{
  "manageEntity": {
    "action": "Save",
    "entityId": "771141606",
    "entityType": "Track",
    "nonce": "0x91fc2a06d17a1647f455d3cdc59ff0db2e12ea62289138e09e1a3ef17d406be4",
    "signature": "0x449f2d52bd17e01c527fb508909c0340c80810d58b5b5543f820ff1ccf6699ec364b8fb39d91fb6100fb0f905e36b764ea1ef0922b207ec01907df9c8be7ef851b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}