{
  "manageEntity": {
    "action": "Save",
    "entityId": "902892959",
    "entityType": "Track",
    "nonce": "0xd8f5f5cb03c80a558f26133ff16dc767ccf34963b404a0fc9c2c7f1d3f23925a",
    "signature": "0x7155c77b4c00d9b6b78a3e2d083e4a4dc3ab7fff3d116b098a662c82a436216b26c5a19d192ae1fb2e5cd76af9907016a7cb21c6545fb18fc70c4d37c858b3b71c",
    "signer": "0x4810fE66B3A42DA4cb34b622aD9A069C293c6b86",
    "userId": "445042807"
  }
}