{
  "manageEntity": {
    "action": "Save",
    "entityId": "623546514",
    "entityType": "Track",
    "nonce": "1787586437761136512",
    "signature": "0x971d849cd4e63eb5d6240c8e62b3706556bbf86ef2040bc57fedccc8cdd1f23d3033312350e9bde76315fbf78d0b2d95d295b288847a74c61f924c79e4b421c51c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}