{
  "manageEntity": {
    "action": "Save",
    "entityId": "619513613",
    "entityType": "Track",
    "nonce": "0x6f310a36c31f135ebaf5f2e5e5cb08cb20efdef49b31f34eb0062798aa2fe8e0",
    "signature": "0x2a759d6d1c474999ad385e66c31ec7fc00940ccf53af1021b3f853a35701e54c11b1a822ef357cce778d92cb0cb0ce354ae76acf51787ac4abf27d947e7f12df1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}