{
  "manageEntity": {
    "action": "Save",
    "entityId": "451834677",
    "entityType": "Track",
    "nonce": "0x2a47e0324cf9538c4f788327fc15ed564a0a5b5ccf10dcb61dc9a1acc65b2503",
    "signature": "0xdb79c6b2ccc4a54cb8b28b9a8e07238d1057fef2e7624bff1938bef3984c56a363c48fe35eb8ec9d67cbc4d5423859a9a54f1d57f153bc514d1e69f1c81470ad1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}