{
  "manageEntity": {
    "action": "Save",
    "entityId": "643203357",
    "entityType": "Track",
    "nonce": "0x13f363013badb46f1f5600aa1da6727c3099d29eede0487f547a6697a77588d5",
    "signature": "0x34480161f02050dd4f8c177cd71d8a24edd1f729443ffe92b03dbf2ce6bf39c67c5e81f35cbf00fd0d36ddc3c5479777adb3dfd6db8d3034b3d8fc1ba6befd791c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}