{
  "manageEntity": {
    "action": "Save",
    "entityId": "1504402426",
    "entityType": "Track",
    "nonce": "0x54ed7226bec4b1c931f01bf572c470442203e5f038bfad28f41139a64edf23c3",
    "signature": "0x29dd9db7c2335bec6e4e8d996938e4029a36b9f6e8a412385c0969ba4cd3544940be0459bf1912554cc838a950e477c8a8f83ac69ba2f33ad53c22dec06e5d1c1b",
    "signer": "0x102a924C1c076Dcb5816d20E32Dcb6F00e75F2C9",
    "userId": "485987672"
  }
}