{
  "manageEntity": {
    "action": "Save",
    "entityId": "435204",
    "entityType": "Track",
    "nonce": "0x018d7ea383e6b398c4dd222be20de3f97f53131420468365ee66fac3a72e5e0d",
    "signature": "0x22ddf38fedc000e62c747a8b4c592a33660c7cc58ab06bbd8a851d48587149ab56e0f6f0e601965be3d52707a59b55ec9b65139af1462d666c7a255c4f4fbe2b1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}