{
  "manageEntity": {
    "action": "Save",
    "entityId": "604110",
    "entityType": "Track",
    "nonce": "0x4dffe8e61c626ec0ed39645ae047dc3f06a3977223d9c9cd6c3f48934e229392",
    "signature": "0x55b6c6d44c2be30bc17262cb3c2b7f34ca218db8ad1d53a9cdde0bef06a36a8d5b9345fd1f53e03eb8f3550061c6c5bde78e69ab2d04a4368aa3beab26b690341b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}