{
  "manageEntity": {
    "action": "Save",
    "entityId": "1959815591",
    "entityType": "Track",
    "nonce": "0x7dc61d7cf07a8b95b5fcf85f7da000b8af40563d96c8ff5acae75571a4405ca3",
    "signature": "0xa3f10e493569ac1ab3d2ea9dd4cbf57e04f0b32264127bb87fa38d3f915dd730740a4c0f0b7603e9e520d7931319a3ea70f9ad6be6b6c528cbb9c128369b751e1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}