{
  "manageEntity": {
    "action": "Save",
    "entityId": "156725",
    "entityType": "Track",
    "nonce": "0x613da033c1f9a1caa5b4f399ff8b74fff1d649ba0853605122f1963872cfd23d",
    "signature": "0x14dff0c901f7510f68541333fb06af9d9372eb57738c99569762322d2c1c330e32fbee86f6dbc75ff1560d77bcbed004a88487fc0383ba37f3389394220029e91c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}