{
  "manageEntity": {
    "action": "Save",
    "entityId": "888512589",
    "entityType": "Track",
    "nonce": "0xfe5d01bda50ac38650d525a2d5883296e2232feaac01794056033e3078014f7c",
    "signature": "0xe17579363f51cae262f93480737ceb8cf4195eda5458e6ba66fe6edb0dd6bd386cf982cf8934ec5dc1694b443332fa02cd1e0f396a81f2c8b9694ba0769d82901b",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}