{
  "manageEntity": {
    "action": "Save",
    "entityId": "1532509140",
    "entityType": "Track",
    "nonce": "0xe741639cd13d306e8cfbd4e2863b08932c3d863dd6ffaba53fe80c4e99f9f813",
    "signature": "0x571768f6c5d46a685a101a2686626c6cd84260c776a9b480c94aa073e862b551363c7b225acc0277384cb7c71aa9cb140c8f2d6e8f5be9fc01f733bb00565dac1c",
    "signer": "0x7e1F8Ad5AC71ff7ECFaaB54D7C2Ca8C373DeD528",
    "userId": "674981811"
  }
}