{
  "manageEntity": {
    "action": "Save",
    "entityId": "1990488648",
    "entityType": "Track",
    "nonce": "0x1c52150653851f314bdec479e242772fa4bc29d349a3ad2c064340115e83a264",
    "signature": "0x78fdca3b9cf4b60c0d75855a332398409d83e7e570dc6dc1f06d8a72980bc6953915687f2bfc031bdb95724088679a6880ad4fb4d0493acca98341bf16e97d811c",
    "signer": "0xd22CADFcf3C70Eda8C00A7cf67dA6709EC60C72e",
    "userId": "806520736"
  }
}