{
  "manageEntity": {
    "action": "Save",
    "entityId": "541253",
    "entityType": "Track",
    "nonce": "0xc0b5ea15d3e7568cf0e94ce7f80a9b015cf0bf566ed352452f4b8ba2fe1bc3be",
    "signature": "0xc58b3d9f20252f77be14443daa743c2f3b12d48b9067e7bff61c81a623ff97954a93523d4213000810cbe1d3b9e0eb8713e00cb827f02b79b61b5e6c1cbf80c91c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}