{
  "manageEntity": {
    "action": "Save",
    "entityId": "265437523",
    "entityType": "Track",
    "nonce": "0x0eeff0dbf5e648534d49e41bce1ab1394ead6808ac5975775a0b816c19403944",
    "signature": "0x01f8e599c9bd376eeafaf1fcf5dee14690053aa1ecd60fe8f5163399ffe4c9a0790c37b35087e84932f72d3df1c7c7969c5a4225ef8f515f36263c133f15f74a1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}