{
  "manageEntity": {
    "action": "Save",
    "entityId": "1521870548",
    "entityType": "Track",
    "nonce": "0xb71cc0250ab4b70e922e526366b2f1b5b5ac0dc8eabe84b6a5204d6b333c2203",
    "signature": "0x5e544f3f89b28d5ddd26fb10853be93aebfb28241988eb64e31696be634947ef52d7d7ca2f07379a0e8bf65b7b73a668583d9b6e246801d9f28b14c34946e19f1c",
    "signer": "0x6B239e9B75f27b519de7Bad3a26a0b7d30e32D3f",
    "userId": "311257477"
  }
}