{
  "manageEntity": {
    "action": "Save",
    "entityId": "1749881103",
    "entityType": "Track",
    "nonce": "0x70c1ff5b79796f5f6db4f8bdfd33e630cd93358d55881274dbe0d41866f34f8e",
    "signature": "0x5516de16f95a3f53f70fbe0d44cddee6b5cb96caab8231edb92bc4dd3ca251aa5179d3b3123271371f0b11e937567eeb49eb3f658e211ed0a481a351b998a1711b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}