{
  "manageEntity": {
    "action": "Save",
    "entityId": "749763436",
    "entityType": "Track",
    "nonce": "0x807aa8ff1ad219a27427f7f865e77a5912b6f528133f9159626483a1d3d35430",
    "signature": "0xdf9a39bbde990c12647963e7b1ee0ab64250e90b90f48358dcdfff08c9c44cf6798d2d3e0c313c8b25779045cadd066664057e798acf17aea549bc3d113eb2ce1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}