{
  "manageEntity": {
    "action": "Save",
    "entityId": "456150458",
    "entityType": "Track",
    "nonce": "0x207a2aca1499aaab04b0a40794e5d8f3b057ca18b62074acfc3bcc92be33e885",
    "signature": "0x8022d5165560c367a09d251dab5617d2e3ac01dc0f4800f0e91c88a38de5e0b85de059fd6505a88daabf7e4a40fda301b8af7650d1ee8d2dfc45a613cefd2f1c1b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}