{
  "manageEntity": {
    "action": "Save",
    "entityId": "557292",
    "entityType": "Track",
    "nonce": "0xbb364f05d84c38b719e8bc157943704fcb484df24fc4ba3cec31da5aad2ad1bc",
    "signature": "0x653bc940b82364ed62212997ab40fbad7c378cb930a3b745777f0418b8da972b0028fb856771f31be9489af066c13961594dba80755018fd0342d7a073b7b7e41c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}