{
  "manageEntity": {
    "action": "Save",
    "entityId": "1549122045",
    "entityType": "Track",
    "nonce": "0x45af827c0668566b7a57c7c34249f818329c7d0c86bb2a99e05c8cee415d60cd",
    "signature": "0xbb0fa432b6e41d93acd9d1673ea25e7c139777ecfd84cd1e4db08be58e0268fd2142eb43626313a8bfc506eb75104572ea6fc8d3dda34c01c8ab37e76b5cf9221c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}