{
  "manageEntity": {
    "action": "Save",
    "entityId": "1473551373",
    "entityType": "Track",
    "nonce": "0x1b95070e397a62ee2e814516e6cd64f0446a23afd71d02b829bef1f594b30cb7",
    "signature": "0x258cfd6c3e971946239417a47f15d18283bc072148a3c027a6391f8e476d73cc102683d9de810fb2c5065bb328b29e53da080c6ee38f5def43478d8370e052131c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}