{
  "manageEntity": {
    "action": "Save",
    "entityId": "278234566",
    "entityType": "Track",
    "nonce": "0x7030e48c90848946da0565bfd1ca0cf290830e41f14840aa093e4ce92b56d917",
    "signature": "0xbe56d56d0668dca9f998baba7af4938a94c4be5806ffb7d2caea4398335f769660305cb7793e52c3d8e63731f65200ab050f2426c598853917618331f06696b31c",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}