{
  "manageEntity": {
    "action": "Save",
    "entityId": "544147628",
    "entityType": "Track",
    "nonce": "0x744a076d73c302ef2a46b45c16df0fb3d530df5af3a1bc075e84efd165715170",
    "signature": "0x31bbc35d9385ec2d8f938430d3c1a612560b6c47978c923523d5df8e1beaad2a44368659e1c67cdf4e613d75a1e21c3acb829e690ab54b041729bb95fbb2a9541c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}