{
  "manageEntity": {
    "action": "Save",
    "entityId": "1402319391",
    "entityType": "Track",
    "nonce": "0x49f05caedae3e0e30bf107405aef841290e221f46c0a76d755e79c837c5b4768",
    "signature": "0x91af6961e69723a634cf97c0a79a715cf246a6de0759d6aafb8ef09f4988555876c2dfb76da851d599724fe15a0d73d020a9a8fa4d72f02beb39535b288a7e9c1c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}