{
  "manageEntity": {
    "action": "Save",
    "entityId": "1437923772",
    "entityType": "Track",
    "nonce": "0xf1f0cb6c1e5b47099d91ec161b6ba2357ef9d6ed619955d26bf0cea76d6491ea",
    "signature": "0xe61abd6051bb095e75d6fa75f8a0a9a2234e605f16956112b03e56a31fcdcf894254321d01931abb97313a3169dbb44130a33f1c5af95a44de4437a4497856ae1b",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}