{
  "manageEntity": {
    "action": "Save",
    "entityId": "1515873555",
    "entityType": "Track",
    "nonce": "0x13953956ec9a34c44a3a5b678aa6574301c8bd1ff0e0fe2e9e1382a57fe89544",
    "signature": "0x5ef0bfebf1c7509e84631fe148eaaabb14a12947f50a3720798105d563bc083313ca6ec1519583d0aac1b9d8847b1493ee5c241c418d4f19730bf912f84788421c",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}