{
  "manageEntity": {
    "action": "Save",
    "entityId": "485087",
    "entityType": "Track",
    "nonce": "0xda727f6d1f91fc0e069045e5391656aac5178d99a00fc898bf43e499918825aa",
    "signature": "0x154e9bf178be359dddbf4f56f12621bc7941d3a40658ef360b0bd2a2bd80d63d1df580698abd55d3d754064fcf84073c1e5b2abf9c0275e21390543e5453178a1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}