{
  "manageEntity": {
    "action": "Save",
    "entityId": "544487345",
    "entityType": "Track",
    "nonce": "0xae3be07b591336ebdcd8fa3348905ad0140d964059acdd3651d2cf9943759d2c",
    "signature": "0x3e2a34705899b2c2950f5def3b53d10ffc9cf10a87855772786ab3db494db6177e447e3c6b16521109ff88c6969a016864cf569b6900f0cfc8d4e756b61525a01b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}