{
  "manageEntity": {
    "action": "Save",
    "entityId": "966168852",
    "entityType": "Track",
    "nonce": "0xd445c13fffdedac60fb65d0536f8d348e65698b18800a3184f15fb37a4e6d0ac",
    "signature": "0xc2d5ae6a791f1be2e6d0f91c84deef575b0b3b079c2a7f4e94e2d0683f7a86993407febb3cede58c46f34ebc24c64a47379125a3b802e159cf57ad5b6ec3b4d61b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}