{
  "manageEntity": {
    "action": "Save",
    "entityId": "566860244",
    "entityType": "Track",
    "nonce": "0x3eaf0e4e90ef8305e610d17cc85f97ac470d667f396815b942b0a7f1e2461bc8",
    "signature": "0xd428c5efef2b3a0ec3dd8055d941a97ec48fd8450ab6cffe59eeea5fe06123a17b0c00823bd1c53cfd352c7ce3d9b6332b96cab12a9f29403c8debdd2779d9fb1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}