{
  "manageEntity": {
    "action": "Save",
    "entityId": "529",
    "entityType": "Track",
    "nonce": "0x9aa9aef1b682a5c68e4098d6d5cd30111359ae80a8948ce5e934ffa93832a7a3",
    "signature": "0x9c19dc1e16bbe67ef3cd03bd3e7f34540a358dfb8517e1a0816e509f8f9a2afa05f7444571b830e2e7a7f1a48077704d9bccea64022333417f3947dde085582d1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}