{
  "manageEntity": {
    "action": "Save",
    "entityId": "988512",
    "entityType": "Track",
    "nonce": "0x375ee0c1942038be30deb2931d2a847d9e05be4717865a8696c26b6ab03f57a8",
    "signature": "0x4bc4049454849aad3b0163e28a3fdc3569e693e0f0b6169cbcc6612f6858f4592166fe1d4429d1fc650f5b1d3cbd1db9c1903db1f7554acc767f1469f7fd7af31b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}