{
  "manageEntity": {
    "action": "Save",
    "entityId": "1830425442",
    "entityType": "Track",
    "nonce": "0x64137527f5b3f8c9fa396c5fc7596099c44d58a6231eb645af15e69538469d8a",
    "signature": "0x4dcd88b5583f6582e8520db2f34959f3669a6afb3c5288a65366a4a77579575434178cc39472e7fb599c762757c93b02d76ff127fe0f2b28210328ec5c74515c1c",
    "signer": "0xbf1f8021D15fDffe83FE44dA0b0c9CE22371359e",
    "userId": "276678878"
  }
}