eaf64a95322241",
    "signature": "0x5ba78d0b1ea53389211b792769f12e7efbb23f48666a2ddad4dd5bf305a2596655f5121c31a3a2a28c082f231cd413c485ff5914f3ac72f90f1e92f1cf1d09371c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}