{
  "manageEntity": {
    "action": "Save",
    "entityId": "541251",
    "entityType": "Track",
    "nonce": "0x9c49baeae0ec9bb369929637de0e416906cd30a9b63f04db09bc37e7193e0a9f",
    "signature": "0x17ebb078ab799b23d583ddd49b52a0a3c06f1bdd0035f5ef3e2f96ccb7386f1c057eebd0a9af9f501b2262728e41ceac120ac61316bb9828b5e789306ecf60291c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}