{
  "manageEntity": {
    "action": "Save",
    "entityId": "950276646",
    "entityType": "Track",
    "nonce": "0x701f15ed4ccfad4b832e76215fbf0332553e65f7445777b9c7e85400b895a1ac",
    "signature": "0x2442e32014cfc45a7c5769fe2a638dd8d0f99cdb98f97be6d6163be624258ab26c6f69cc23cfc9085cf5eb3249f4e89b5a92950937b43c4c89ec65d6efe7ccf71b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}