{
  "manageEntity": {
    "action": "Save",
    "entityId": "499441481",
    "entityType": "Track",
    "nonce": "0x49f4148383f6f25a3ea1c1f72eee98c3d5bd13fa5f5545f521d8fe284fd503a4",
    "signature": "0xf6ca1bec2dc6614e4e2b761a29ac5a6a50e584e3510d92c41afcce8492a2352e6a1e6878595d3a1f2a110f288fda91320d6fde50562ecec3dac935425357caba1c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}