{
  "manageEntity": {
    "action": "Save",
    "entityId": "1553377915",
    "entityType": "Track",
    "nonce": "0x4f684be814c6c5935dbf9a1c967452ccc02c42a5ebdca00af5c6d1cf71ab3530",
    "signature": "0xe454d3a15dc73b7060d9976881334934ecf1cd74a2568090691412b8c6c8492224a8cc8abdb8fa506918cb8b495d29bad0d31f30474f37fa2147741745b1f6511c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}