{
  "manageEntity": {
    "action": "Save",
    "entityId": "550572",
    "entityType": "Track",
    "nonce": "0xe5e7f11026532ce1c477643d7152d9bbc4e1a3c6f1bfc09d75244490b89a0ef8",
    "signature": "0x01ab1f4209ebaf9ae9624bc7dcbc565afb46ccc33cd3b0563e2c5f2a4833d31f5ff9296bf9fb56afd495df7acf44dfa9e223aef0ecc321791df22144dab77d3f1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}