{
  "manageEntity": {
    "action": "Save",
    "entityId": "284450446",
    "entityType": "Track",
    "nonce": "0x4201f6a9fb5a19f5b9cf8971f43dd02c38bc0beb8c0af6432ada8eed70857151",
    "signature": "0x4cae3906aefcfc11a63438205dff26b0a0ecb52f4cd790cc5438cd70959eb2e80e1ed83d2e6a1a2961be20754b2fd98bb5dce78460784fe0df4612df6898a0c71b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}