{
  "manageEntity": {
    "action": "Save",
    "entityId": "754946465",
    "entityType": "Track",
    "nonce": "0xa73a6e0bbb2a9d1c27d857486e9751a0bbb27f03c195f2cd5261b194122abd90",
    "signature": "0xf84f9245ecef4b60604855b2e48e9b69cef997f996a8f8bf0b3d59d71d8151cc792385e445ab3c7728c6bd206556973d726514a1825a258d1a0cf0a868b2596c1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}