{
  "manageEntity": {
    "action": "Save",
    "entityId": "50549",
    "entityType": "Track",
    "nonce": "0x4986abf3f78fca1aa931048f610b52f982e59789dec42cc85f34ea9cbace0cbf",
    "signature": "0x94de019ed0820fc1cfe0ec43279c94b4390568db44f1b4a383b5706446cd62d9479001e21dc24ad3aaa6a87d86f857706da6db845f9ce8c6078385d8795d63371c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}