{
  "manageEntity": {
    "action": "Save",
    "entityId": "974986388",
    "entityType": "Track",
    "nonce": "0xd7919dd7d26f86283dbcbb94902eb87c725a1cfd0666923d8716d5396e792679",
    "signature": "0x4cf6e90f9c03660a5d9481d7a7bb8efc792c68b7af5a1cee957bc401b1ef6c7803ca7ff5f79193c6c9e22f39c8bb4a8bed5f4291c1464126091d5f313dc5f4b31b",
    "signer": "0x26Feee0AaDc0e2d8f7aBEd5cdb0bCD7D325F618d",
    "userId": "354535"
  }
}