{
  "manageEntity": {
    "action": "Save",
    "entityId": "185252800",
    "entityType": "Track",
    "nonce": "0x78d638b9e78c937ce7d7ccfb2140f397c69bb60122836e2c0bf4c9c57ac4f31d",
    "signature": "0x392bcfccb7661a7e33382bec7caf25dd68e6eba4e96ef6fcd042f75f107eb22b6a35830ca41967f56e0f92d72508cfc662b7f66e9693ae3e4b3ee77fb913a3401b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}