{
  "manageEntity": {
    "action": "Save",
    "entityId": "440012",
    "entityType": "Track",
    "nonce": "0x43568ddea62934634ff199d4544fdf63b1e58c72afdf414a12e95ca8a7932a68",
    "signature": "0x6556163165ecf32b376a5b38e53e74aa954ca0681cd4beef4b738c0dcfed11e775fb8252b814aa686d9f2df4738a2e808bec51db3f80be0684c1c13cc60ae0d51b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}