{
  "manageEntity": {
    "action": "Save",
    "entityId": "661858474",
    "entityType": "Track",
    "nonce": "0xd2ee53d5861c19976c3d062d3ccec5dc1e6d37e7c31bc42333de37358fd21488",
    "signature": "0xdc3f89f75b224819429d9ba096ca5511d5946d6c3209dba4d2c190c30f01f31e4c00101e0dba9a1d45637ddc7f22d425831deac81e381b4e3f1be8d162bff3b31b",
    "signer": "0x0a5148A3f132E6696c1Cd3FDA8465fC5fF17d3D2",
    "userId": "803288761"
  }
}