{
  "manageEntity": {
    "action": "Save",
    "entityId": "1021370687",
    "entityType": "Track",
    "nonce": "0xa844815fb0a545e146cabf400b414f2408310edfa2e5841a7a79f0261c5f6613",
    "signature": "0xb1a154c551ed22293e326ecb0f69ae2b5b3078fbca077e7c79f5fe906ca7301b44f2d5012f9166395975d3e161cb8faa5de449a74b565aac64db400347af90fc1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}