{
  "manageEntity": {
    "action": "Save",
    "entityId": "637488530",
    "entityType": "Track",
    "nonce": "0x2524efb2e86c85f2683f9c4f4f0e00b7f0064f4479efa33fad31cad4326fa0be",
    "signature": "0x05a877ec0cf08a90bbb3dcd5266a97146bc02c904c2c66de26f032bbd1dc67e50ca1c446ad848ca6ec873561ae1ab1586fb32b85b7a25717343083277439daac1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}