{
  "manageEntity": {
    "action": "Save",
    "entityId": "375239",
    "entityType": "Track",
    "nonce": "0x5c9d4fe1c47a7bef771a18b5122e7fcd2ed50b466352184263f4df1bb7cc9e7a",
    "signature": "0x6d56209700d2d80b9d2d93b7864144af2bd241b9d49197aa3025ada511a6c143201ab7dd05140525bd17c8fd013d2356122488d100414dc83ba202c872026bd01b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}