{
  "manageEntity": {
    "action": "Save",
    "entityId": "358392140",
    "entityType": "Track",
    "nonce": "0x1b066f19219465fbecbc61cc0108cf28c1c9490b971cb4ca2ea817cd7d722b71",
    "signature": "0xc8ce44e4b0d9422b296fe960083098b9f92843518a34f2247ba35992caf5393d56966bd2e0dab2d06cf52fc3fed6b7cf52175febd09f425b0141886e0f3076891b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}