{
  "manageEntity": {
    "action": "Save",
    "entityId": "771854544",
    "entityType": "Track",
    "nonce": "0xa8832e1feecf6ac212618838deb4c2b971b50e3c504e479bb6f558b3778656c0",
    "signature": "0xcbaa80dab4d680f4fd55e446c698855a29065d4696f06f82a41d801577e407e13419a194861a9e83f1a6f652d736248c2e40b92f97b25ca3dbe6df869711d4601c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}