{
  "manageEntity": {
    "action": "Save",
    "entityId": "1000042964",
    "entityType": "Track",
    "nonce": "0xd67c0a6d7b99b2337ff9a3c810a4dbb546176034ab939ac39ec08416ed7ec00a",
    "signature": "0xbd1567d9a7f60cc89772fd238a52d1f96032cac4b395823164e7e4a7fe3131a571ea68fac42796c4af5c90633302bce8bf75f048ad3ffbb05d22f3295d6fda721c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}