{
  "manageEntity": {
    "action": "Save",
    "entityId": "541381766",
    "entityType": "Track",
    "nonce": "0x9fab2f07457ca8f784cdd04f1631da0aa6f97a0860ccfd3d6638efa07841ad40",
    "signature": "0x95485d25f46ae8784c7123ff53f5fb008ee612a54fb5d057e1ff607033750ca52da50b0ab7d605a27d5221bd644ce2ed9aebb266c7b0f98f0276696e266ce1b71c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}