{
  "manageEntity": {
    "action": "Save",
    "entityId": "416726375",
    "entityType": "Track",
    "nonce": "0x7af38446c812969aeba93268958041801e01794192df177478616688e0f49555",
    "signature": "0x1d8f9b4870aed21549fb0b250506c3092c9717c61258bdf212e77c2f2456b6484e3a31585025a5cd82e8ac7c01618dc2b5b0d02bb78278eaf6eb75fb54c05b6a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}