{
  "manageEntity": {
    "action": "Save",
    "entityId": "1472018752",
    "entityType": "Track",
    "nonce": "0x0ebcb1a2508156c6dc6569c62b44d7bb00c9d8bac2bec2ec7b3057199e956d3b",
    "signature": "0x2e1bb49307074c013b2c5e35c0c3174a55da199b309ca4877d25789b6c30cc9d15550bbadfbf08e8f8b3c9d6a1d2184c366689cec4fae7cfd3e07bd4b3a6e4b21c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}