{
  "manageEntity": {
    "action": "Save",
    "entityId": "624626",
    "entityType": "Track",
    "nonce": "0x26eb3d92f43bf9234af5bb85d8ac7ec0a55beb8be55d889296ce816c27b7b040",
    "signature": "0x4d803051038d74b47d79202ad305f0b394602227718cdf99575156b88fd4876a73d454aa1212d099099bb99c3545643ddb600a9cf3e56ac2fde0542e1f0572731c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}