{
  "manageEntity": {
    "action": "Save",
    "entityId": "770901",
    "entityType": "Track",
    "nonce": "0x93441d4e5acb3b42611fecf552eb88c4333a5386e172bc9f502ce596b93de894",
    "signature": "0xa0bba3ab647ce20aa81d52555c6f91ec13b324df2b8cc610a982958fac4962f0754e70824dca00ba25fcaca6fa1272981bf5b41fb6b518ff53c0626da6e671741b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}