{
  "manageEntity": {
    "action": "Save",
    "entityId": "820295229",
    "entityType": "Track",
    "nonce": "0x1bf03838544ec996fd62ccea6dbe8997da95fd96db98b3ab7a2c6175b995528d",
    "signature": "0x5898b34a8befbfc6683ce6146734d071f426cc379108eb0d979d2165a8baa10c06103bd7d155afbe80deabfafc5308f45437d0f3055f023f260147e3aef73f4a1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}