{
  "manageEntity": {
    "action": "Save",
    "entityId": "815566842",
    "entityType": "Track",
    "nonce": "0xb6dec83f038044613f54692557b36e633df680dfa6a07e59c8a2e00aa3a3cc05",
    "signature": "0xdf060d79ccecce7de5871bca8ee1bccf64ef3a819996f3029cf3785eb1cfd6d17ff6c67725216d48fe0b560ec2963b0e0b8f9a23c78a90daa360c3e684be060d1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}