{
  "manageEntity": {
    "action": "Save",
    "entityId": "425627072",
    "entityType": "Track",
    "nonce": "0xbc5a8d67fbc1b944f1100f87f3008fe24ece4ac9493058d70af018651c2c7eb1",
    "signature": "0xea90cc2b3471248ff13e54245a7d810e4f9bee5fb72c752e0813ee8d24abbfc72047efef2a10d5e8e1c65aa39f66955e192f5ec41f19b8d1e52c847b01b9fd8e1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}