{
  "manageEntity": {
    "action": "Save",
    "entityId": "544355866",
    "entityType": "Track",
    "nonce": "0xa44f1f4486bbf6a60414fc33eb426bd52493d1526659dfe8cb25c12ecbdef58a",
    "signature": "0x02a0ac14a1bcdcf5313b64df59d3d17399d356affb0f6484f149831c0ac6cf9c0a97e3f20b8bffe2292aabeb80c0e403c7eaba74bb09a21cb321bee64e3455fd1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}